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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摘要为了探究复杂水环境和应力状态下西域砾岩水敏效应和力学损伤演化规律，利用岩石多场耦合三轴伺服自动测试系统，开展不同含水率下单轴压缩试验、不同孔压和围压下水力耦合三轴压缩试验，探究含水率、孔隙水压力和应力状态对西域砾岩强度、变形参数、损伤特性和破坏机制的影响。结果表明：新疆喀什的西域砾岩具有低强度、易变形、低孔隙率、强水敏性等特性。随着含水率的增大，西域砾岩的弹性模量、变形模量以及特征应力均表现出软化现象，峰值强度软化系数约为0.77。孔压和围压对西域砾岩的非线性变形有极大的影响，高围压和孔压条件下强延性力学特征更为显著。对比不同强度准则，发现Drucker-Prager准则能够准确描述西域砾岩的力学特性演化，并基于裂纹体积应变分析西域砾岩的损伤程度。在干燥和天然状态下，砾岩的破坏形式主要为张拉破坏和压裂破坏，而在饱和状态下，会呈现张拉和剪切混合破坏。孔压和围压作用下西域砾岩的宏观失效面以剪切破坏为主，且剪切破坏角度整体随着孔压和围压的增大而减小。

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	段雪雷1
	2
	张强3
	曹亚军1
	2
	赵登锋4
	王伟1
	2
	朱其志1
	2
	刘世藩1
	2

关键词 ：岩石力学, 西域砾岩, 孔隙水压, 特征应力, 水敏效应, 非线性变形, 损伤演化

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

引用本文:

段雪雷1，2，张强3，曹亚军1，2，赵登锋4，王伟1，2，朱其志1，2，刘世藩1，2. 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[J]. 岩石力学与工程学报, 2024, 43(12): 2992-3004.
DUAN Xuelei1，2，ZHANG Qiang3，CAO Yajun1，2，ZHAO Dengfeng 4，WANG Wei1，2，ZHU Qizhi1，2，LIU Shifan1，2. Study on water sensitivity effect and mechanical damage characteristics of Xiyu conglomerate under complex water environment and stress condition. , 2024, 43(12): 2992-3004.

链接本文:

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

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