This work focuses on the concurrent effects of stress and temperature changes on the opening and closure of cracks in porous rocks. A phenomenological approach is used to express the damaged tangent properties of rock. The model couples an anisotropic mechanical damage model initially designed for solids to an isotropic thermal damage model developed for salt rock. The solid mechanics damage model is improved according to the poro-mechanical thermodynamic framework. Deformation is decomposed into purely elastic, mechanically damaged, and thermally damaged strains. Thermal damage is defined so as to account both for crack opening and crack closure. Preliminary numerical results illustrate the importance of thermo-mechanical couplings on cracking. This research work is expected to bring new insights in thermo-hydro-mechanical damage modeling in unsaturated rocks, for possible applications on nuclear waste management.
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