Questions related to Geotechnics
- 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.
- I wonder what other new materials can as binding to reduce cement or concrete?
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.
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.
Dear all, is anyone aware of any ´´large´´ open database of soil geotechnical properties? I would like to use them for machine learning purposes
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.
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?
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?
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.
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?
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.
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?
I'm willing to prepare a loess ( collapsible) soil in order to test it's collapse potential in accordance to the ASTM Standards.
In a geotechnical laboratory which instrument can be used for determining soil CEC and what is the approach?
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?
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?
I would prefer experimental findings, not conclusions such as the fact that it is above 1 and can conservatively be taken as 1.
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.
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.
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?
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.
- 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.
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?
LBM, SPH, MPM, and PFEM, which one is better for fluid simulation in geotechnics? (free surface and coupled engineerings)
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  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?
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.
Please share your experiences on the use of Ansys and CivilFEM in geotechnical modelling. The advantages or disadvantages compared to the other FEM software.
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?
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.
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.
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,
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,
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.
What are the geotechnical parameters that affect the performance of the box culvert for the Rod Under Bridge (RUB) design?
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?
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.
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 )
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?
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 ?
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
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?
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
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)
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.
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.
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.
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.
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?
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.
- 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.
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.
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
I am modeling a geotechnical problem in Abaqus.
How can I give different loading and unloading modulus in mohr-clumb criteria in Abaqus software?
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 ).
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.
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.
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.
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.
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
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.
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?
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.
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