Article
Engineering, Mechanical
Bingqian Yan, Hongpu Kang, Xiangshang Li, Qingjie Qi, Bo Zhang, Jianzhong Liu
Summary: The paper focuses on the damage evolution law and mechanical property weakening mechanism of jointed rock mass under hydro-mechanical coupling. The mineral composition of rock specimens was analyzed and the distribution law of nuclear magnetic resonance T2 spectrum of granite under different axial stress was studied. Furthermore, the mechanical properties of jointed rock samples under triaxial stress and seepage pressure were investigated.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Engineering, Geological
Aiqing Wu, Lei Fan, Xiang Fu, Yihu Zhang, Zuowu Zhong, Meiwan Yu
Summary: The study investigated the influence of water pressure on the shear and compression deformation of rock mass, finding that changes in water pressure caused significant shear and tensile deformation, affecting the compressive strength of the rock mass. Additionally, water pressure had a hysteresis effect on shear and tensile displacement, consistent with field monitoring data.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Environmental Sciences
Farzad Basirat, Chin-Fu Tsang, Alexandru Tatomir, Yves Guglielmi, Patrick Dobson, Paul Cook, Benoit Dessirier, Christopher Juhlin, Auli Niemi
Summary: The specialized downhole probe, SIMFIP, was used to study the coupled hydromechanical behavior of rock fractures through field experiments. The experiments revealed insights into pressure-induced fracture initiation, propagation, and shear due to hydraulic fracturing. By matching simulation results with observed data, the non-linear relationship between fracture aperture and pressure was determined, providing a better understanding of fracture behavior in crystalline rock.
WATER RESOURCES RESEARCH
(2021)
Article
Thermodynamics
Shuyang Yu, Xuhua Ren, Jixun Zhang
Summary: This study introduced a fracture mark xi to reflect the active or failure mode of Smoothed Particle Hydrodynamics (SPH) particles, which can simulate rock progressive cracking characteristics. The solid-water interaction modes and the damaged particles - water particles transformation algorithms were embedded into traditional SPH program to simulate the water-stress coupling problems. The heat conduction equations were programmed into SPH to model the temperature-stress coupling problems.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
Jingyao Gao, Siyu Peng, Guangqi Chen, Yasuhiro Mitani, Hongyun Fan
Summary: Water inrush, a common geohazard during tunnel or mining excavation, can be mitigated and prevented through the study of the water-resistant stratum. This study adopts the discontinuous deformation analysis (DDA) coupled with hydro-mechanical method to understand the failure process of the water-resisting stratum. The simulation results depict the failure mechanism of the water-resisting structure and the coupled method shows great potential in studying practical engineering geohazards.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Multidisciplinary Sciences
D. Doolaeghe, C. Darcel, J-O Selroos, D. Mas Ivars, P. Davy
Summary: In crystalline bedrock, the open fraction of fracture network serves as the main pathways for fluids. The stress state is found to affect the open fraction, possibly indicating recent reactivation. By analyzing fracture data in Forsmark, Sweden, it is shown that the open fraction is mainly correlated to the normal stress acting on the fracture. The exceptions are the oldest fractures, which have a low open fraction regardless of the fluid pressure required for reactivation.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Chemical
Bin Yang, Honglin Xu
Summary: The study established a thermal-hydro-mechanical coupling model for deep-well drilling to investigate the impacts of drilling on temperature, pressure, and stress in the formation. The results showed that the temperatures in different horizontal stress directions were similar, but the pore pressure difference was significant. Increasing formation pressure led to higher in situ stress and reduced permeability, resulting in greater average effective stress at the bottomhole rock and lower drilling efficiency. Reducing wellbore pressure and temperature promoted tensile stress formation and improved drilling efficiency.
Article
Geochemistry & Geophysics
Juhani Suksi, Eva-Lena Tullborg, Ivan Pidchenko, Lindsay Krall, Bjorn Sandstrom, Kai Kaksonen, Tonya Vitova, Kristina O. Kvashnina, Joerg Goettlicher
Summary: The study found unusually high uranium concentrations in groundwater at the Forsmark site in eastern Sweden, which is believed to be caused by periodic water intrusions driven by glaciation and deglaciation events over the past 120 thousand years, leading to uranium redistribution in fractures.
