Journal
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
Volume 39, Issue 3, Pages 637-648Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0020-7683(01)00110-X
Keywords
inherent anisotropy; microstructure tensor; sedimentary rocks; plasticity
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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, which specifies the directional dependence of strength parameters. The mathematical formulation is applied to model the mechanical characteristics of Tournemire shale. Several triaxial tests are simulated, at various initial confining pressures, for samples tested at different orientation relative to the loading direction. The results are compared with the available experimental data. (C) 2002 Elsevier Science Ltd. All rights reserved.
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