| 考虑开挖损伤的高放废物地质处置库温度-渗流-应力耦合数值模拟方法 |
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| 引用本文： | 侯会明,胡大伟,周辉,卢景景,吕涛,张帆.考虑开挖损伤的高放废物地质处置库温度-渗流-应力耦合数值模拟方法[J].岩土力学,2020,41(3):1056-1064. |
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| 作者姓名： | 侯会明 胡大伟 周辉 卢景景 吕涛 张帆 |
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| 作者单位： | 1. 中国科学院武汉岩土力学研究所 岩土力学和工程国家重点实验室，湖北 武汉 430071；2. 中国科学院大学 北京 100049；
3. 中国核电工程有限公司 北京 100840；4. 湖北工业大学 土木建筑与环境学院，湖北 武汉 430064 |
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| 基金项目： | 国家重点研发计划资助（No.2018YFC0809601）；国家自然科学基金资助项目（No.51779252）；湖北省技术创新专项（重大项目）（No.2017AAA128）。 |
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| 摘 要： | 高放废物地质处置库处于温度?渗流?应力（THM）多场耦合环境中，对高放废物处置库进行安全评估时，需进行多场耦合分析。然而，高放废物处置库开挖引起硐壁附近围岩应力重分布，产生损伤，导致围岩热学参数（T）、渗流参数（H）和力学参数（M）发生变化，且在空间上分布不均匀，这将会对运营期处置库THM耦合演化过程产生显著影响。通过分析高放废物处置库温度?渗流?应力三场的耦合原理和处置库围岩损伤的分布和演化规律，定义了损伤变量和损伤演化准则，并将损伤变量与热学参数、渗流参数、力学参数以及多场耦合参数（Biot系数、Biot模量和温度排水系数）建立联系，将围岩损伤与温度?渗流?应力建立联系，形成了一个弹塑性损伤温度?渗流?应力多场耦合数值模型，然后利用建立的模型对瑞士Mont Terri高放废物地质处置库围岩加热试验进行模拟，对比了模拟值和试验值，比较了考虑开挖损伤和不考虑开挖损伤对高放废物地质处置库温度?渗流?应力的影响，并分析了在多场耦合作用下开挖损伤的演化规律。
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| 关 键 词： | 高放废物 屏障系统 多场耦合 弹塑性 开挖损伤 |
| 收稿时间： | 2019-03-04 |
| 修稿时间： | 2019-08-01 |
Thermo-hydro-mechanical coupling numerical simulation method for high-level waste geological repository considering excavation damage |
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| HOU Hui-ming,HU Da-wei,ZHOU Hui,LU Jing-jing,Lü Tao,ZHANG Fan.Thermo-hydro-mechanical coupling numerical simulation method for high-level waste geological repository considering excavation damage[J].Rock and Soil Mechanics,2020,41(3):1056-1064. |
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| Authors: | HOU Hui-ming HU Da-wei ZHOU Hui LU Jing-jing LÜ Tao ZHANG Fan |
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| Institution: | 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. China Nuclear Power Engineering Co., Ltd., Beijing 100840, China;
4. School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, Hubei 430064, China |
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| Abstract: | The high-level waste geological repository is in a multi-field coupling environment of thermo-hydro-mechanics (THM), and multi-field coupling analysis is required when performing safety assessment on the high-level waste repository. However, the excavation of the high-level waste repository caused the stress redistribution of the surrounding rock near the wall, consequently generated damage and resulted in changes in the thermal parameters (T), seepage parameters (H) and mechanical parameters (M) of the surrounding rock, and their spatial distributions are not homogeneous, which will have a significant impact on the THM coupling evolution process during the operational period. By analyzing the coupling mechanism of thermo-hydro-mechanics of high-level waste repository, and the distribution and evolution law of surrounding rock damage in repository, the damage variable and damage evolution criterion are defined. The damage variable is related to thermal parameters, seepage parameters, mechanical parameters and multi-field coupling parameters (Biot coefficient, Biot modulus and temperature drainage coefficient) and then the damage of surrounding rock is linked with thermo-hydro-mechanical fields. An elastoplastic damage thermo-hydro-mechanical multi-field coupling numerical model is established. Then, the established model is used to simulate the surrounding rock heating test of the high-level waste geological repository in Mont Terri, Switzerland. The numerical and experimental values are compared, the effect of excavation-induced damage on evolution of temperature field, seepage field and stress field are discussed, and the evolution law of excavation-induced damage under multi-field coupling is also analyzed. |
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| Keywords: | high-level radioactive waste barrier system multiphysics coupling problem elastoplastic excavation damage |
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