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Geotechnics - Science topic

Explore the latest questions and answers in Geotechnics, and find Geotechnics experts.
Questions related to Geotechnics
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  1. Concrete is the heart of civil engineers, as it plays a crucial role in binding materials properly. Nowadays construction costs are very high due to the scarcity or unavailability of natural resources. This problem can be resolved by the replacement of concrete with a different material that is not conventional in terms of required properties. From previous scientists' research, cement, sand, and metal are replaced by using different artificial materials.
  2. I wonder what other new materials can as binding to reduce cement or concrete?
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In my opinion, when choosing a paving technology, it is necessary to use a life cycle analysis and make decisions based on the total cost, including not only construction costs, but also maintenance, renovation costs and socio-economic costs for users.
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I am currently a 3rd year Civil Engineering Undergraduate. I have a particular interest in the Geotechnical discipline, which I have come to learn that a good base of report writing skills are needed to convey your designs. Not to mention the various types of reports which I would needed to become familiar with.
Would anyone have any text books or courses they would recommend to improve my grammatical and writing skills, perhaps specifically catered towards Civil/Geotechnical Engineering Reports? I am taking this opportunity to prepare for both my thesis project next year and my future career.
Thank you everyone for your help in advance. Any advice will be highly appreciated.
Wil
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Dear Student,
You should take Academic writing courses from SWAYAM, NPTEL, it will not only improve your technical writing skills but also the certificate will add to your academic credit.
Academic Writing
By Dr Ajay Semalty
Effective Writing
By Prof. Binod Mishra  
Academic & Research Report Writing
By Dr. Samir Roy
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Glacial lake boundary susceptibility to failure is a geotechnical aspect.
What are the approaches taken for geotechnical modelling of moraine dams/rock dams/ice dams and surrounding rock/moraine failure that can profoundly contribute towards initiation of GLOF!
Approaches to model possible debris flow associated with GLOF!
Surrounding rock/moraine/ice structure that could fail and fall into the reservoir of a glacial lake can also initiate GLOF, or sometime without failure of lake boundary, splashing out waves as a result of the failed mass into the lake can create havoc downstream.
Available or intended research approaches towards consideration of these geotechnical aspects and modelling of the strength/stress conditions of lake vicinity in view of glacial lake hazard is aim of this discussion.
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thank you Claudio Oggeri
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Dear all, is anyone aware of any ´´large´´ open database of soil geotechnical properties? I would like to use them for machine learning purposes
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Dear Jose,
I am not familiar with a general database, but here you can find a liquefaction-related database:
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Geotechnical engineering trivia
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The A-line in the plasticity chart is named after Arthur Casagrande, who worked extensively on plasticity of soils and developed this chart
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Dear colleagues
I have a question:
In interface shear studies between sand and structures such as geosynthetics or CFRP , how we can calculate or achieve initial relative density for internal and interface friction angles at critical state?
Based on which ASTM, or through which experiments.
Please let me know if you have an answer about this question.
Thank you for your kind responses.
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It is stress dependent at relativly very low stress level
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I want to get information about world-class universities, especially in the fields of geotechnical engineering and tunneling. Therefore, the following questions arise:
Which universities and in what research topics are the best at present?
What are the reasons for choosing them?
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Colorado School of Mines
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I would like to benefit from your academic and research experiences in the field of civil engineering. I would like to study a master's and doctorate degree in geotechnical engineering. Is this specialization recommended for the future from an academic and research point of view, and is there a specialty within the field of civil engineering that is recommended or preferred to study a master’s and a doctorate in it?
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soil structure interaction
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This topic is created to be a place for sharing reliable open-sources that contain quality free courses, webinars and short educational videos in the field of geotechnical engineering.
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Zew Zealand Geomechanics Society Recorded Webinars.
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i wanted to know the recent trending research interests in the field of Geotechnical engineering
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Hi Shad!
It could be some topic about analysis of off-shore structures foundations and studies of rock fracture in geothermal exploitation.
I hope that it helps you🙂
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I simulated a pile embedded in sand soil. The pile was subjected to lateral and vertical forces. The model was aborted. I have printed the "Job Diagnostic" to present the causes of the aborted model. The problem occurred because of the nodes at the contact surfaces between the soil and pile. Some nodes were overclosure, and others separated, as presented in the figure below. How can I solve this problem?
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Good afternoon! If the model solution stops, it is desirable to check the boundary conditions, it is also possible to increase the size of the computational grid. The pile is usually monolithic and the moment of inertia is evenly distributed.
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Bit of background… Geotechnical engineering in mining focus on broader classification (RQD, Q, RMR etc). The makeup of rocks grouped in these classifications and other classes like lithology can vary significantly. For example, some data I’ve looked has a range of 40% iron content for an individual lithology. I would expect something like iron influence rock mass strength, an influence which would be masked if not lost, when relating the broader categories to excavation performance.
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All of the points listed above can be applied also to underground mining works with some adaptations to the individual stoping designs and types of mineral deposits
HGD
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When we apply soil improvement by using rigid columns, like deepsoil mixing, jet grout, stone columns, geopiers..etc., we normally place a load transfer platform by using a granular material. Is there a minimum soil thickness to prevent soil arching to form or does soil arching actually occur?
