Experimental study on triaxial shear-seepage of red sandstone under different confining pressures and water pressures
ZHAO Chengye1，2，LIANG Zhengzhao1，2，ZHANG Peisen3，4，TANG Shibin1，2，CHEN Fan1，2，#br#
SONG Wencheng1，2
(1. State Key Laboratory of Coastal and Offshore Engineering，Dalian University of Technology，Dalian，Liaoning 116024，China；2. Center of Rock Instability and Seismicity Research，Dalian University of Technology，Dalian，Liaoning 116024，China；3. National Key Laboratory for Mine Disaster Prevention and Control，Shandong University of Science and Technology，Qingdao，Shandong 266590，China；4. National Demonstration Center for Experimental Mining Engineering Education，Shandong University of Science and Technology，Qingdao，Shandong 266590，China)
Abstract：For the study of shear cracking in red sandstone and the mechanical and seepage behaviours before and after shear failure，standard cylindrical specimens underwent shear tests in a triaxial stress environment. The tests utilized the Rock Top multi-field coupling test system and a self-made shear diversion component. Different confining pressures and permeability pressure differentials were applied to investigate red sandstone's triaxial shear-seepage behaviour. Additionally，discrete element particle methods were employed to study the shear cracking process in models of different sizes and shapes. The research findings indicate: The pre-peak shear stress exhibits a linear increase with shear deformation. Post-peak shear and circumferential deformation rates accelerate，with 1 to 3 stress drops observed. Higher confining pressure leads to a steeper pre-peak deformation curve，increased final shear deformation，and a smoother circumferential deformation-shear displacement curve，with concentrated peak circumferential deformation. The shear-seepage process is categorized into stages of seepage interruption，seepage state transition，and increasing seepage velocity. Characteristic values of shear stress demonstrate a linear relationship with confining pressure. Rock samples display macroscopic single shear plane failure. Increased confining pressure results in more severe fragmentation of the fracture edge and larger shear cracks at the ends. Seepage rates before and after shear failure follow a power-law decrease with confining pressure. Seepage rates exhibit a strong linear relationship with permeability pressure differential. The slope of the flow rate-permeability pressure differential fitting curve decreases with increasing confining pressure. Post-unloading seepage rate is one order of magnitude lower than the pre-unloading rate，with the difference gradually decreasing with increasing confining pressure. Simulation results align with experiments，revealing oblique shear cracks under both confining and normal constraints. The angle and density of oblique shear cracks are influenced by the length-to-diameter ratio and volume，with the least impact at a three-dimensional size ratio of 1. Under equal size ratios，triaxial shear strength is weaker than direct shear strength. The results of this triaxial shear test demonstrate reliability in both methods and outcomes.
赵成业1，2，梁正召1，2，张培森3，4，唐世斌1，2，陈 凡1，2，宋文成1，2. 不同围压与水压下红砂岩三轴剪切–渗流试验研究[J]. 岩石力学与工程学报, 2024, 43(4): 862-877.
ZHAO Chengye1，2，LIANG Zhengzhao1，2，ZHANG Peisen3，4，TANG Shibin1，2，CHEN Fan1，2，. Experimental study on triaxial shear-seepage of red sandstone under different confining pressures and water pressures. , 2024, 43(4): 862-877.
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2024, Vol. 43 
