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Assessment of Mechanical Behavior and Failure Criteria under Varied Confining Pressures in Treated Calcareous Sand Geomech. Energy Environ. (IF 5.1) Pub Date : 2024-03-07 Jianxiao Gu, Haibo Lyu, Bo Li, Hui Chen, Xiaojiang Xu, Xinyu Du
Ensuring project safety for maritime geotechnical structures primarily composed of calcareous sand is crucial. Cement-based reinforcement is a promising strategy to enhance integrity and deformability, especially for overlying infrastructures in high-pressure ocean engineering. Firstly, the specimens are created by blending Portland cement and Gypsum into calcareous sand at contents of 16% and 22%
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A micro-mechanical insight into the thermo-mechanical behaviour of clays Geomech. Energy Environ. (IF 5.1) Pub Date : 2024-03-02 Alice Di Donna, Angela Casarella, Alessandro Tarantino
The response of fine-grained soils to the combined effects of stress and temperature is a problem of growing concern in geoenvironmental engineering. Unlike most materials, fine-grained soils subjected to heating under drained conditions can exhibit either reversible expansion or irreversible contraction, depending on their loading history. This clay complex thermo-mechanical behaviour is widely reported
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Insight into the mechanical degradation of coal corroded by concentrated brine solution Geomech. Energy Environ. (IF 5.1) Pub Date : 2024-02-28 Haiyang Yi, Zhenxing Ji, Jianfeng Liu, Zhuang Zhuo, Sihai Yi, Xianfeng Shi
Underground water reservoirs (UWR) of coal mine plays a significant role in enhancing the ecological environment and safeguarding water resources. The water stored in UWR, known as brine solution, seriously damages the mechanical properties of the coal pillar. However, the mechanical degradation characteristics of coal under the action of different concentration solutions are still unclear. In this
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@Modelling of failure and fracture development of the Callovo-Oxfordian claystone during an in-situ heating experiment associated with geological disposal of high-level radioactive waste Geomech. Energy Environ. (IF 5.1) Pub Date : 2024-02-28 Tsubasa Sasaki, Sangcheol Yoon, Jonny Rutqvist
To ensure the safety of geological disposal of high-level radioactive waste, in-situ experiments have been carried out to examine the behavior of rocks in underground research laboratories (URLs). At the Meuse/Haute-Marne URL in France, the French National Radioactive Waste Management Agency (Andra) has been assessing the Callovo-Oxfordian claystone (COx) as potential host rock of geological disposal
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Rock-mass heterogeneous rheological properties caused the formation of deep tension fractures Geomech. Energy Environ. (IF 5.1) Pub Date : 2024-02-27 Guoqing Chen, Xiang Sun, Qiang Xu, Sihong Zeng, Jingfang Xing, Xuemin Feng, Fangzhou Liu
Tension failure is a unique phenomenon in solid Earth that occurs on scales ranging from large plate rift valleys to small laboratory rocks. On a slope scale, deep unloading tension fractures are distinct from conventional unloading fractures and are a unique geological phenomenon in valleys with high in-situ stress. To accurately reproduce the development and evolution of deep unloading tension fractures
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In memoriam of Patrick Selvadurai Geomech. Energy Environ. (IF 5.1) Pub Date : 2024-02-23 Alessio Ferrari, Tomasz Hueckel, Lyesse Laloui, Panos Papanastasiou, Jean–Michel Pereira, Manolis Veveakis
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Influence of clay fraction on the shear behavior of an interface between sand-clay mixture and concrete Geomech. Energy Environ. (IF 5.1) Pub Date : 2024-02-22 Kexin Yin, Anne-Laure Fauchille, Roxana Vasilescu, Christophe Dano, Panagiotis Kotronis, Giulio Sciarra
In geotechnical engineering, the soil-structure interface is an important aspect to be taken into account in soil-structure interaction because it relates to the stability of supported structure. In particular, the shear behavior of the soil-structure interface plays a key role in the design of civil engineering structures and their analysis over time. The interface is a thin zone of soil in contact
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Modeling thermally driven migration of brine in bedded salt Geomech. Energy Environ. (IF 5.1) Pub Date : 2024-02-10 Hua Shao, Jürgen Hesser, Wenqing Wang, Olaf Kolditz
Stress redistribution after the excavation of a drift leads to the generation of an Ed/DZ (excavation disturbed/damaged zone) in the near field of an opening, with significant changes in the hydraulic and mechanical properties. Further changes can occur under thermal load during the heating period in the post-closure phase of a repository for high-level radioactive waste. Initially more or less randomly
