A cross-anisotropic elastoplastic model applied to sedimentary rocks.
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Date
2020
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Abstract
Strength and deformability properties of sedimentary rocks are difficult to characterize as these geomaterials
show anisotropic mechanical behavior, which cannot be adequately evaluated by an isotropic constitutive
model. This essay proposes a cross-anisotropic elastoplastic model to evaluate stress–strain relationships of
sedimentary rocks. The approach couples the twelve-parameter Lade–Kim isotropic model with a non-uniform
scaling of the stress tensor and includes two scaling parameters that link the orientation of the bedding planes
with the loading direction. The anisotropic model parameters can be conveniently determined using Bayesian
analysis. We illustrate our method using triaxial tests on a variety of confining stresses and bedding plane
orientations for a travertine and a Tournemire shale. Our results demonstrate that the predicted maximum
deviatoric stresses and the simulated stress–strain curves are shown to be in good agreement with the measured
data.
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Keywords
Constitutive relations, Cross-anisotropic models, Triaxial tests, Inverse analysis
Citation
GAONA, J. H. F. et al. A cross-anisotropic elastoplastic model applied to sedimentary rocks. International Journal of Rock Mechanics & Mining Sciences, v. 132, 2020. Disponível em: <https://www.sciencedirect.com/science/article/pii/S1365160920303270>. Acesso em: 29 abr. 2022.