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

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

更新时间：2026-06-25

- Finite element analysis of influence of fracture stiffness changing with stress on thermo-hydro-mechanical coupling in dual-porosity medium
- Vol. 33, Issue 11, (2012)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：
  CLC： O242
- Online First：14 November 2012，
  
  Published：2012
- 稿件说明：
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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).
DOI：

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). DOI：

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%。

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).

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