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Article
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This work aims to investigate the mechanical behaviour of medium-grained sandstones under cyclic loading with different loading/unloading rates. This type of cyclic loading is called differential cyclic loading (DCL) and is considered for testing rock behaviour. In the experiments, constant amplitude and multi-level cyclic loadings were performed....
Conference Paper
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L'ultimo Posto tra i Monti della Tolfa i Monti Sabatini, ed il Lago di Bracciano, al centro di un'area ricca di giacimenti minerari (zolfo, manganese e marcasite) e punti di emissione di gas ed acque termali, Monterano. fu un importante centro urbano in età etrusca, la cui floridezza è documentata soprattutto dalle necropoli rupestri circostanti. D...
Article
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An in-depth understanding of damage threshold behavior during rock damage and failure is critical to predicting short- and long-term rock stability. The percolation theory was used to describe the rock damage threshold behavior and the Renormalization Group theory was used to accurately solve the theoretical solution of the critical threshold of br...
Article
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With the increasing complexity of engineering geological conditions, the problem of tensile-shear failure of bolts is becoming more serious. Accurate modelling of the performance of bolted rough joints subjected to tensile-shear load is essential for support design. In this paper, based on the theoretical criteria of bolt failure, the mechanical mo...
Chapter
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D'Onofrio, S. C. T.; D'Onofrio, M. F. T.; D'Onofrio, H. C. T. (2022). Political music in Brazil: An examination of Punk Rock in Brasília, 1979-1985. In: Onyebadi, Uche (Ed.). "Political Messaging in Music and Entertainment Spaces across the Globe. Vol. 1". Wilmington: Vernon, p. 137-161. Official website: https://vernonpress.com/book/1510.
Article
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Based on the results of a study of the porous carbonate rocks in the Jinping area conducted from 2004 to 2019, we developed a research algorithm to analyze polarized images of these rocks and compared the porosity magnification of these polarized images. We obtained the current karst development rate by combining the historical karst development ra...
Article
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The nonlinear stability control of surrounding rock with large deformation is the key issue in realizing rapid excavation of deep soft rock roadway. Combined with various research methods, this paper deeply analyzes the characteristics of instability. Through the modified Drucker-Praeger criterion, the mechanism of roadway instability under the cou...
Conference Paper
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Deep underground works commonly present a brittle failure process, known as spalling, together with high convergence displacements, called bulking. In the present work, a pseudo-discontinuum modeling technique called Continuum Voronoi block model - CVBM was applied to represent the spalling and bulking phenomena in excavations with high stresses. T...
Conference Paper
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O artigo tem por objetivo elaborar um quadro conceitual e analítico preliminar direcionado às figuras do cansaço e de seu estágio paroxístico, o esgotamento, em filmes ficcionais brasileiros recentes protagonizados pela classe trabalhadora. À luz de uma bibliografia que reconhece entre os predicados da fadiga um abatimento em curso, durativo, e um...
Article
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Ukrainians are neither humans, nor people, nor Slavs. They are Satanic offspring since they sold their souls to US-NATO Satan for a few Satanic “gifts”, a handful of bloody US dollars, drugs, and rock ‘n’ roll, as the Ultimate Values, thus betraying the Holy Slavic tradition and the Slavic cause.
Article
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Mechanical and fracture behaviors of rocks are largely dependent on the rock structure and existing flaws. This study mainly focuses on the combined effects of bedding plane and void on the tensile mechanical behaviors of layered rock. Brazilian tensile tests accompanied by acoustic emission (AE) and image collecting testing were first conducted on...
Article
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Based on formal and compositional analyses of the rock art sequence of the Real Grande 3 (rg3) rock shelter, the authors propose that the site was used recurrently between ca. 5000 and 1500 Bp. Taking into consideration of its location in an area of highland ravines (4000 masl), its proximity to a freshwater spring and year-round watercourse, its r...
Presentation
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This research refers to the study effect of vibration resulting from the rock crushing device on human health by studying the effect on the blood parameters of workers on this device for a period ranging from ten years and above. Samples were collected from people working in rock breakers (Jackhammer) in several areas of the province on 10/5/2020 a...
Thesis
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The multi-scale hierarchical Soil-Landscape Information System (SLIS) is designed to develop, visualize and use the Soil-Landscape Classification System (SLCS), as well as integrate information on soils and landscapes. Currently, the SLIS allows integrating information on the names and diagnostic criteria of natural soils and landscapes, the essent...
Article
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The present report is the result of our intensive investigation conducted in the southern part of the Bargarh upland, Odisha with particular reference to an inselberg located close to the village of Kundakhai. The most interesting aspect of the lithic assemblage recovered from this site a predominance of Levallois elements the assemblage includes c...
Article
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In this paper, the theoretical radii of the crushed and cracked zones for underwater rock drilling and blasting with coupling charge under different water depths were computed, and the dynamic finite-element software LS-DYNA was employed to simulate the failure zone of underwater rock drilling and blasting. The results show that the ranges of the c...