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Hydro-Mechanical coupled analysis of gas injection in clay-based materials using different element types Geomech. Energy Environ. (IF 5.1) Pub Date : 2024-02-07 Yangyang Mo, Alfonso Rodriguez-Dono, Sebastia Olivella
This study investigates the impact of various factors on HM-coupled geological media through a multi-category analysis of the so-called Heat and Gas Fracking model (HGFRAC) and the so-called Gas Threshold Pressure Test (GTPT). The HGFRAC model consists of six different types of benchmark exercises. It is important to note that different types of elements and integration methods used in finite element
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Engineering soil barriers to minimise annual shrinkage/swelling in plastic clays Geomech. Energy Environ. (IF 5.1) Pub Date : 2024-02-03 Aikaterini Tsiampousi, Charlotte Day, Alexandros Petalas
Engineered soil barriers have been proposed to prevent rainwater infiltration into the underlying soil, thus improving stability of sloping ground. The use of engineered barriers on flat ground as means of preventing flooding has also been explored. This paper aims to provide proof-of-concept as to the potential efficiency of engineered barriers in minimising soil shrinkage and swelling arising from
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Coupled multiphase flow and viscoelastic mechanics modeling of gas injection in a compacted bentonite buffer Geomech. Energy Environ. (IF 5.1) Pub Date : 2024-01-19 Shu-Hua Lai, Jui-Sheng Chen, Ya-Hui Yang
Bentonite is chosen as a suitable buffer material for a deep geologic repository for radioactive waste. Thus, understanding the behavior of gas migration in the buffer layer is key to the safety assessment and functioning of such a repository. Based on the gas-injection experiments performed by the British Geological Survey (BGS), the modeling of gas migration in a compacted bentonite is carried out
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Experiment Study on Shear Behavior and Properties of Granite Fractures under Real-time High-temperature Conditions Geomech. Energy Environ. (IF 5.1) Pub Date : 2024-01-22 Pengju Wang, Changsheng Wang, Gang Wang, Yujing Jiang, Feng Xu
Direct shear tests were conducted on granite fractures with similar joint roughness coefficients under real-time high temperatures (up to 400 °C) and constant normal stiffness conditions. In this study, the shearing process was monitored via acoustic emission, and fracture surface morphology was measured with three-dimensional laser scanning. With increasing temperature, peak and residual shear strengths
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Insights from an extensive triaxial testing campaign on a shale for comparative site characterization of a deep geological repository Geomech. Energy Environ. (IF 5.1) Pub Date : 2024-01-22 E. Crisci, S.B. Giger, L. Laloui, A. Ferrari, R. Ewy, R. Stankovic, J. Stenebråten, K. Halvorsen, M. Soldal
Several boreholes were drilled for site comparison of a deep geological repository (DGR) in Northern Switzerland. The main target of the exploration program was the >100m thick Opalinus Clay, the designated host rock encountered at approximately 450 to 1000 m depth in three different sites. This contribution focuses on the evaluation of geomechanical properties and the deformation behavior from the
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The impact of soil layering and groundwater flow on energy pile thermal performance Geomech. Energy Environ. (IF 5.1) Pub Date : 2024-01-22 Qusi I. Alqawasmeh, Guillermo A. Narsilio, Nikolas Makasis, Monika J. Kreitmair
Shallow geothermal energy pile systems have emerged as cost-effective and low-carbon alternatives for heating and cooling buildings, compared to traditional air-conditioning systems. Geothermal applications have been researched extensively in recent years under the assumption of ground homogeneity, and the effect of ground stratification remains mostly unexplored. To investigate this, a 3D finite element
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Performance of complex energy geostructures Geomech. Energy Environ. (IF 5.1) Pub Date : 2024-01-12 Elena Ravera, Alessandro F. Rotta Loria, Lyesse Laloui
Energy geostructures are innovative technologies that combine the functions of structural support and geothermal energy harvesting. To date, theoretical, computational, and experimental investigations have explored the performance of distinct types of energy geostructures, i.e. energy piles, walls, slabs, and tunnels. However, there seemingly exists limited knowledge on the performance of complex energy
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Experimental investigation on the effect of grain size of granitic rocks on the fracture roughness and toughness Geomech. Energy Environ. (IF 5.1) Pub Date : 2024-01-12 Mohsen Aghababaei, Mahmoud Behnia, M.R.M. Aliha