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Dear Ahmed,
There always exist a shear stress between moving and stationary soil masses due to relative displacement. Localized displacement causes arching. Change of soil strength as well as soil plasticity also the reason of soil arching.
If a statically admissible stress field is
provided support then there will be less failure due to arching.
If the work rate of external load acting on the soil exceeds the rate of internal work rate then arching will not occur.
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For example it is common that curve of (v) against (ln p) will be plot. Why don't we use e instead of v?
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The reason is the one described by Pedro Miguel Vaz Ferreira above. The specific volume is linked to total volumes and definition of volumetric strain is then straightforward. No effect on the CSSM parameters, other than that
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I'm willing to prepare a loess ( collapsible) soil in order to test it's collapse potential in accordance to the ASTM Standards.
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Nice question . Why dont you add different proportions of expanding clays ( smectites ) to see the effect ...
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In a geotechnical laboratory which instrument can be used for determining soil CEC and what is the approach?
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Dear Mehran,
Methylene blue adsorption test (MBAT) (Cokca and Birand,1993) is amongst the methods that can be utilized to determine the CEC of clay particles. Below are the given references where the details of the method can be found.
References:
1. Cokca, E., & Birand, A. (1993). Determination of cation exchange capacity of clayey soils by the methylene blue test. Geotechnical Testing Journal, 16(4), 518-524.
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Which is the best Finite Element software for the design and analysis of Piles in geotechnical engineering on parameters like ease of use and accuracy out of Ansys, Abaqus, Plaxis and Midas GTX, for research purposes?
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I think Plaxis 3D is suitable software
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Lattice Boltzmann methods in geotechnical engineering, compare with SPH, MPM, VOF when modeling fluids?
For free surface problems, or the fluid in porous media, which one is more accurate or efficient?
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Undoubtedly, LBM excels because of its advantages and acceptable performance.
My recommendation is to refer to this article:
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I would prefer experimental findings, not conclusions such as the fact that it is above 1 and can conservatively be taken as 1.
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This is a good question.
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In Plaxis 3D, I have modelled a quai front consisting of cellular sheet pile walls as a continuous plate with interfaces. How can you find the interlock strength of such a construction? In theory the maximum interlock strength will occur at 67% of its height but this has not occurred where i try to find the results from the output.
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That is a good question.
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Hello there,
I am looking for a geotechnical design software which has the capacity to model FRP composite sheet pile wall for shoreline protection. I would appreciate any suggestion you can provide.
Thank you.
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Hello, find the softwares like PLAXIS3D, FLAC3D and also ABAQUS are useful for simulating your problem..ok all the best in your research..
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The application of Machine Learning (ML) is rising day by day in all fields of studies. As a geotechnical engineering enthusiast, I want to know what are the most widely used ML algorithms (based on various python libraries and R packages) that can be used to improve the state-of-the-art practices in geotechnical engineering. Moreover, what are (/ can be) some of the most key applications of ML in geotechnical engineering research and application? It would be great if someone can suggest some key skills regarding ML/Deep learning/Programming for a young researcher in geotechnical engineering field. Thank you.
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The machine-learning algorithm could deal with Regression and Classification work. in research of traditional civil engineering, lots of prediction models are established to handle the various problems. Therefore, the machine-learning algorithm or data mining methods provide a new strategy to establish the mentioned above models. for example, the landslide displacement prediction, is also one of my research interests. the inducing factors of the landslide could be regarded as features in ML theory, and the landslide displacement also is regarded as labels. the consequent thing is to use different ML algorithms to train the model and other data to evaluate the accuracy of the prediction model. the svm, bpnn, rf and elm ML algorithms are widely used in Civil Engineering. with the development of Deep Learning, LSTM, CNN and other improve Deep learning algorithms are utilized to handle the prediction issue of big data. the sklearn module of Pythone is the best tool to establish ML models from my view.
by the way, I think that ML is just a tool to solve the problem and the analysis of failure or deformation mechanism is the most important.
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As we know, R-square is the measure of variability in the response variable due to the regressor variables. I got the value from 20% to 30%. I am here to know that what is the minimum expected R-square value in geotechnical engineering?
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In my opinion, R2 is not enough to judge the accuracy of a prediction. It should be supported by more performance indexes. Because R2 gives high values even if so many wrong predictions when the error is regular on positive and negative sides. For example mean absolute error, mean absolute relative error may be used as an alternative.
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We have been working on :
Draft review about the Triaxial equipment .
I am looking for a collaboration of an expert in the topics related to this work. For authorship that will make my draft into a final paper.
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Please have look on our(Eminent Biosciences (EMBS)) collaborations.. and let me know if interested to associate with us
Our recent publications In collaborations with industries and academia in India and world wide.