Article
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The mechanical fracture compliance is of interest in a number of geoscientific applications. Seismic borehole methods, especially full‐waveform sonic (FWS) data, have indicated their potential to infer the compliance of macroscopic fractures under in situ conditions. These approaches rely on the assumption of a homogeneous background embedding the...
Poster
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Pre-eclampsia is a poorly understood complication of pregnancy, affecting 2-8% of pregnant women worldwide, with a UK rate of approximately 3%. The classical clinical features of pre-eclampsia are new onset hypertension and proteinuria developing in pregnancy and resolving after delivery. In 2020 Weqas developed an EQA programme to assess and monit...
Article
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The method proposed by the authors makes it possible to determine the nature of changes in two components (intergranular and fracture) of the total porosity. Changes in the fracture and intergranular porosity were investigated during fracture nucleation of sandstone samples under modeling in situ conditions. Sandstone samples were held at constant...
Article
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The devastating damage after the 1999 Chi-Chi and 1999 Izmit earthquakes has greatly motivated soil–reverse fault interaction studies. However, most centrifuge modeling studies have employed a single homogeneous soil layer during testing, which does not represent in situ conditions. Indeed, while geological conditions vary spatially, engineering so...
Article
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This study investigates the water saturation effects on the dynamic compressive strength and fragmentation behavior of Indian gabbronorite. A selection of gabbronorite was divided into specimens that were either saturated in distilled water for 120 days or dried in a vacuum oven at 105∘\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{...
Article
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During the operation of the Jinping II hydropower station, the rocks surrounding the headrace tunnels have undergone failure because of the time-dependent creep effect that occurs due to the high geostress present and seepage. However, a few studies of the creep deformation of deep rocks have taken into account the coupling effect between excavatio...
Article
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With the development of 3D printing and computer numerical control machining techniques, extremely complicated models physically simulating the underground structures in rock engineering were conducted. Whether these artificial materials can accurately simulate the cracking and failure modes of natural rocks should be studied. The present study use...
Article
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Determination of the straight downrange of geologic formation between geographic latitude 8.30 0 N to 9 0 N and longitude 3.30 0 E to 4.30 0 E of the Igbeti schist belt became a thing of interest due to the ongoing exploration in the region. Aeromagnetic field intensity anomaly data of the bound were then acquired, separated off the regional field...
Article
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During the drilling process, wellbore instability leads to a complex wellbore morphology. Thus, serious drilling accidents, such as leakage and sticking, can occur. Therefore, it is important to choose different failure criteria for different geological engineering conditions to calculate the safe density window of the drilling fluid to prevent bor...
Article
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A systematic approach for generating a stochastic void geometry with controllable shape features is proposed for more realistic numerical modelling of porous rock materials. The numerical model (a finite-discrete model) is established by integrating zero-thickness cohesive elements with finite solid elements, to trace the progressive fracturing and...
Article
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Empirical approaches play a significant part in the prediction of squeezing conditions in tunnels or caverns. On analysis of collected squeezing data from published literature, no empirical squeezing equations have been found for tunnels with a depth of more than 850 m. In this paper, an attempt has been made to generate linear classifications usin...
Article
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A unified strain-hardening and strain-softening (UHS) elastoplastic constitutive model is developed to capture the nonlinearity of intact rocks. Three new developments are incorporated into the model: (i) a unified strain-hardening and strain-softening rule, which is used to describe the nonlinearity of the stress–strain curve; (ii) the cohesion lo...
Article
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Herein, the mechanisms underlying the slip and failure of a coal-rock parting-coal structure (CRCS) under biaxial compression with horizontal unloading were investigated using numerical simulations and field observations. The failure and instability characteristics were studied, including fracture, slip, and energy release characteristics, as well...
Article
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The safety and sustainability of subsurface applications requires a profound knowledge of the local stress state which is frequently assessed using 3D geomechanical-numerical models. Various factors lead to generally large uncertainties in these models. The variabilities in the rock properties as one of the sources of uncertainties and their influe...
Article
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Natural rock joints are rarely dry or saturated. It is therefore essential to quantitatively assess the influence of varying saturations on shear properties of rock joint. In this study, to guarantee the test repeatability, artificial rock joints with various roughness coefficients (JRCs) of 0, 7.3, 10.1, and 12.9 are firstly reproduced by utilizin...
Article
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In order to explore the directional support method of jointed rock mass and ensure the stable operation of roadway, the support effect of jointed rock mass was analyzed by numerical simulation and on-site monitoring. The results showed that directional support could effectively reduce the deformation and ensured the stability of surrounding rock. I...
Article
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Received: 20 February 2022 The gravity and magnetic data of Al-Tharthar lake and surrounding areas in central Iraq were considered to study the tectonic situation in the area. The residual anomalies were separated from regional using the polynomial method with three orders. The Total Horizontal Derivative anomalies of gravity and magnetic are used...
Article
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This study aimed to investigate the acoustic emission (AE) behavior of rock salt under combined creep and fatigue. The loading path was in a stress-controlled mode and contained a constant stress load with different durations, followed by cyclic loading. The AE counts, peak frequency, amplitude, b-value, and RA (rise time/ amplitude)-AF (average fr...
