Creep Deformation and Gas Permeability in Fractured Claystone Under Various Stress States

被引：0
作者：
X. Chen
S. Y. Xie
W. Zhang
G. Armand
J. F. Shao
机构：
[1] Hohai University,Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering
[2] University of Lille,undefined
[3] CNRS,undefined
[4] Centrale Lille,undefined
[5] UMR9013-LaMcube,undefined
[6] Andra,undefined
来源：
Rock Mechanics and Rock Engineering | 2022年 / 55卷
关键词：
Gas permeability; Direct shear test; Creep; Confining pressure; claystone;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Clayey rocks with low permeability are investigated as a potential geological barrier for underground disposal of radioactive waste. Subjected to thermo-hydromechanical loads, damaged zones can be created around underground structures. It is crucial to investigate the evolution of permeability in those critical zones. In this study, an original experimental study is performed on the Callovo-Oxfordian (COx) claystone investigated in the French radioactive waste disposal project. A cylindrical sample is first subjected to a confining pressure, then to different values of shear stress until the creation of a planar fracture along the height. Creep tests are conducted under the different steps of shear stress. Gas permeability is also measured during the creep phases. Unloading–reloading steps of confining pressure are further realized to investigate the gas permeability change of fractured sample. The correlation between gas permeability variation and fracture opening is analyzed.
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页码：1843 / 1853
页数：10
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