The fracture surface characterization, such as the fracture roughness, is essential to flow and heat transport through the fracture in the geothermal, oil, and gas reservoirs stimulation by hydraulic fracturing. This research presents an experimental approach to assess the correlation between the fracture roughness and mode I fracture toughness (KIc) of the granitic rock with different grain sizes
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Quantifying the variability in fault density across the UK Bowland Shale with implications for induced seismicity hazard Geomech. Energy Environ. (IF 5.1) Pub Date : 2024-01-06 Germán Rodríguez-Pradilla, James P. Verdon
To date, hydraulic fracturing for shale gas extraction has been used at three wells in the UK. In each case, the resulting microseismicity exceeded the UK’s red-light threshold of magnitude 0.5. The three wells all targeted the Bowland Shale Formation, and all were located within close proximity of each other on the Fylde Peninsula in west Lancashire. Observations of hydraulic fracturing-induced seismicity
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Free swelling behavior of MX80 bentonite under elevated temperatures up to 200 °C Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-12-19 Yu Lu, John S. McCartney
This paper focuses on understanding trends in the swelling potential of MX80 bentonite under temperatures up to 200 °C using a high-pressure cell. The free swelling behavior of expansive clays under high temperature and high fluid pressure conditions that may be encountered in geological repositories for high-level radioactive waste is important as the swelling potential is closely linked with key
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Research on petrophysical properties and porosity evolution of fractured coal mass under cyclic impact for coalbed methane exploitation Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-12-23 Penglong Li, Ning Luo, Yunchen Suo, Cheng Zhai, Weifu Sun
In the process of coalbed methane (CBM) extraction, coal seam penetration modification is frequently subjected to several cycle impact due to drilling-blasting method and deflagration fracturing method. Therefore, the split Hopkinson pressure bar (SHPB) was utilized to investigate the impact cycle effect and confining pressure effect on dynamic behavior of coal. Furthermore, the low-field nuclear magnetic
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A screening tool for carbon dioxide injection in gas reservoirs based on the material balance approach Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-12-22 Matheos Giakoumi, Charalampos Konstantinou, Christine Ehlig-Economides, Panos Papanastasiou
Significant efforts are made to reduce the carbon dioxide concentrations in the atmosphere as part of a global scheme that aims to mitigate climate change. Carbon geological storage involves the storage of CO2 permanently in a subsurface reservoir, commonly a brine saturated aquifer, or a depleted reservoir. Carbon dioxide is also injected for enhanced oil or gas recovery (EOR/EGR). This work applies
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The impacts of scaled capillary pressure combined with coupled flow and geomechanics on gas hydrate deposits Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-12-16 Hyun Chul Yoon, Jihoon Kim
In this study, we numerically analyze the effect of capillary pressure on gas hydrate deposits through coupled flow and geomechanics simulation, with a focus on the scaled capillary pressure. The scaled effect is predicated on sediment pore-size variations resulting from hydrate dissociation or formation, leading to non-monotonic capillary pressure curves influenced by two primary factors: alterations
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Micro-macro investigation on bio-cemented sand under different grouting saturation: An effective enhancement method Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-12-18 Ji-Peng Wang, Meng-Chen Li, Meng Qi, Shangqi Ge, Abdelali Dadda
Microbial-induced calcium carbonate precipitation (MICP) is a new biotechnology that can be used to improve the strength of soils. Unsaturated soils are common in nature and saturation is a significant factor affecting the efficiency of bio-cementation. This study investigated the properties of MICP under different grouting saturation conditions. Unconfined compressive strength (UCS) tests confirmed
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Advective gas flow in bentonite: Development and comparison of enhanced multi-phase numerical approaches Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-12-15 E. Tamayo-Mas, J.F. Harrington, I.P. Damians, S. Olivella, E. Radeisen, J. Rutqvist, Y. Wang
