复杂水环境–应力状态下西域砾岩水敏效应与力学损伤特性研究

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Abstract To investigate the water sensitivity effect and mechanical damage evolution of Xiyu conglomerate subjected to complex water environment and stress state，adopting the rock multi-field coupled triaxial servo automatic testing system，a series of uniaxial compression tests under varying water contents，and triaxial compression tests under varying pore and confining pressures were carried out. The effects of water content，pore pressure and stress state on the strength，deformation parameters，damage characteristics and failure mode were analyzed. The results show that Xiyu conglomerate in Kashgar，Xinjiang has the characteristics of low mechanical strength，high deformability，low porosity and strong water sensitivity. An increase of water content results in the decrease of elastic modulus，deformation modulus and characteristic stresses of Xiyu conglomerate，and its peak strength?s softening coefficient is around 0.77. The nonlinear deformation of Xiyu conglomerate is significantly impacted by confining and pore pressures，exhibiting robust ductility mechanical behavior at elevated levels of these pressures. Compared with other strength criteria，Drucker-Prager criterion can accurately describe the evolution of mechanical properties for Xiyu conglomerate，and the damage is analyzed based on crack volume strain. In the dry natural state，the failure modes of Xiyu conglomerate are mainly tensile and fracturing failure，while in the saturated state，tensile and shear mixed failure will occur. With increasing pore and confining pressures，the macroscopic failure mode is mainly shear failure，and its shear failure angle decreases.

Key words： rock mechanics Xiyu conglomerate pore pressure characteristic stress water-sensitive effect nonlinear deformation damage evolution

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	Articles by authors
	DUAN Xuelei1
	2
	ZHANG Qiang3
	CAO Yajun1
	2
	ZHAO Dengfeng 4
	WANG Wei1
	2
	ZHU Qizhi1
	2
	LIU Shifan1
	2

Cite this article:

DUAN Xuelei1,2,ZHANG Qiang3, et al. Study on water sensitivity effect and mechanical damage characteristics of Xiyu conglomerate under complex water environment and stress condition[J]. , 2024, 43(12): 2992-3004.

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https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I12/2992

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