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Modelling of inherent anisotropy in sedimentary rocks

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2002
auteur(s) Pietruszczak S.; Lydzba Dariusz; Shao Jian-Fu
journal International Journal of Solids ans Structures
volume (numéro) 39 (3)
  
pages 637 – 648
résumé This paper presents a constitutive relation for modelling the inelastic response of sedimentary rocks. The inherent anisotropy of this class of materials is described by employing a second-order microstructure tensor, whose eigenvectors define the principal material triad. Higher-order dyadic products of this tensor are incorporated in the distribution function, wich specifies the directional dependence of strength parameters. The mathematical formulation is applied to model the mechanical characteristics of Tournemire shale. Several triaxial test are simulated, at various initial confining pressures, for samples tested at different orientation relative to the loading direction. The results are compared with the aviable experimental data.
mots clés Inherent anisotropy; Microstructure tensor; Sedimentary rocks; Plasticity
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