Understanding the impact of repository gas, generated from degradation of waste and its interaction with the host rock, is essential when assessing the performance and safety function of long-term disposal systems for radioactive waste. Numerical models based on conventional multi-phase flow theory have historically been applied to predict the outcome and impact of gas flow on different repository
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Evaluating the effect of organic matter contained in shale on hydraulic fracturing of infill-well Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-12-12 Kaixuan Qiu, Shiming Wei
Organic matter which is scattered uniformly in shale can respond to the applied stress and result in the variation of stress field. However, the effects of organic matter content in organic-rich shale on stress interference have not been well considered during developing infill-wells. A fully coupled numerical model is proposed in this paper to consider the whole flow spectrum of shale gas and investigate
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On the resilience of bio-cemented silica sands in chemically reactive environment Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-12-12 XiaoJie Tang, ManMan Hu
Exposure of geomaterials to an acidic environment is frequently encountered in modern-day geo-energy and geo-environmental engineering activities, in e.g. incorporation of chemical stimulation for unconventional shale gas exploitation, enhanced geothermal systems, geological carbon sequestration, and the long-term regional stability in carbonate-rich coastal areas. The Multiphysics-involved process
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Laboratory validation of a new hydro-mechanical energy-based brittleness index model for hydraulic fracturing Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-12-09 Runhua Feng, Joel Sarout, Jeremie Dautriat, Yousef M. Al Ghuwainim, Reza Rezaee, Mohammad Sarmadivaleh
Brittleness Index (BI) is a critical parameter characterising the deformation regime of geo-materials, covering the range from purely brittle (fractures) to ductile (plastic flow). A variety of BI models have been developed based on rock properties such as mineralogy, elastic parameters, or constitutive law. However, very few of them are based on the hydro-mechanical interactions emerging in underground
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Single fluid-driven crack propagation in analogue rock assisted by chemical environment Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-12-08 Jing Chen, Manman Hu
During the operation of hydraulic fracturing as used in many geo-energy and geo-environment applications, chemical stimulation is often incorporated for cracking enhancement in low-permeability geological formations for the purpose of an optimization of energy recovery. The mechanism of subcritical crack propagation in a chemically reactive environment is essential for understanding of the involved
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Experimental study on tensile strength of granite residual soil during drying and wetting Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-12-07 Yinlei Sun, Zhifei Li, Xinsheng Zhang, Qian Huang, Yueqin Wu, Jianbin Xie
The tensile strength of remolded granite residual soil under different water content conditions, during wetting and drying, was investigated using a self-made horizontal direct tension apparatus. The variations in tensile strength and the microcosmic mechanism of shrinkage crack formation and development were elucidated from the perspectives of suction stress and cementing force. Experimental results
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Modelling the thermo-mechanical behaviour of a rock joint Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-11-30 Thanh Son Nguyen, Olaf Kolditz, Jeoung Seok Yoon, Li Zhuang
The CNSC, the Canadian regulator for the nuclear industry, participated in DECOVALEX-2023 Task G that focuses on the thermo (T) - hydro (H)- mechanical (M) behaviour of rock joints. Joints are omnipresent in rock masses and are planes of weakness in the host rock. When deep geological repositories (DGRs) for radioactive waste are being considered in areas where rock joints are present, the joints could
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Constraint strategies for estimating in-situ stress from borehole measurements Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-12-02 Hongxue Han, Mirko van der Baan
In this study, we describe strategies to reduce uncertainties in the estimation of in-situ stresses. The strategies are based on the commonly used poro-elastic model with strain corrections for in-situ stress estimation. In addition to the calibration of the minimum horizontal stress magnitudes from measurement data, we further constrain the magnitude of maximum horizontal stress quantitatively with
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Temperature dependence of soil-structure interface behaviour in the context of thermally-activated piles: A review Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-12-01 Arianna Lupattelli, Diana Salciarini, Francesco Cecinato, Manolis Veveakis, Teresa Maria Bodas Freitas, Peter John Bourne-Webb