EMBS publication In association with Universidad Tecnológica Metropolitana, Santiago, Chile. Publication Link: https://pubmed.ncbi.nlm.nih.gov/33397265/
EMBS publication In association with Moscow State University , Russia. Publication Link: https://pubmed.ncbi.nlm.nih.gov/32967475/
EMBS publication In association with Icahn Institute of Genomics and Multiscale Biology,, Mount Sinai Health System, Manhattan, NY, USA. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/29199918
EMBS publication In association with University of Missouri, St. Louis, MO, USA. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/30457050
EMBS publication In association with Virginia Commonwealth University, Richmond, Virginia, USA. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/27852211
EMBS publication In association with ICMR- NIN(National Institute of Nutrition), Hyderabad Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/23030611
EMBS publication In association with University of Minnesota Duluth, Duluth MN 55811 USA. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/27852211
EMBS publication In association with University of Yaounde I, PO Box 812, Yaoundé, Cameroon. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/30950335
EMBS publication In association with Federal University of Paraíba, João Pessoa, PB, Brazil. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/30693065
Eminent Biosciences(EMBS) and University of Yaoundé I, Yaoundé, Cameroon. Publication Link: https://pubmed.ncbi.nlm.nih.gov/31210847/
Eminent Biosciences(EMBS) and University of the Basque Country UPV/EHU, 48080, Leioa, Spain. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/27852204
Eminent Biosciences(EMBS) and King Saud University, Riyadh, Saudi Arabia. Publication Link: http://www.eurekaselect.com/135585
Eminent Biosciences(EMBS) and NIPER , Hyderabad, India. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/29053759
Eminent Biosciences(EMBS) and Alagappa University, Tamil Nadu, India. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/30950335
Eminent Biosciences(EMBS) and Jawaharlal Nehru Technological University, Hyderabad , India. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/28472910
Eminent Biosciences(EMBS) and C.S.I.R – CRISAT, Karaikudi, Tamil Nadu, India. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/30237676
Eminent Biosciences(EMBS) and Karpagam academy of higher education, Eachinary, Coimbatore , Tamil Nadu, India. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/30237672
Eminent Biosciences(EMBS) and Ballets Olaeta Kalea, 4, 48014 Bilbao, Bizkaia, Spain. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/29199918
Eminent Biosciences(EMBS) and Hospital for Genetic Diseases, Osmania University, Hyderabad - 500 016, Telangana, India. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/28472910
Eminent Biosciences(EMBS) and School of Ocean Science and Technology, Kerala University of Fisheries and Ocean Studies, Panangad-682 506, Cochin, India. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/27964704
Eminent Biosciences(EMBS) and CODEWEL Nireekshana-ACET, Hyderabad, Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/26770024
Eminent Biosciences(EMBS) and Bharathiyar University, Coimbatore-641046, Tamilnadu, India. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/27919211
Eminent Biosciences(EMBS) and LPU University, Phagwara, Punjab, India. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/31030499
Eminent Biosciences(EMBS) and Department of Bioinformatics, Kerala University, Kerala. Publication Link: http://www.eurekaselect.com/135585
Eminent Biosciences(EMBS) and Gandhi Medical College and Osmania Medical College, Hyderabad 500 038, India. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/27450915
Eminent Biosciences(EMBS) and National College (Affiliated to Bharathidasan University), Tiruchirapalli, 620 001 Tamil Nadu, India. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/27266485
Eminent Biosciences(EMBS) and University of Calicut - 673635, Kerala, India. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/23030611
Eminent Biosciences(EMBS) and NIPER, Hyderabad, India. ) Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/29053759
Eminent Biosciences(EMBS) and King George's Medical University, (Erstwhile C.S.M. Medical University), Lucknow-226 003, India. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/25579575
Eminent Biosciences(EMBS) and School of Chemical & Biotechnology, SASTRA University, Thanjavur, India Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/25579569
Eminent Biosciences(EMBS) and Safi center for scientific research, Malappuram, Kerala, India. Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/30237672
Eminent Biosciences(EMBS) and Dept of Genetics, Osmania University, Hyderabad Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/25248957
EMBS publication In association with Institute of Genetics and Hospital for Genetic Diseases, Osmania University, Hyderabad Publication Link: https://www.ncbi.nlm.nih.gov/pubmed/26229292
Sincerely,
Dr. Anuraj Nayarisseri
Principal Scientist & Director,
Eminent Biosciences.
Mob :+91 97522 95342
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  • What are the good research Areas/topics in geotechnical engineering/Geoenvironmental Engineering for Ph.D.?
  • Can anyone suggest to me research topics related to recent Sustainable and Green Approaches in Geotechnical and Geoenvironmental Engineering
  • Kindly suggest me a good review article regarding the studies performed in geotechnical engineering related to sustainable development.
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Hello..first of all congratulate you for thinking to select the socio economic relevant Ph.D topic. Kerala has faced serious threat on landslide in the recent past and so topic on landslide would be useful for you.
The important issue on today due to urbanization, the extension of infrastructure development in horizontal is difficult so only vertical is possible..think of new kind of foundation supporting system for high rise building.
Another very important activities in a typical urban environment such as ground movements due to various man made activities like deep excavation for new construction, metro tunnel, embankment or earthquake..the stability of an existing structures closer to these activities are questionable and need research for safeguarding the existing structure due to urbanization..
Geoenvironmental point of view the main issue on today is how to dispose the corona based various medical relevant waste?..mostly they are trying to dispose on the ground by simply dumping into the ground. There are serious concerns on contamination of the ground due to disposing corona based tools in ground.
