A two scale model of porous rocks with Drucker-Prager matrix: Application to a sandstone |
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Authors: | J LinJ-F Shao D Kondo |
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Institution: | a Institut de Mécanique des Fluides et des Solides, Université de Strasbourg, 67000 Strasbourg, France b Laboratoire de Mécanique de Lille, UMR 8107 CNRS, USTL, 59655 Villeneuve d’Ascq, France c Institut D’Alembert, UMR 7190 CNRS, Université Pierre Et Marie Curie (UPMC), 75005 Paris Cedex, France |
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Abstract: | 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). |
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Keywords: | Drucker-Prager matrix Ductile behavior Micromechanics Gurson-type model Porous rocks Triaxial compression tests |
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