Thermally-activated (TA) piles are cost-effective technologies with the dual role of transferring structural loads to the ground while exchanging heat with the surrounding soil as part of shallow geothermal energy systems. As TA piles are subjected to both thermal and mechanical loads, the behaviour on the soil-structure interface is particularly complex and is key for the analysis and design of these
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Hydraulic properties of sediments from the GC955 gas hydrate reservoir in the Gulf of Mexico Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-12-01 Imgenur Tepecik, Yumeng Zhao, Yongkoo Seol, Adrian Garcia, William F. Waite, Sheng Dai
The economic feasibility of gas production from hydrate deposits is critical for hydrate to become an energy resource. Permeability in hydrate-bearing sediments dictates gas and water flow rates and needs to be accurately evaluated. Published permeability studies of hydrate-bearing sediments mostly quantify vertical permeability; however, the flow is mainly horizontal during gas production in layered
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Assessment method for determining rock brittleness based on statistical damage constitutive relations Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-11-23 Kai Chen, Roberto Cudmani, Andres Peña
The brittleness index of rocks is able to provide crucial guidance to the operation of the drilling and hydraulic fracturing. The definition and evaluation method of the rock brittleness has not yet been unified and standardized due to their diversity. We therefore develop an evaluation method of the rock brittleness based on statistical damage relation. A set of uniaxial compression tests on different
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Experimental study on improving hydraulic characteristics of sand via microbially induced calcium carbonate precipitation Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-11-26 Liang Guo, Baoquan Wang, Jiayi Guo, Hao Guo, Yuhong Jiang, Min Zhang, Qichen Dai
Microbially induced calcium carbonate precipitation (MICP) technology has garnered significant attention for enhancing soil engineering properties, presenting a potential alternative to traditional cementitious materials for soil seepage control. This study investigates the application of MICP to enhance the hydraulic characteristics, specifically reducing porosity and hydraulic conductivity, of loose
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Effect of temperature on gas breakthrough and permeability of compacted loess in landfill cover Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-11-17 Shaojie Wen, Wen-Chieh Cheng, Wenle Hu, Dongfeng Li, Longtan Shao
In China, municipal solid waste containing large amounts of kitchen waste possesses the characteristics of lower cellulose content (15% on a dry basis) and a faster CH4 generation rate. This promotes the emission of hazardous gases and the increase in gas pressure in landfill cover systems. The higher temperature further aggravates the aforesaid phenomena. The present work investigated the temperature
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Effects of in-situ stress on heat transfer in fracture networks Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-11-17 Yunzhe Jin, Chen He, Chi Yao, Zhejie Sun, Xiaobo Zhang, Jianhua Yang, Qinghui Jiang, Chuangbing Zhou
Stress-induced fracture deformation is the principal cause for permeability change in geothermal systems. This study focuses on the influence of the nonlinear deformation and dilation effect of fractures on the geothermal system under the action of in-situ stress. By adopting a nonlinear constitutive model of rock fractures and embedding discrete fracture networks, numerical studies are first conducted
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Experimental study on P-wave response characteristics of hot dry rock under high temperature and high confining pressure Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-11-10 Song Deng, Yixin Zhang, Xiaopeng Yan, Shuo Yang, Chaowei Li, Haoping Peng
In the exploration and development of hot dry rock reservoirs, accounting for lithology, temperature, and confining pressure is vital when predicting rock mechanical properties. Acoustic logging data is essential for accurate information in hot dry rock fracturing. However, under high-temperature and high-confining pressure conditions, logging signals in these reservoirs become more susceptible to
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Coupled thermo-hydro-mechanical model for simulating thermal history-induced voids in buffer material Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-10-29 N. Adla, P.K. Bhukya, D.N. Arnepalli