The waste materials as produced from many industries are disposing on or into the ground..when these waste are interacting with water and the ground, the ground gets contaminated and need proper guideline design for safe disposal of all industries based waste..you can think many topics like this but need to select on one such social relevant topic and collect literature on the chosen field..you are most welcome for any support on your study..ok all the best in your research..
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I am currently building a density model of SOILS, conventional approaches use the relationship of Vp with density through Gardners Eq, however, within soils this does not provide a strong relationship. I have access to a lot of geotechnical data such as CPT results, any ideas?
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Dear Benedict, in a recent study we tried to predict density using electrical resistivity. I think you might be interested in the results.
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LBM, SPH, MPM, and PFEM, which one is better for fluid simulation in geotechnics? (free surface and coupled engineerings)
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In my opinion, it depends on many factors such as complexity of geometry, fluid characteristics, fluid diversities, fluid contact with boundaries, adding different Multiphysics and heat transfer modules! Moreover, time is also another important factor that you need to consider.
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Dear Researchers,
The modulus of subgrade reaction is widely used in the Winkler beam method on an elastic foundation. The most reliable estimation is given by Bowles [1996] as it takes into account the dimensions of the foundation as 40*qu (for around 2.5cm). This subgrade modulus value is it the same for static and seismic conditions?
As far as I understand, since qu is the ultimate bearing capacity, the subgrade value is equal in both states (static and seismic).
What are your views regarding these?
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The elastic media of the soil is represented by a mechanical model, a mathematical model, and a numerical model. The Winkler model is a mechanical model that uses a system of multiple independent linear springs to model the soil. Nevertheless, the Winkler limitations are as follows:
1-the springs are not connected, lack of continuity between the springs, therefore we get no deformation beyond the loading regions.
2- The spring are considered as linear, but the bearing soils is not linear
3- the equal amount of settlement.
It will be better to use non-linear models: Chandra (1979), Boussineq (1985), or an Orthotropic Elastic continuum model (Vlazov model).
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Hi researchers
Im trying to model dense sand which has peak friction angle and constant volume friction angle . As you k now if we plot shear stress - shear displacement(strain) of dense sand till reaching specific displacement curve ascends to the peak point(peak friction angle)and after that with slight reduction becomes constant(constant volume or residual friction angle). I wanna model the behaviour of soil accurately so my purpose is to define friction angle as a function of shear displacement. I searched and understood using SUBROUTINE (specially USDFLD) may help me but I have not work with subroutines at all and this is my first time however I linked vs code and intel R with abaqus and its completely ready for working.
I will be thankful to hear your helps and advises.
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Thank you so much dear chen, could you please guide me more about fist way( using field variable in abaqus) or suggest me any video or article related to this title?
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Please share your experiences on the use of Ansys and CivilFEM in geotechnical modelling. The advantages or disadvantages compared to the other FEM software.
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I think Ansys is more suitable for geotechnical engineering modeling. It has a very powerful meshing function, but I only use it for modeling and other finite element software for analysis.
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The purpose of this discussion is to find out if the AI and ML techniques are being used practically in geotechnical projects or their applications are still limited to academic studies. If they have been accepted as reliable design approaches, has any standard been developed for systematic application of these techniques?
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Muhammad Nouman Amjad Raja Thanks for your helpful contribution to the discussion.
That's right, one of the major challenges in this area is the lack of reliable data in large scale. However, from my industry engagement experience, I can say that the data is available but the main issue is the lack of effective collaboration/communicate between universities and industry to use these value databases for AI/ML studies/analyses, which by itself could be another important topic for discussion.
I believe the Geotech industry should be well educated through simplified manuals and design methods to learn how to use AI and ML approaches in practice and also be able to review/verify the designs that have been done based on these techniques.
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I would like to perform tests on triaxial equipment, So l need Geotechnical lab who receive foreign students.
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You may enquire from Civil Engg./ Earth Sc. Depts. of various Indian Institutes of Technology (IITs) and National Institutes of Technology (NITs) by way of accessing their respective websites. Further, You may also contact through some private GT Labs. (e.g. Soiltech, Pune, India).
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There is a particular construction that has a set of bored pile foundations on site. Some of them have voids as verified in the field pile test... One of the options is jet grout.
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For weathered rock, you can use the triple fluid system (water jet surrounded by an air jet, with a separate grout port).
Good luck!
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Geotechnical applications
Soil improvement
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The following article might help you:
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Can I find a book or research that involves this topic?
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Best advice is to ask the technician and lab manager of the accredited test authority you use. Text books are needed too, but there are limitations on what can be expected from standard tests.
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1. Lightweight materials
2. Reducing stress on weak soil and underground utilities
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It seems that all these methods could model fluid, solid and gas naturally. I am wondering which one should I learn for the application in geotechnical engineering (from aspects of learning curve, prospect, mechanism). Any suggestions will be greatly appreciated.
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SPH is suitable to model fluid flow in large-deformation problems. The drawbacks of the method are:
  • Requires special boundary treatment approaches, such as use of ghost nodes.
  • Exhibits spatial instabilities, as a consequence of the pointwise integration.
  • Insufficient neighbouring particles cause inconsistencies.
