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Homogenization of a ductile porous sandstone with account of matrix pressure sensitivity

type de publication      communication internationale avec actes publiés
date de publication 2011
auteur(s) Lin Jian; Shen Wan Qing; Shao Jian-Fu; Kondo Djimédo
conférence The Second International Symposium on Computational Geomechanics (ComGeo II)
     dates de 27-04-2011 à 29-04-2011
     lieu Cavtat-Dubrovnik, Croatia
     nom des actes The Second International Symposium on Computational Geomechanics (ComGeo II)
pages 105 – 113
ISBN / ISSN 978-960-98750-1-1
résumé The present study aims at formulating and assessing a micromechanical model of porous rocks on a sandstone. The model takes advantage of a recently available homogenization-based macroscopic yield function which couples Drucker-Prager type plasticity of the solid matrix and evolving porosity. We first describe its formulation and implementation and applied then it to a Vosges sandstone. It is shown that, except for very low confining pressures for which the mechanical behavior is quasi-brittle, the model predicts well the ductile behavior at moderate or high confining pressures (in these cases the pore collapse mechanism is expected to play a dominant role).
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