Article
Multidisciplinary Sciences
D. Doolaeghe, C. Darcel, J. -O. Selroos, D. Mas Ivars, P. Davy
Summary: In crystalline bedrock, the open fraction of the fracture network is influenced by the state of stress and potential fluid pressure. A study conducted in Forsmark, Sweden, found that the open fraction is mainly correlated to the normal stress acting on the fracture. When the fluid pressure is hydrostatic, 100% of the fractures are open, but this ratio decreases exponentially to around 17% when the fluid pressure is lithostatic and above. The results suggest that past pressure build-ups, possibly related to glaciations, play a role in fracture reactivation.
SCIENTIFIC REPORTS
(2023)
Article
Computer Science, Interdisciplinary Applications
Xiao-Ping Zhou, Er-Bao Du, Yun-Teng Wang
Summary: This paper proposes a thermo-hydro-chemo-mechanical coupling peridynamic model for fractured rock mass to simulate fluid-driven crack, water pressure, and temperature characteristics. The model is validated by comparing with analytical solutions and previous numerical results, and shows good agreement with results obtained by the phase field method. The model is also used to simulate geothermal extraction process and investigate water pressure and thermal field distribution.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Mechanical
Jie Mei, Xiangchao Sheng, Lei Yang, Yaolei Zhang, Honghao Yu, Wanzhi Zhang
Summary: Under the long-term coupling effects of seepage pressure and geo-stress, the interaction and propagation of cracks in rock mass show typical time-dependent characteristics, directly controlling the failure mode of rock mass. The creep failure of rock mass with adjacent cracks presents a tension-shear composite mode, and the propagation of adjacent pre-existing cracks is non-uniform, with the interaction effect between cracks leading to the formation of a large number of micro cracks in the specimen.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Civil
Maria J. Gimeno, Eva-Lena Tullborg, Ann-Chatrin Nilsson, Luis F. Auque, Lino Nilsson
Summary: Numerous groundwater analyses have been conducted in the Forsmark area in Sweden, providing evidence of the presence of non-marine brackish to saline groundwaters with long residence times. These groundwaters have undergone complex mixing events from various water sources, resulting in a heterogeneous distribution of groundwater compositions.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Geological
Hong Zheng, Shiqi Cao, Wei Yuan, Quan Jiang, Shaojun Li, Guangliang Feng
Summary: This study investigates the time-dependent deformation of rock and its impact on permeability and deformation evolution in geological storage. A time-dependent hydro-mechanical coupling model is proposed to characterize the long-term influences of evolving permeability and deformation in a saline reservoir. The model is verified through experimental testing and simulation, showing its practicality and validity.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Geological
Jingren Zhou, Jinfu Lou, Jiong Wei, Feng Dai, Jiankang Chen, Minsi Zhang
Summary: A 3D microseismic data-driven damage model is proposed to accurately assess the damage evolution and crown pillar stability of jointed rock mass under hydro-mechanical coupling conditions. The model considers seepage, damage, and stress field effects, and optimizes the rock mass mechanical parameters using multiple factors. The results show that the damage pattern is controlled by the structure, water, and rock mass parameters, and it is more consistent with field observations.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Environmental Sciences
Renjie Teng, Xin Gu, Xiaozhou Xia, Qing Zhang
Summary: This study presents a comprehensive coupled thermal-hydro-mechanical model to investigate the frost heave mechanism of concrete-lined canals in a freeze-thaw environment. Unlike previous models, this model considers concrete as a porous medium and takes into account the effect of concrete pore structure, water content, ice content, and ice-water phase transition on the mechanical deformation of the canal. The freeze-thaw simulation of a canal is conducted and compared with experimental results, showing that the model accurately predicts the frost heave deformation of concrete-lined canals.