Published 4 issues per year
ISSN Print: 2151-4798
ISSN Online: 2151-562X
Indexed in
USING A GEO-MECHANICAL DAMAGE MODEL TO ASSESS PERMEABILITY IN CRACKED POROUS MEDIA: INTERNAL LENGTH PARAMETER ISSUES
ABSTRACT
The THHMD model is a thermo-hydro-mechanical damage model dedicated to unsaturated rocks. The present article questions one of the postulates of the model's formulation, namely using the same Representative Elementary Volume (REV) to define the crack density tensor and to compute the damaged permeability. In this study a drained triaxial compression test is simulated by considering that the REV's dimension (noted b) is a flow internal length. We show that the length b can be used to scale the influence of damage on permeability. Secondly, a nuclear waste repository is modeled. Multiphase flow is studied in fractured porous bedrock subjected to heating. It is demonstrated that (1) the THHMD model is mesh-independent, (2) b can be considered as the homogenization scale necessary to define the damage field, and (3) the model can be improved by adding one internal length parameter in the formulation.
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Xu Hao, Arson Chloé, Mechanistic Analysis of Rock Damage Anisotropy and Rotation Around Circular Cavities, Rock Mechanics and Rock Engineering, 48, 6, 2015. Crossref
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Xu Hao, Prévost Jean H., Integration of a continuum damage model for shale with the cutting plane algorithm, International Journal for Numerical and Analytical Methods in Geomechanics, 41, 4, 2017. Crossref
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Arson Chloé, Medina-Cetina Zenon, Bayesian paradigm to assess rock compression damage models, Environmental Geotechnics, 2, 3, 2015. Crossref