The thermo-hydro-mechanical processes in a deep geological repository (DGR) influence the bentonite buffer’s long-term performance. The buffer’s temperature evolution over a repository’s service life imposes a thermal history in the DGR. The developed thermal history cause shrinkage of the buffer and generates the technological voids (i.e., annular gaps) in a DGR. The void formed compromises the intimate
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Model of shear strength of ultra-deep fractured sandstone considering fracture morphology Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-10-17 Huiwen Pang, Shuai Yang, Yu Liang, Yanru Zhang, Yan Jin
Ultra-Deep fractured tight sandstone gas reservoir, the hotpot unconventional petroleum resources, has been the subject of investigation recently. Due to the presence of natural fractures, drilling in ultra-deep fractured tight sandstone may cause complicated wellbore instabilities, which resulted in a substantial challenge to the efficient exploitation and production of tight gas resources. In order
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The impact of thermal transport on reactive THMC model for carbon capture and storage Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-10-16 Sulaiman Abdullah, Kai Wang, Xiaohui Chen, Amirul Khan
Addressing current limitations in Thermo-Hydro-Mechanical-Chemical (THMC) models is crucial for accurately simulating complex physical and chemical interactions in carbon capture and storage (CCS) processes. This paper presents a new fully coupled THMC model, specifically focusing on investigating thermo-chemo coupling (dissolution) effects for CCS applications. The model is a further extension of
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Fracture network organization with continuation of injections in the Habanero field (Cooper Basin, Australia) disclosed by coda wave fluctuations Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-10-09 Georgios Chatzopoulos, Georgios Michas, Filippos Vallianatos
Hydraulic stimulation of a geothermal reservoir aims to increase the permeability of the rock formations by creating/enhancing a fracture network, to take advantage of the geothermal energy hosted by deep hot formations. A common side effect of the fracturing process is the small-in-magnitude but abundant induced seismicity. In this work, we study the seismicity induced during the hydraulic stimulation
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Modifying the orientation of hydraulically fractured wells in tight reservoirs: The effect of in-situ stresses and natural fracture toughness Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-10-05 Joseph Sherratt, Amin Sharifi Haddad, Roozbeh Rafati
Hydraulic fracturing in shale formations containing natural fractures can lead to complex and branched fracture networks which may fail to efficiently access hydrocarbons deep in the formation away from the well. In this study, to minimise the negative effects of natural fractures, the orientation of hydraulically fractured wells in such formations is investigated with the focus on the effects of in-situ
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Development of bio-grout injection strategy and design guide using reactive transport model for field-scale soil improvement based on microbially induced calcium carbonate precipitation (MICP) Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-10-04 Oliver Ramos, Tae-Hyuk Kwon
Microbially induced calcium carbonate precipitation (MICP) has garnered huge interest for its potential as an alternative and sustainable ground improvement method as it exploits natural microbiological processes. To this date, there is little or no guidance on the injection strategy to achieve a uniform calcium carbonate distribution at a field scale and most of the MICP method is still limited to
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Proxy-based Bayesian inversion of strain tensor data measured during well tests Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-09-22 Soheil Roudini, Lawrence C. Murdoch, Mohammad Shojaei, Scott DeWolf
Recent instrument developments have made it possible to measure the strain tensor caused by injecting or pumping fluid from aquifers or reservoirs, but the full value of these data is limited because the long runtimes of poroelastic forward models makes it impractical to use many inversion schemes. This limits the interpretation of strain data for managing the recovery of resources or storage of wastes
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Failure characteristics and brittleness index establishment based on marble energy evolution mechanism Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-09-15 Songyu Li, Zhiliang Wang, Jianguo Wang, Chenchen Feng, Ao Li, Weixiang Wang
The “carbon peak” and “carbon neutrality” require a continuous increase of clean energy supply, and hydropower shares a big portion of clean energy in China. The Jinping II Hydropower station is the biggest one and its main surrounding rock is marble. Thus, the failure characteristics of its marble holds great significance in safely and economically devising support measures of tunnel groups in this