  • Computationally expensive as a result of the search for the neighbouring particles.
  • Suffers from tensile instability, which causes numerical fracture.
PFEM is suitable for large-deformation problem with fluid–solid coupling, including modelling free-surface evolution. The drawbacks of the method are:
  • Contact between solid–solid nodes and solid–fluid nodes require special treatment.
  • Large deformation requires frequent re-meshing.
MPM is suitable to simulate large-deformation problems without mesh distortion problems, including fluid–solid interactions in large-deformation problems. The drawbacks of the method are:
  • Use of linear shape functions in large-deformation problems causes numerical errors due to material points crossing grids called the cell crossing noise.
  • Higher dimensional shape functions require greater computational time.
Available MPM codes for geotechnical analysis:
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Dear all,
I have experience in DEM with Trubal code, and I am wondering mastering PFC 3D to use it in my future research studies (in the area of geotechnical engineering or industrial processes). How should I start? I mean, what are the best resources on PFC 3D?
Thank you in advance,
Ahmad
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When you have installed this software and have the license, you can read the tutorial in the PFC help, which provides some cases from simple to complex models in the simulation. By practicing these cases, you can handle the basic skills and start your simulation using PFC.
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Hello,
I'm working on a geotechnical problem of a submerged foundation from a total stress analysis point of view. Since I need to calculate the rate of work of all external forces conjugated to my problem, does it make sense to adopt Archimede's principle of buoyant forces as an external force of the problem?
I'm aware that the effective stress principle is in total agreement with Archimede's principle, so if I adopt the buoyancy force for the total stress analysis, in an effective stress analysis can I disregard it?
Thanks in advance,
Mateus Forcelini
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The upward buoyance force should be considered as the external force to act on the immersed object you are dealing with. The effective stress analysis of soils need be considered for the geotechnical resistance, displacement magnitude and rate.
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As a function of dimensions of real projects?
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Feel free to get in touch with me for more explanation.
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Hey guys,
I am attempting to model the installation of a helical pile into sand using Abaqus CAE (explicit). I am using a CEL model with a rigid pile and Eulerian sand part.
Every time I run the job, the sand part 'explodes' and has very large deformations. I have attempted to rectify this problem via the following trials:
-assigning cohesion to the sand;
-applying a pressure to the sand;
-beginning the installation with the pile already penetrated into the sand part.
Through an exhaustive trial-and-error process, I found that I have solved the exploding sand problem by changing the 'hard' normal contact interaction to a 'linear' contact interaction. However now, the history outputs show no plasticity/plastic deformation! This is kindof important as I am interested in finding the installation disturbance effects of screw-pile installation.
Is anyone aware of what I can do to accurately/realistically model the installation disturbance effects of a screw-pile being installed into sand? I am happy to provide any more information as needed.
Thanks!
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Dear @Harrison stamoudis,
You can assume a cohesion of 0.01kPa for sand as an aparent cohesion.
Feel free to get in touch with me.
Cheers,
Ali Ahmadi
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What are the geotechnical parameters that affect the performance of the box culvert for the Rod Under Bridge (RUB) design?
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Geological 3D modelling is becoming increasingly popular and every now and then there are articles about voxel based geological 3D models (e.g. )
While "classical" geological 3D models often consist of discrete surfaces that separate volumes of "homogeneous geology" from one another, in a 3D voxel model each voxel can contain different values and therefore 3D variability of ground properties can be represented. My question is if there are any approaches that deal with geotechnical 3D stability assessment of voxel based underground models?
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Dear Bryant Andrew Robbins, Muhammad Usman Arshid and
N. Bar
, thank you for your answers and I was not aware of these methods and software packages!
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I am a master degree candidate in Mining Engineering. I am interested in rock mechanic and geotechnical area of study in mining, which will be highly in demand in the future. any suggestions would be appreciated.
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The field of rock "bursting" in deep underground mines could use more research.
When this phenomenon occurred about 1.5 km below surface there were no experts to suggest improvements and the mine I used to work for had to be abandoned.
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Please see figure 11
"Seismic site effects in the central zone of Monterrey Metropolitan Area (northeast Mexico) from a geotechnical multidisciplinary assessment" (Bull Eng Geol Environ (2019) 78:48 )
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Thanks, Mohamad M Hilal and Thomas Makedon for the informative input. My question is still there that how can I draw the plot using elevation and distance (km) in values. I have also attached the image.
Thanks a lot
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I have four samples from the same site but different depths at equal intervals(0.5,1.0,1.5 and 2.0meters), I have conducted some geotechnical properties test on them but I now have very few samples for (1.0,1.5,2.0) but for 0.5m I have enough such that I have performed all the needed tests now I want to estimate the ones I couldn't perform due to insufficient samples. For 1.0,1.5 and 2.0 I have obtained their particle size distributions, liquid limits, plastic limits, shrinkage limits, natural moisture contents, specific gravities, volumetric swell. I want to know if there is any professional way of estimating/predicting the OMC,MDD,CBR value, Compression index, coefficient of consolidation and the coefficient of permeability?
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Dear Colleague
Approximate values for some of the required soil properties, like soil compressibility, can be estimated using numerous empirical correlation equations to obtain preliminary evaluations. It is important to know the reliability of these equations before using them. The group of equations that proposed to all soils are recommended. Some of these equations are attached.
