Numerical analysis of multi-field coupling of barrier system in deep geological repository for high-level radioactive waste

被引：0
|
作者：
Zhao Y. [1 ,2 ]
Wu Z. [1 ]
Wang X. [3 ]
Hou W. [3 ]
Yang Q. [3 ]
Lü T. [3 ]
Hu D. [2 ,4 ]
Zhou H. [2 ,4 ]
Wei T. [2 ,4 ]
机构：
[1] School of Civil Engineering, Wuhan University, Wuhan
[2] State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan
[3] China Nuclear Power Engineering Co. Ltd., Beijing
[4] University of Chinese Academy of Sciences, Beijing
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2021年 / 52卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Deep geological disposal; Excavation damage; High-level radioactive waste; Multiphysics coupling problem; Unsaturated soil;
D O I：
10.11817/j.issn.1672-7207.2021.08.005
中图分类号：
学科分类号：
摘要：
A temperature-seepage coupling numerical model of the barrier system of high-level radioactive waste repository considering surrounding rock excavation damage was established and its rationality was verified. By analyzing the evolution of temperature and saturation at different research points, the influence of temperature gradient on the evolution of saturation of buffer/backfill materials was revealed. At the same time, the saturation and temperature evolution laws of each research point in the buffer/backfill material with different initial permeability of the surrounding rock were compared and analyzed, revealing the influence of the saturation process of the buffer/backfill material on the temperature evolution. Finally, the influence of the saturation and temperature evolution of the barrier system was compared and analyzed with and without considering the surrounding rock excavation damage. The results show that the temperature gradient will drive the water vapor to migrate from the high temperature area to the low temperature area, hindering the saturation process of the buffer/backfill material. The saturation process of the buffer backfill material will promote the heat transfer of the barrier system, which is more conducive to the safety and stability of the barrier system. Ignoring the damage of the surrounding rock will delay the saturation time of the buffer/backfill material, increase the maximum temperature of the surface of the disposal container, and make the safety assessment of the barrier system more conservative. © 2021, Central South University Press. All right reserved.
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页码：2557 / 2571
页数：14
相关论文
共 30 条
  • [1] LUO Sihai, QIAN Qihu, LI Jinxuan, Et al., Multi-field coupling and nuclide transport in HLW geological disposal repository, Rock and Soil Mechanics, 26, S1, pp. 264-270, (2005)
  • [2] WANG Ju, Geological disposal of high level radioactive waste in China: review and prospect, Uranium Geology, 25, 2, pp. 71-77, (2009)
  • [3] WANG Ju, Progress of geological disposal of high-level radioactive waste in China in the 21st century, Atomic Energy Science and Technology, 53, 10, pp. 2072-2082, (2019)
  • [4] WANG Ju, XU Guoqing, JIN Yuanxin, On the host rock for the geological repositories of high level radioactive waste, World Nuclear Geoscience, 23, 4, pp. 222-231, (2006)
  • [5] COLLIN F, LI X L, RADU J P, Et al., Thermo-hydro-mechanical coupling in clay barriers, Engineering Geology, 64, 2, pp. 179-193, (2002)
  • [6] CAI Guoqing, ZHAO Chenggang, TIAN Hui, Numerical simulation of coupled thermo-hydro-mechanical behavior for engineered barriers in high-level radioactive waste disposal, Chinese Journal of Geotechnical Engineering, 35, pp. 1-8, (2013)
  • [7] VECCHIA G D, ROMERO E., A fully coupled elastic-plastic hydromechanical model for compacted soils accounting for clay activity, International Journal for Numerical and Analytical Methods in Geomechanics, 37, 5, pp. 503-535, (2013)
  • [8] FERNANDEZ A M, VILLAR M V., Geochemical behaviour of a bentonite barrier in the laboratory after up to 8 years of heating and hydration, Applied Geochemistry, 25, 6, pp. 809-824, (2010)
  • [9] SUN Dean, MENG Delin, SUN Wenjing, Et al., Soil-water characteristic curves of two bentonites, Rock and Soil Mechanics, 32, 4, pp. 973-978, (2011)
  • [10] QIN Bing, CHEN Zhenghan, LIU Yuemiao, Et al., Characteristics of 3D swelling pressure of GMZ001 bentonite, Chinese Journal of Geotechnical Engineering, 31, 5, pp. 756-763, (2009)
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