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A two scale model of porous rocks with Drucker-Prager matrix: application to a sandstone

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2011
auteur(s) Lin Jian; Shao Jian-Fu; Kondo Djimédo
journal (abréviation) Mechanics Research Communications (Mech Res Comm)
volume (numéro) 38 (8)
  
pages 602 – 606
résumé The present paper is devoted to a micromechanical model of porous rocks and its application to a sandstone. This original model takes advantage of a recent homogenization-based macroscopic yield function which couples Drucker-Prager type plasticity of the solid matrix and evolving porosity. Its formulation and implementation are described. Application to a Vosges sandstone shows 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 (for which the pore collapse mechanism is expected to play a dominant role).
mots clés Drucker-Prager matrix; Ductile behavior; micromechanics; Gurson-type model; porous rocks; triaxial compression tests
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