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A micromechanical model of inherently anisotropic rocks

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2015
auteur(s) Shen Wan Qing; Shao Jian-Fu
journal (abréviation) Computers and Geotechnics (Computers and Geotechnics)
volume (numéro) 65
pages 73 – 79
résumé A micromechanical elastoplastic model is proposed in this study for anisotropic sedimentary rocks. With a two-step homogenization procedure, a macroscopic criterion is established for geomaterials made up of a porous matrix reinforced by rigid inclusions. The effects of porosity, inclusions and the inherent anisotropy are explicitly taken into account. Based on [18], a scalar anisotropy parameter is introduced to describe the anisotropic characteristics of the material. With a non-associated plastic flow rule and a strain hardening law, the proposed model is applied to describe the macroscopic mechanical behavior of Tournemire shale with different initial confining pressures and different loading orientations. Comparing numerical results with experimental data, the efficiency of the proposed micromechanical model is assessed and verified.
mots clés Multiscale modeling; Inherent anisotropy; Microstructure tensor; Clayey rocks; Plastic deformation
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