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I want to introduce my manuscript to journal which is not take fee on publishing.
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....also Acta Geotechnica, as well as Acta Geotechnica Slovenica
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Dear colleagues!
What is the best method to determine In SItu Block Size Distribution if I have orientation, spacing and persistence data collected from 3D Point Cloud?
I considered using 3DEC but I am not very fluent in the software.
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Hi Friend
I think you use the Rmi classified to detemine Vb.
Thanks
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I am planning of furthering my career by doing a PhD in Mining engineering, most likely in 2021 or early 2022. My areas of interest are Rock Mechanics and mining geotechnical. I am not too sure about the topic that I chose. Is this topic still interesting enough for now?
or are there any suggestions for other topics that are more interesting?
as well as university recommendations for me to take my doctoral programe ?
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In underground mines the stability aspect of the infrastructure and of the mining process itself will always be relevant. Obtaining methods or techniques of self-support or support through external elements under a minimum cost scheme is one of the fundamental aspects for the technical and economic viability of the exploitation of an underground mining deposit. Mines that have suffered collapse in some of their areas have experienced great losses due to stoppage of their operations, loss of equipment and in some cases of people, therefore it is an issue that continues to be valid. Something similar happens in open pit or surface mines. The equilibrium slope must be maintained to ensure that the slope is stable. A steep slope allows for greater stability, but is too expensive. On the other hand, a slope with a steeper incline is more economical but reduces its safety factor. It is necessary to find the optimal inclination that allows the company to generate maximum profitability without affecting safety. Finally I could tell you that it is a very good topic for your thesis. Cheers
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When calculating consolidation settlement under structure loads, it is recommended to use the net foundation stress (net foundation stress= stress of the structure - the stress of the excavated soil). For a normally consolidated soil, how is this assumption correct?
For example, if the structure loads are around 300 kPa, considering the excavated soils, the net stress is around 40 kPa. The settlement caused by 40 kPa is not significant.
My concern is, the excavated area consisted of soil materials, the newly introduced elements are different from soil materials and thus, settlement should be calculated by ignoring the excavated portions. Unless, the soil profile changes, which in that case, settlement will be evaluated considering the existing condition.
#consolidation #geotechnical #settlement
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You said " Now you are applying structural load. So any settlement that happens is predominantly because of the structural load alone even though you back fill it with excavated soil" this means that, after considering the soil as NC, the structural load will be the one causing the settlements , ignoring the weight of the excavated soil, right?
Your explanations are good. Thank you.
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There are three primary areas of ground movement towards a pressurised TBM: at the face, along the shield skin and at the tail void -(In the attached figure).
Can the maximum surface Settelment of the tunnel Longitudinal Cross section due to the displacement of the tunnel face can be added with the Transverse cross-section surface Settelment and introduced as the final surface Settelment? in 2D model-numerical method.?
But in the transverse two-dimensional method, we cannot get Settlements dou to face pressure induced by tunnel advanc.
I was going to get the Settlements dou to face pressure from the longitudinal 2D model and add it to the other Settlements Caused by other factors
In the longitudinal section of the tunnel, details and geometries and conditions have been implemented so that only the displacement caused by the face pressure is created and that the shield cone and mortar injection and consolidation are not modeled.
so only max surface settelment in longitudinal cross cestion is occurred due to face pressure It is capable of adding with max surface settelment in transverse cross sestion due to injection pressure and shield cone?
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I simulated the shield driven-tunnel by FLAC 2D, in which step of numerical model must be applying the traffic loads of ground surface (20 Kpa)? the traffic loads of ground surface change along day and night
@steps:
1. elastic initial equilibrium.
2. elastic-plastic initial equilibrium.
3. Simultaneous with excavation and pre-installation lining.
*in which step influence the traffic loads is real? (interaction with ground above tunnel)
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I have found the hyperbolic parameters (K and n) according to Duncan and Chang model. However, I have no idea how to fit a hyperbolic model into a failure envelope to get the friction angle.
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Hello,
some suggestions can be found at the link:
Take into account that strength parameters should be selected according to the applied stress path, resulting from the loading sequence.
Regards
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Machine learning has proven to be very successfull in many disciplines and the general development is surely furthered by openly accesible algorithms and datasets for the whole community to work with. In geotechnics however, there are very few open datasets that could be used as benchmarks which possibly hinderes the development of ML in our field.
This is why I am currently looking for big open datasets related to geotechnics or engineering geology. Ideally the dataset contains input and output data (e.g. tunnel boring machine operational data + corresponding rockmass classification; or cone penetration tests + nearby borehole logs...) and there are no restrictions on using it.
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TC304 Engineering Practice of Risk Assessment & Management of the International Society of Soil Mechanics and Geotechnical Engineering (ISSMGE) provides a list of open datasets that include data of soil and rock mechanics on its website.
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Does anyone know a geotechnical engineering software which can support subset simulation? I need to do some probabilistic analysis of a geotechnical project. However, due to the small probability, I need to use subset simulation instead of the crude Monte Carlo analysis.
