[en] The paper presents the enhancement of an existing constitutive model for argillaceous hard soils-weak rocks to incorporate non-isothermal conditions to be used in coupled thermo-hydro-mechanical (THM) simulations of underground excavations subjected to temperature variations within the context of deep geological nuclear waste disposal. The proposed thermo-elastoplastic extension accounts for the effect of temperature on the yield and plastic potential functions and on the elastic stiffness. The resulting model is validated through the simulation of relevant non-isothermal laboratory tests reported in the literature. The model is then applied to the coupled THM simulation of an in situ heating test conducted at the Meuse/Haute-Marne underground research laboratory in Bure, France, excavated in the Callovo-Oxfordian claystone. Results show that the incorporation of thermal effects into the constitutive description of the host rock plays a significant role in the behaviour of the excavation when subjected to thermal loading, particularly in the evolution of the excavation fractured zone.
Disciplines :
Civil engineering
Author, co-author :
TOURCHI, Saeed ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Engineering (DoE) ; Institute of Hydrogeology, Engineering Geology and Applied Geophysics, Faculty of Science, Charles University, Prague, Czech Republic
Mánica, Miguel A. ; Institute of Engineering, National Autonomous University of Mexico, Mexico City, Mexico
Gens, Antonio; Department of Civil and Environmental Engineering, Universitat Politècnica de Catalunya, Barcelona Tech, Cimne, Barcelona, Spain
Vaunat, Jean; Department of Civil and Environmental Engineering, Universitat Politècnica de Catalunya, Barcelona Tech, Cimne, Barcelona, Spain
Vu, Minh-Ngoc; Andra R&d, Châtenay-Malabry, France
Armand, Gilles; Meuse/Haute-Marne Underground Research Laboratory, Andra R&d, Bure, France
External co-authors :
yes
Language :
English
Title :
A thermomechanical model for argillaceous hard soils-weak rocks: application to THM simulation of deep excavations in claystone
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