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Micromechanical study of damage growth and permeability variation in brittle rocks

type de publication      article in an international journal with refereeing comitee
date de publication 2006
auteur(s) Zhou Jianjun; Shao Jian-Fu; Lydzba Dariusz
journal (abréviation) Studia Geotechnica et Mechanica (Studia Geotechnica et Mechanica)
volume (numéro) 28 (1)
pages 61 – 73
résumé This paper presents a coupled model for anisotropic damage and permeability evolution by using a micro-macro approach. The damage state is represented by a space distribution of microcrack density. The evolution of damage is directly linked to the propagation condition of microcracks. The macroscopic free enthalpy function of cracked material is obtained by using micromechanical considerations. It is assumed that the microcracks exhibit normal aperture which is associated with the crack growth due to the asperity of crack faces. By using Darcy’s law for macroscopic fluid flow and assuming laminar flow in microcracks, the overall permeability of the representative volume element is obtained by an averaging procedure taking into account the contribution of crack aperture in each orientation.
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