A review of self-sealing characteristics of clay rocks under coupled thermo-hydro-mechanical conditions

被引：0
|
作者：
Chen W. [1 ]
Lei J. [1 ,2 ]
Yu H. [1 ]
Li F. [1 ,2 ]
Ma Y. [1 ]
Wang J. [3 ]
机构：
[1] State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, Hubei
[2] University of Chinese Academy of Sciences, Beijing
[3] Ordos Zhuanlongwan Coal Company Ltd., Ordos, 017000, Inner Mongolia
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2019年 / 38卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Damage; EDZ; Permeability model of self-sealing; Radioactive waste disposalin clay rocks; Rock mechanics; Self-sealing;
D O I：
10.13722/j.cnki.jrme.2018.1411
中图分类号：
学科分类号：
摘要：
Clay rock is considered as an ideal medium for high-level radioactive waste geological repository due to its low permeability and self-sealing properties. The self-sealing properties of clay rocks can significantly reduce the permeability due to damage and hence prevent the radionuclide migration. The objective of this review is to discuss the state and development of the art in the self-sealing characteristics of clay rocks under coupled thermo-hydro-mechanical conditions from the aspects of experiment, mechanism and modeling investigations. The results show that the self-sealing characteristics of clay rocks are regulated by clay mineral content, stress state, water solution and temperature, etc. Based on the summary of advantages and disadvantages of the current experimental methods, a new transient approach is proposed to measure the permeability variation of clay rocks during the self-sealing process. The focuses of future researches, such as micro-mechanisms of self-sealing, self-sealing characteristics under coupled thermo-hydro-mechanical-chemical conditions, effects of creep development on self-sealing and self-sealing model establishment considering the evolution of permeability within excavation damage zones, are discussed. © 2019, Science Press. All right reserved.
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页码：1729 / 1746
页数：17
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