| 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 |
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| 引用本文： | 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].岩土力学,2012,33(11):3426-3432. |
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| 作者姓名： | 张玉军 徐刚 杨朝帅 |
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| 作者单位： | 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 |
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| 基金项目： | 国家自然科学基金资助项目，国家重点基础研究发展计划(973)资助项目 |
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| 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%。
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| 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 |
| 收稿时间： | 2011-10-24 |
Finite element analysis of influence of fracture stiffness changing with stress on thermo-hydro-mechanical coupling in dual-porosity medium |
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| ZHANG Yu-jun
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XU Gang
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YANG Chao-shuai.Finite element analysis of influence of fracture stiffness changing with stress on thermo-hydro-mechanical coupling in dual-porosity medium[J].Rock and Soil Mechanics,2012,33(11):3426-3432. |
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| Authors: | ZHANG Yu-jun XU Gang YANG Chao-shuai |
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| Institution: | State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
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| 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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| Keywords: | dual-porosity medium continuously yielding joint model thermo-hydro-mechanical coupling finite element analysis |
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