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An homogenization approach of advection and diffusion in cracked porous materials

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2001
auteur(s) Dormieux Luc; Lemarchand Eric
journal Journal of Engineering Mechanics
volume (numéro) 127 (12)
pages 1267 – 1274
résumé The present paper aims at studying the effect of microcracks opening on the diffusion and advection processes in a saturated porous medium. It is based on a micromechanical homogenization approach. The effects of porosity and microcracks are addressed in microscopic and mesoscopic levels to yield estimates of the effective diffusion and permeability tensors. Closed-form expressions and numerical results are obtained. For instance, the effect of the crack density parameter ? on the overall properties is discussed: (1) for a given value of ?, the maximum overall diffusion coefficient decreases for increasing values of crack radius; and (2) for large crack opening, the overall permeability is mainly controlled by ? and almost independent of the applied stress and the crack radius.
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