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Dear RG Community,
I intend to ask you that what are some classical examples of Geotechnical Engineering related problems, for example differential settlement in Leaning Tower of Pisa was/is considered one of the fine problem. Also if you could help me with some of the case studies which you consider will be helpful in understanding the fundamentals and core of Geotechnical Engineering.
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Mr.Muneeb,
I feel the main important one in all over the world is population increase and no space available for developing infrastructure relative to increase in population. so the construction activities have taken place as closer to an existing structure. In view of this, the stability analysis of existing structure adjacent to new construction in terms of excavation, embankment, tunneling or pile driving is a serious problem. As a geotechnical engineer we need to come out with design idea to protect the existing structure due to the effect of new construction.
Another important issue is we don't have excellent supporting ground for the new construction. So, in this case we need to develop economical ground improvement technique to support the load. Ground improvement technique alternate to conventional method is catching up among researcher . ok all the best in your research..
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I'm looking for some experiences on using riprap or other types of mechanical protection methods on soft soil and specially saturated marly slope. Is there any special consideration for using this type of protection on marl?
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In the case of protecting with Riprap, you must take care to place layers of sand and gravel filter in the contact between the marl and the bedrock, to avoid washing and dissolution, reduce the hydraulic gradient of the possible filtration flow and separate the surface runoff.
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Dear All,
When designing structures using computer programs such as CSI SAP2000 or ETABS or any other equivalent software, generally, we input the subgrade modulus in the form of kN/m3. This value can be obtained from the famous Bowles (1996) equation of 40*ultimate bearing capacity. This value corresponds to an allowable settlement of 2.5 cm. However, nowadays, even though soil structure cannot be directly integrated, e.g. using PLAXIS+ETABS or PLAXIS+SAP2000, is it possible to;
  • obtain all the loads from the structure and apply it on a constitutive soil model in plaxis, then convert the loads to equivalent pressure (All loads/Foundation area) and divide this value by the surface settlement, then go back to either ETABS or SAP2000 and apply the obtained subgrade modulus, to observe the difference in settlement values.
The main disadvantage might be the increase of settlements with depth, this leads to, as per the assumption above, several subgrade modulus. I also think softwares like PLAXIS 2D/3D can be really helpful in these situations rather than depending on the assumption of bowles.
Note:
  • The assumption here is, during the absence of adequate field data.
  • This idea might seem a little bit, amateur, please bare with me, as I am trying to learn in this long journey.
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Bowles' equation is one of the most misunderstood equation as also mistakenly recommended above by Mr. Salem for clays. The two pages in Bowles explains itself. He wanted to give a simple equation based on the settlement based bearing capacity equations for sands. For example, Burland and Burbridge. Those equations calculate the load that corresponds to 25 mm settlement in sand.
Simple rules to follow: (if you can convince your client)
  • Forget the 40 x qult equation. Please do.
  • Subgrade reaction is load (as pressure) / settlement. So, calculate the settlement using any method you like. If you want to give only one subgrade reaction, divide average pressure to average settlement.
  • If someone says the calculated subgrade reaction is very low, ask them "compared to what?" The tables presented in Bowles or any other resources based on the soil type are FOR ONLY PLATE LOADING. In that case, B=0.3.
  • Subgrade reaction is E/(B*(1-v*v)) in its simpest form. So, it depends on the B. If Bowles' table says 100.000 for dense sand, it is only for plate loading. For a raft with B=20m, your subgrade modulus will be 5000!
  • Don't use 40 x qult.
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Hi everyone.
Do you know if Optum 2G or 3G is a suitable tool for academic research of Geotechnical problems?
Although I have came across this FE software in a number of papers, I am not sure if it's the right tool. It seems to be more of a commercial software like PLAXIS, rather than academic and research software like ABAQUS.
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Hamed Nuri it really depends what you are looking for and what you want to do. My understanding is that PLAXIS in special is a very robust geotechnical FEM software. The advantaged of these geotechnical software over a general FEM such as ABAQUS is obvious, they were designed specifically to solve geotechnical problems, so there are a bunch of things that are already tailored there. But since ABAQUS is more general it has less limitations, however it is much more user dependent.
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I'm simulating a simple field loading, rigid (1.1*1.1*0.8 m3) footing on Clay (Bothkennar site) and am trying to figure the best soil model for the site via simulating the test, load was applied up to max BC 140 kpa that resulted in 0.2 m settlement. I tried many combinations and using stress control Vs stress control. Also varying soil models, MC worked quite well but HS model gave weaker trend and stiffness though many authors reported its suitability,
I need to check the model because i am so confused figuring what's wrong
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Mr.Fayrouz,
It is better verify soil parameters used to define all these model used in the simulation because results not matching closely with Jardine results except one i.e. PLAXIS - HS model some what nearer to Jardine results. So better verify material properties of the footing, soil, mesh density & size influence and also interface properties b/w soil and footing..ok all the best in your research..
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Dear Researchers,
In FEM software like ETABS instead of incorporating long shell elements in piles, what is the other alternative that could be defined in ETABS, like what should the geotechnical offer the the structural engineer?