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Investigating the strength and durability properties of alkali activated red mud for tailings pond embankment material Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-09-09 Surender Singh, Abhishek Kumar, T.G. Sitharam
This article investigates the applicability of alkali-activated red mud (RM) as a geo-material for the construction of tailings pond (TP) embankments. A series of unconfined compressive strength (UCS) and direct shear tests (DST) are carried out to examine the mechanical performance of RM activated with sodium hydroxide (NaOH). While doing so, the influence of NaOH concentrations, curing conditions
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Fracture behavior of yellow sandstone under freeze–thaw cycles with varied saturation states: An investigation of mode I fracture Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-09-09 Tubing Yin, Jianfei Lu, Yang Yu, You Wu, Jihao Wang, Jiaqi Men
In cold regions, the behavior of fissured rock in rock engineering is significantly affected by freeze–thaw (F–T) cycles. To investigate the impact of freeze–thaw cycles on rock fracture behavior, freeze–thaw cycle treatment, and fracture tests were conducted on Cracked Straight Through Brazilian Disc (CSTBD) specimens. The freeze–thaw treatment notably degraded the physical and mechanical properties
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Flow simulation in 3D fractured porous medium using a generalized pipe-based cell-centered finite volume model with local grid refinement Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-09-14 Lei Sun, Xuhai Tang, Mei Li, Aly Abdelaziz, Kareem Aboayanah, Quansheng Liu, Giovanni Grasselli
The presence of fractures in porous media strongly influences the fluid flow behavior. This work presents an efficient and simple numerical model to address the hydrodynamic behavior of complex fractured porous media, aiming at balancing computational efficiency and accuracy. Fractures are mapped to a set of cells having implicit aperture, where local grid refinement (LGR) is adopted around the fracture
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Landslide susceptibility evaluation in Alpine environment: 2. Thermo-hydro-mechanical modeling for the response to climate-related variables Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-09-09 Andrea Morcioni, Tiziana Apuani, Francesco Cecinato, Manolis Veveakis
This paper is Part 2 of two companion papers, proposing a multidisciplinary approach to assess stability and velocity evolution of a large landslide located in the Central Italian Alps (upper Valtellina region): the Ruinon landslide. Part 1 of this work presented a 3D stress–strain finite element analysis, which assessed the morphological and geomechanical predisposition of the slope to gravitational
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Effect of thermal cycles on volumetric and shear behavior of sand–concrete interface Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-09-07 Kexin Yin, Roxana Vasilescu
Energy piles are dual-purpose foundation elements that transfer the building loads to the supporting soil and act as heat exchangers for heating and cooling. Energy piles are subjected to heating and cooling cycles over days and seasons, resulting in cyclic expansion and contraction. The cyclic expansion and contraction bring about the modification of vertical stress and the increase of vertical displacements
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Fracture and porosity evolution of coal under uniaxial compression: An in-situ X-ray tomography study Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-09-07 Yanbin Yu, Zhaoxu Qiu, Weimin Cheng, Qi Yang, Wenting Cui, Kang Rong, Yunfei Li
To investigate the meso-structure evolution and fracture mechanism of coal under uniaxial compression, an X-ray three-dimensional scanning microscopy in-situ loading test bench was used to conduct a uniaxial compression test of coal. CT data were obtained under different strain conditions and combined using 3D visualization software. According to the surface porosity under different axial forces shows
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Landslide susceptibility evaluation in Alpine environment: 1. 3D Finite Element modeling of the Ruinon (IT) case study Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-09-06 Andrea Morcioni, Tiziana Apuani, Francesco Cecinato, Manolis Veveakis
This manuscript is Part 1 of two companion papers that explore a multidisciplinary approach to predict velocity and stability of a large landslide located in the Central Italian Alps: the Ruinon landslide. The area is of high geological interest due to the presence of numerous shallow and deep gravitational instability processes that affect valley flanks, mainly driven by unfavorable morphological
