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Study of desaturation and resaturation in brittle rock with anisotropic damage

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2005
auteur(s) Shao Jian-Fu; Ata N.; Ozanam O.
journal (abréviation) Engineering Geology (Eng Geol)
volume (numéro) 81 (3)
pages 341 – 352
résumé This paper deals with numerical modelling of anisotropic damage induced by desaturation and resaturation processes in a brittle rock. This study is conducted in the framework of geological barrier safety analysis for deep disposal of nuclear waste. A non-linear poroelastic model coupled with anisotropic damage is proposed for constitutive modelling of unsaturated rock. A fully coupled FEM method is used for modelling of hydromechanical coupling problems. Instantaneous phase change without dissipation between water liquid phase and vapour is included. Parametric studies are performed to investigate influences of main factors involved in such processes. Rock damage induced by excavation, desaturation and resaturation is evaluated. Finally, we analyse the importance of taking into account the correlation between induced damage and rock permeability.
mots clés Mudstone; Unsaturated rock; Desaturation; Damage; Microcracks; Waste disposal
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