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Did you know now through the new version of the SAP 2000 program? The definition, analysis and design of the pillars were added to the program very easily and according to the type of substrate with the definition of all layers of the soil
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Hi friends
I am modeling a geotechnical problem in Abaqus.
How can I give different loading and unloading modulus in mohr-clumb criteria in Abaqus software?
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I also considered this problem. Please see some papers below:
Simulation of ship collision and grounding damage using Hosford-Coulomb fracture model for shell elements:
On the prediction of ductile fracture in ship structures with shell elements at low temperatures
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Hi
What would be the first  step to  learn  Plaxis (self learning ) ? What  would you  suggest 2D or 3D? 
Thank you 
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I would love to have those files.If someone has those files please send them to the following address,
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Hello, all.
I was wondering if there are any attempts of creating artificial soil, so that can be used as a benchmark for different custom tests and constitutive models. Especially interested if cohesive soils can be created (I imagine that cohesionless soils are fairly easy to create ).
Thanks.
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There are some attempts to create artificial soils in a laboratory, mostly cohesive soils. But as far as I am concerned, it seems to be a complicated and requires high technology.
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1- I plan to do the vulnerability analysis of a pipleline subjected to debris flow. Apparently, I am unable to find research articles in this area. Please help me in finding some research articles in this area.
2- Can you please direct me towards some latest methods used for this vulnerability analsysIs?
3- How can I validate this vulnerability analysis?
I am a newbee in research and will appreciate any help in this regard.
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The following articles will give you an idea on vulnerability analysis of Debris flow and its validation
DOI: 10.5194/nhess-13-869-2013
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Can someone provide a manual or a guide of geotechnical investigation procedures for different types of constructions in English? I mean a guide of methodology and standard procedures for transmission towers, bridges, regular houses, etc?
I am interested in a manual which is compatible with Eurocodes or ASTM standards.
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Hi
I am looking for a reliable method to measure creep in the lab for cohesionless, drained soils. All literature ive observed as far seems to skirt over drained soils. Any ideas?
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I strongly recommend you to read the above recently published article (2020) which discusses both Experimental & Numerical Determination of Creep (Long-Term Deformation) of Sand mixed with Granular Tire Rubber Materials.
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I'm searching for open access and peer reviewed international journal (obviously of high quality and with Impact Factor) to publish research on geology, geomorphology, landslides, geotechnics, soil and rock mechanics.
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I would say Applied Sciences or Geosciences journals by mdpi
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Which software is able to create stratigraphy based on drilling logs and CPTs, beside Geo5?
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Hi, you can use Rockworks software.
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The key work of Geotechnical engineering is stability assessments (or analysis) of geotechnical structures or natural slopes. The involved parameters may be dynamic ones during the failure process, for instance, cohesion or friction angle of a rock may be different before and after Uniaxial Compression Testing.
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Dynamic properties of geomaterials or rocks are much lower than static properties determined from uniaxial static strength. Dynamic properties are determined from longitudianal bar wave velocity and shear wave velocity in the medium. It has been found that dynamic strengths of most materials are 5-8 times less compared to static strengths.
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Let's center the discussion mostly on the fact of characterizing geotechnically those solid wastes.
Are probabilistic analysis the best way for these cases of highly heterogeneous materials?
#Slopes #Geotechnics #GeotechnicalEngineering
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Depending upon the site and orientation of rubbish dump, You may assess its physical morphology and depending upon physical/site assessment and heterogeneous material, you may choose preferred locations/section lines, along which you may carry out slope stability assessment with a view to arrive at the status of slope in terms of FoS or Factor of Safety. When < 2, it is normally unstable/critically stable. You need to have the lab-estimated values of select geotechnical parameters used in a particular analysis method. Emperically chosen values from available datasets/ tables etc. may also be used for cross-check, but ideally lab-estimated values would be of more help.
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We are beginners in Engineering Geology and want to set geotechnical laboratory. We are looking for theoretical material an an introduction and focused on eurocodes.
Please, let us know how can we start.
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This book is always useful to me
Designers' Guide to EN 1997-1 Eurocode 7 Geotechnical Design
(from the same authors of Eurocode, then they should know)
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Question to active researchers in the field of Geotechnical Engineering role wide: Kindly advise on your availability to work jointly on funded Research projects? Please identify your specific research area(s) in geotechnical engineering?
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Now I am working mainly in the field of Ground Improvement
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Geotechnical earthquake engineering can be defined as that subspecialty within the field of geotechnical engineering that deals with the design and construction of projects in order to resist the effects of earthquakes.
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Geotechnical earthquake engineering can be defined as that subspecialty within the field of geotechnical engineering that deals with the design and construction of projects in order to resist the effects of earthquakes.
“While many cases of soil effects had been observed and reported for many years, it was not until a series of catastrophic failures, involving landslides at Anchorage, Valdez and Seward in the 1964 Alaska earthquake, and extensive liquefaction in Niigata, Japan, during the earthquake in 1964, caused geotechnical engineers to become far more aware of, and eventually engaged in understanding, these phenomena.” (I. M. Idriss, 2002)
Geotechnical Earthquake Engineering deals with the following geotechnical engineering subjects and problems::
  • Site specific seismic hazard assessment
  • Local site effects
  • Design ground motions
  • Design spectra and response spectra