裂隙刚度随应力变化对双重孔隙介质热-水-应力耦合影响的有限元分析

›› 2012, Vol. 33 ›› Issue (11): 3426-3432.

裂隙刚度随应力变化对双重孔隙介质热-水-应力耦合影响的有限元分析

张玉军，徐刚，杨朝帅

中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，武汉 430071

收稿日期:2011-10-24 出版日期:2012-11-12 发布日期:2012-11-14
作者简介:张玉军，男，1956年生，博士，研究员，主要从事岩石力学与工程方面的研究工作
基金资助:
国家自然科学基金资助项目(No. 51079145)；国家重点基础研究发展计划（973）资助项目(No. 2010CB732101)

Finite element analysis of influence of fracture stiffness changing with stress on thermo-hydro-mechanical coupling in dual-porosity medium

ZHANG Yu-jun，XU Gang，YANG Chao-shuai

State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China

Received:2011-10-24 Online:2012-11-12 Published:2012-11-14

摘要/Abstract

摘要： 引入并修正了变刚度的连续屈服节理模型，同时考虑应力拉压和压力（化学）溶解对裂隙开度的综合影响，对所建立的双重孔隙-裂隙介质热-水-应力耦合有限元计算程序作了改进。通过一个假定的高放废物地质处置库的数值模拟，就岩体裂隙刚度变化的2种工况，分析了岩体中的温度、裂隙刚度、正应力、孔（裂）隙水压力和地下水流速的变化、分布情况。结果显示：与裂隙刚度是常数时相比，裂隙刚度是法向应力的函数时计算域中温度较低；岩体应力的大小也有一定不同，其分布与裂隙刚度“场”有明显的相似性；并且负孔（裂）隙水压力的绝对值要略小一点，约是常数时的98%。

关键词: 双重孔隙介质, 连续屈服节理模型, 热-水-应力耦合, 有限元分析

Abstract: Introducing and modifying the continuously yielding joint model, and simultaneously considering the composite impact of mechanical dilation/compaction and pressure solution on fracture aperture, the FEM code for analysis of the thermo-hydro- mechanical coupling in dual-porosity medium established by the first author was improved. Through the numerical simulations in which there were two patterns of changing the fracture stiffness for a hypothetical nuclear waste repository, the variations and distributions of temperatures, fracture stiffnesses, normal stresses, pore (fracture) pressures, flow velocities of groundwater were investigated. The results show: compared with the case of unchangeable fracture stiffness, the temperatures in the computing domain are lower in the case whose fracture stiffness is an exponential function of normal stress; the magnitudes of stresses within the rock mass in two cases are also some different, but the characteristics of stress distribution are similar to those of fracture stiffnesses obviously; and the negative pore (fracture) pressures in the case with changeable fracture stiffness are smallish (about 98% of case of unchangeable fracture stiffness).

Key words: dual-porosity medium, continuously yielding joint model, thermo-hydro-mechanical coupling, finite element analysis

中图分类号:

O 242

张玉军，徐刚，杨朝帅. 裂隙刚度随应力变化对双重孔隙介质热-水-应力耦合影响的有限元分析[J]. , 2012, 33(11): 3426-3432.

ZHANG Yu-jun，XU Gang，YANG Chao-shuai . Finite element analysis of influence of fracture stiffness changing with stress on thermo-hydro-mechanical coupling in dual-porosity medium[J]. , 2012, 33(11): 3426-3432.

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