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《岩石力学与岩土工程学报(英文版)》 2018-05
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Thermo-hydro-mechanical behavior of clay rock for deep geological disposal of high-level radioactive waste

Chun-Liang Zhang;Gesellschaft für Anlagen- und Reaktorsicherheit (GRS), Repository Safety Research Division;  
In the context of deep geological disposal of radioactive waste in clay formations, the thermo-hydromechanical(THM) behavior of the indurated Callovo-Oxfordian and Opalinus clay rocks has been extensively investigated in our laboratory under repository relevant conditions:(1) rock stress covering the range from the lithostatic state to redistributed levels after excavation;(2) variation of the humidity in the openings due to ventilation as well as hydraulic drained and undrained boundary conditions;(3)gas generation from corrosion of metallic components within repositories; and(4) thermal loading from high-level radioactive waste up to the designed maximum temperature of 90℃ and even beyond to150℃. Various important aspects concerning the long-term barrier functions of the clay host rocks have been studied:(1) fundamental concept for effective stress in the porous clay-water system;(2) stressdriven deformation and damage as well as resulting permeability changes;(3) moisture influences on mechanical properties;(4) self-sealing of fractures under mechanical load and swelling/slaking of clay minerals upon water uptake;(5) gas migration in fractured and resealed claystones; and(6) thermal impact on the hydro-mechanical behavior and properties. Major findings from the investigations are summarized in this paper.
【Fund】: funded by the German Federal Ministry for Economic Affairs and Energy(BMWi)under contract number02E10377
【CateGory Index】: X771;TU45
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