水–力耦合作用下页岩力学特性及其损伤本构模型研究

doi:10.13722/j.cnki.jrme.2022.0655

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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.

Key words： rock mechanics shale hydro-mechanical coupling strength characteristics failure characteristics damage constitutive relation

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	Articles by authors
	LIU Baoguo1
	YU Mingyuan1
	SUN Jinglai2
	HUANG Rui1
	DENG Tingbang1

Cite this article:

LIU Baoguo1,YU Mingyuan1,SUN Jinglai2, et al. Study on mechanical properties and damage constitutive model of shale under hydro-mechanical coupling[J]. , 2023, 42(5): 1041-1054.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0655 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I5/1041

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