Study on mechanical properties and damage constitutive model of shale under hydro-mechanical coupling
LIU Baoguo1，YU Mingyuan1，SUN Jinglai2，HUANG Rui1，DENG Tingbang1
(1. School of Civil Engineering，Beijing Jiaotong University，Beijing 100044，China；
2. Beijing Municipal Engineering Research Institute，Beijing 100037，China)
Abstract：By the tests of shale under different water osmotic pressures and triaxial compression，the deformation，strength and failure characteristics of shale are analyzed，and a full stress-strain damage constitutive model of shale considering osmotic pressure is established. The results show that：(1) under the combined action of conventional triaxial compression and water seepage pressure，the strength of shale has obvious weakening effect，and its residual strength is more affected by seepage pressure. (2) Under the action of different confining pressures and water seepage pressures，five different shear failure forms are produced in shale from shear failure to tension shear composite failure and then to steep angle shear failure. (3) Under the combined action of conventional triaxial compression and water seepage pressure，the shale strength still meets the M-C strength criterion，but the internal friction angle and cohesion decrease with the increase of water seepage pressure. (4) A damage constitutive model that can reflect the whole stress-strain process of shale under different confining pressures and osmotic pressures is established，and the residual strength of shale can be predicted by the corresponding axial strain value at the inflection point of the total damage variable curve D=1. The theoretical curve is in good agreement with the test data.
刘保国1，于明圆1，孙景来2，黄 芮1，邓廷邦1. 水–力耦合作用下页岩力学特性及其损伤本构模型研究[J]. 岩石力学与工程学报, 2023, 42(5): 1041-1054.
LIU Baoguo1，YU Mingyuan1，SUN Jinglai2，HUANG Rui1，DENG Tingbang1. Study on mechanical properties and damage constitutive model of shale under hydro-mechanical coupling. , 2023, 42(5): 1041-1054.
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2023, Vol. 42 