Article
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• A state of art approach to evaluate the elliptical tunnel stability of Hoek–Brown rock mass. • Rigorous upper bound and lower bound solutions of elliptical tunnel stability are derived using advanced fnite element limit analysis. • Comprehensive design tables and equations are proposed for stability evaluation.
Article
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Patterns of superposition in rock art are often used to systematically construct style sequences. However, once on the rock, images can affect subsequent engagements with the art, the rock surface, the site, and its surrounding landscape, and this recursiveness can be studied through the superimpositions (significantly overlaid markings) on a rock...
Article
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Reliable size-effect law for discontinuous rock mass is the premise of projection of the scale-down model test results to practical engineering applications. In this study, 3D printing technology is engaged to manufacture repeatable and scalable rock models in different scaling ratios. Compression tests show that the strength, modulus, and failure...
Article
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El objetivo de este trabajo es publicar los grabados rupestres del Monte das Porreira 6, situado en Paredes de Coura, en el no de Portugal. El estudio se ha basado en un levantamiento fotogramétrico y el posterior contraste con la determinación de la distancia geométrica. Se trata de una roca profusamente decorada con una larga diacronía de grabado...
Article
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Use-wear traces are considered to be material specific. The use of an appropriate reference collection is thus fundamental for interpreting tools’ function. To test whether a flint reference collection can be used to interpret the function of non-flint tools, I conducted experiments using chert, dolerite, and quartz end scrapers and flakes. I compa...
Article
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Se analizaron datos de calidad de agua subterránea de los estados de Chihuahua, Coahuila y Durango (N=704) para determinar la distribución de tres contaminantes comúnmente presentes en el área, arsénico (As), fluoruro (F), y nitrato (NO3-N), y determinar el efecto de factores de enriquecimiento. Dichos factores incluyen evaporación, intemperismo de...
Preprint
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A human is a thing that moves in space. Like all things that move in space, we can in principle use differential equations to describe their motion as a set of functions that maps time to position (and velocity, acceleration, and so on). With inanimate objects, we can reliably predict their trajectories by using differential equations that account...
Conference Paper
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IRAAR, International ResaArch group on Quarries and Rock-cut sites, is a research network launched in March 2021 at the conference From quarries to rock-cut sites: Echoes of stone crafting. The group aims to promote archaeological studies of rock-cut sites and quarries in a diachronic and international perspective, bringing together, specialists wo...
Poster
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The Knowledge of in situ stresses is fundamental to many studies in earth sciences. Geotechnical Engineering Department of NIRM is having vast experience in this field and stress measurements were conducted for the needs of industry for the last 28 years. The significant achievements are highlighted as under.
Book
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Este livro é composto por uma coletânea de 10 artigos e é uma homenagem à Profa. Dra. Rosane Rocha Pessoa.
Article
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Las pandemias son un fenómeno recurrente en la historia de la humanidad, regularmente cada siglo surge un par de dichos eventos (Morens et al. 2021). A pesar de los avances en comprender y manejar brotes potencialmente pandémicos, la aparición de nuevos patógenos causantes de enfermedades de preocupación tiende a ser más frecuente (Priyadarsini et...
Book
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A série Diversidade linguística na América se propõe a ser um meio para expandir, aprofundar e consolidar o conhecimento e a preservação da diversidade de línguas americanas, baseado nos avanços de distintas perspectivas teórico-analíticas da Linguística (descritiva, comparativa, diacrônico-evolutiva, de contato, tipológico-funcional, cognitiva, en...
Article
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In order to explore the influence of weak interlayer on blasting characteristics in natural rock mass, by using the particle flow code (PFC2D), a single hole blasting numerical model of hard rock with soft interlayer is established. The blasting experiments at different positions and thicknesses of weak interlayer are carried out. Then an in-depth...
Article
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The dynamic response of rock mass is largely restricted by its joint surface. Previous studies have shown that the degradation of joint surface can not be ignored when calculating the shear strength of structural plane under cyclic load. Although several studies have attempted to calculate the cyclic shear strength of a rock mass joint surface, an...
Technical Report
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This research carried out between 2020 and 2021 analyses the impacts of holding Viña Rock, as well as its consequences from the perception of the parties involved (local community, industry and visitors). Viña Rock is one of the most important festivals in Spain and is considered of regional tourist interest. In 2019 it was the second most importan...
Article
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Hydraulic fracturing combined with horizontal drilling is widely used to develop shale gas resources, and huge amounts of fracturing fluid are injected into shale reservoirs. However, the fracturing fluid is ineluctably retained in reservoir rocks after fracturing, resulting in the alteration of shale pore systems and further affecting the hydrocar...
Article
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Para compreender as transformações urbanas que ocorreram sobre o espaço amapaense, é preciso entender as mudanças decorrentes de fatores que estiveram sob decisões políticas capazes de interferir na estrutura do espaço urbano, nas condições sociais e econômicas que influenciaram a organização das cidades amapaenses e nos vínculos territoriais com o...