考虑双重孔隙–裂隙岩体中强度异向性的THM耦合有限元分析

doi:10.13722/j.cnki.jrme.2014.0107

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摘要计入裂隙连通率，进一步完善了确定双重孔隙–裂隙介质岩体的黏聚力及内摩擦角的方法，将其引入独立开发的热–水–应力耦合二维弹塑性有限元程序中。假定一个位于饱和岩体中的实验室尺度的核废物地质处置库模型，以此为计算背景，拟定裂隙组正交和斜交的二种情况，进行热–水–应力耦合有限元分析。结果表明：与裂隙组正交时的各场量呈轴对称分布相比，两组裂隙斜交时，孔隙水压力及其流速呈轴对称分布，但岩体中的应力场、裂隙水压力及其流速、塑性区均呈非轴对称分布；裂隙组正交时岩体中的塑性区大面积出现，而裂隙组斜交时岩体中几乎无塑性区产生；岩体中裂隙组的产状强烈地影响到应力场、塑性区和裂隙水的状态。

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关键词 ：岩石力学, 双重孔隙&ndash, 裂隙介质, 强度异向性, 弹塑性模型, 热&ndash, 水&ndash, 应力耦合, 有限元分析

Abstract：A method of determining the cohesion and internal friction angle of a dual-pore-fracture rock mass was improved by considering fracture connection ratio，and this method was introduced into the elasto-plastic thermo-hydro-mechanical(THM) coupling finite element method(FEM) code. Aiming at a model of hypothetical nuclear waste repository in a saturated dual-pore-fracture rock mass with a laboratory scale，the THM coupling FEM analyses were carried out for two assumed cases with orthogonal fracture sets and oblique-cross fracture sets，respectively. The results show that：compared with the axisymmetric distributions of various field quantities in the case with orthogonal fracture sets，the distributions of pore pressures and flow velocities of underground water are axisymmetric，but the distributions of stresses，fracture pressures and relative flow velocities，plastic zones in the rock mass are non-axisymmetric for the case with oblique-cross fracture sets. A large area of plastic zone occurs in the case with orthogonal fracture sets，but almost no plastic zone is produced in the case with oblique-cross fracture sets. The occurrence of fracture sets strongly influences the states of stress，plastic zone and fracture pressure in rock mass.

Key words： rock mechanics dual-pore-fracture medium strength anisotropy elasto-plastic model thermo- hydro-mechanical coupling FEM analysis

引用本文:

张玉军1，张维庆2. 考虑双重孔隙–裂隙岩体中强度异向性的THM耦合有限元分析[J]. 岩石力学与工程学报, 2015, 34(s1): 2759-2766.
ZHANG Yujun1，ZHANG Weiqing2. FEM ANALYSES FOR THM COUPLING IN DUAL-PORE-FRACTURE ROCK MASS CONSIDERING STRENGTH ANISOTROPY. , 2015, 34(s1): 2759-2766.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.0107 或 https://rockmech.whrsm.ac.cn/CN/Y2015/V34/Is1/2759

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