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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摘要通过开展不同渗透水压力与三轴压缩作用下的页岩试验，分析页岩的变形、强度和破坏特征，建立考虑渗透压作用的页岩全应力–应变损伤本构模型。结果表明：(1) 在常规三轴压缩和渗透水压力共同作用下，页岩的强度明显弱化，残余强度受渗透压的影响较大。(2) 在不同围压和渗透水压力作用下，页岩从剪切破坏到拉剪复合破坏再到陡倾角剪切破坏，共计产生5种不同的剪切破坏形式。(3) 在常规三轴压缩和渗透水压力共同作用下，页岩强度仍满足M-C强度准则，但内摩擦角和黏聚力均随渗透压力的增大而降低。(4) 建立能够反映页岩在不同围压和渗透压作用下的应力–应变全过程的损伤本构模型，并可通过总损伤变量–应变曲线预测页岩的残余强度，理论曲线与试验数据吻合较好。

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	刘保国1
	于明圆1
	孙景来2
	黄芮1
	邓廷邦1

关键词 ：岩石力学, 页岩, 水&ndash, 力耦合, 强度特性, 破坏特征, 损伤本构关系

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

引用本文:

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.

链接本文:

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

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