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Physical–mechanical properties and microstructure degradation of acid–alkali contaminated granite residual soil Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-09-06 Yang Chen, Liansheng Tang, Yinlei Sun, Zihua Cheng, Wenteng Gong
Acid—alkali pollution can lead to problems related to surrounding conditions, the health of the earth, and changes in soil physical–mechanical properties and microstructure. However, the response characteristics of acid–alkali pollutants to soil physical–mechanical properties and micro mechanisms under flowing conditions are still unclear. To address this gap, we used a self-developed circulating seepage
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Geotechnical and engineering properties of expansive clayey soil stabilized with biomass ash and nanomaterials for its application in structural road layers Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-09-05 J.L. Díaz-López, M. Cabrera, F. Agrela, J. Rosales
Clayey soils often pose issues such as swelling, high plasticity, low permeability, and low bearing capacity, particularly in regions with seasonal rainfall. Consequently, soil improvement techniques are necessary for constructing road base layers. Currently, the most used method for road stabilization involves the application of traditional binders such as lime and cement. However, the production
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Stress field analysis: Construction of site descriptive model of underground research site in KAERI Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-09-04 Chae-Soon Choi, Yong-Ki Lee, Sung-Hoon Ji, Suyeon Hong, Kyung-Woo Park
This study aims to integrate geological investigation data and construct a rock mechanical site descriptive model relative to site selection research for deep geological disposal of spent nuclear fuel. As preliminary research for the model construction process, a sub-divided numerical domain was introduced by adopting existing fracture zone in the site region of an underground research facility in
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Creep behavior and permeability evolution of red sandstone in three Gorges Reservoir area subjected to cyclic seepage pressure Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-09-02 Qiang Wang, Shengwang Hao
The creep behavior of the rock mass in an anchoring section affects the control effect of the stabilizing piles and the long-term stability of the landslide-stabilizing pile system. Additionally, periodic reservoir water level fluctuations cause cyclic water-seepage pressure changes in the rock mass of bank slopes, which may promote rock creep deformation, further compromising the stability of the
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Determination of fault damage zones in sandstone rocks using numerical models and statistical analyses Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-09-02 Marcello Congro, Alexandre S. Zanatta, Karoline Nunes, Roberto Quevedo, Bruno R.B.M. Carvalho, Deane Roehl
The width of fault damage zones is usually assessed through scaling relationships using fault displacements measured from outcrops. However, field data show a large dispersion, indicating that other variables, such as rock properties, can affect the development of damage zones. This article proposes a novel, practical and efficient methodology to predict the width of fault damage zones in sandstone
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Experimental study on contact erosion at the interface between the weak interlayer and the crushed zone Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-08-25 Xingjie Zhang, Ahmed Benamar, Yulong Luo
Contact erosion, one type of internal erosion, is a significant risk to the dam’s safety. Weak interlayer, one of the weakest elements in rock foundations, is vulnerable to contact erosion. In this study, a newly developed triaxial apparatus was employed to investigate the contact erosion at the interface between the weak interlayer and the crushed zone under high triaxial pressure and high water-head
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Enhancing fiber–matrix interface permeability resistance of natural fiber-reinforced, bio-cemented sand by CaCO3 seed pretreatment Geomech. Energy Environ. (IF 5.1) Pub Date : 2023-07-20 Liang Guo, Qichen Dai, Xingzhu Lin, Yuhong Jiang, Baoquan Wang, Xiaohua Pan, Yiqi Peng, Guoqiang Zhao, Yi Ru, Liye Zhou
This study explores the application of roughness pretreatment on plant-based natural fiber surfaces to enhance the sealing effectiveness of the sand-fiber interfacial. The technique roughens the reinforced material by presetting CaCO3 seeds on the fiber surface, thereby immobilizing more bacteria as nucleation sites, further increasing the interfacial bonding area by promoting bio-mineralization and