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Conference papers
An anisotropic elastoplastic model for geomaterials and numerical implementation
Abstract : An anisotropic constitutive model is proposed in this paper accounting for both structural anisotropy and induced anisotropic plasticity. It is assumed that the rock is composed of a matrix and of potential planes of weakness. The matrix is assumed to be linear, transversely isotropic and the plasticity is described by a non linear yield function where the parameters are deduced from the nonlinear Hoek-Brown envelopes in pre- and post-peak, and derived from the laboratory characterization. A non-associated flow rule is used with a distinction between compression and extensional stress paths, as well as the absence of volumetric strain beyond large plastic distortion. The planes of weakness are considered as known a priori or assumed to be oriented perpendicular to the direction of the current minor principal stress. An elastic-perfectly plastic behavior according to the Mohr-Coulomb criterion is assumed in the planes of weakness; while the elastic part is considered as linear and transversely isotropic. Finally, the proposed model was implemented in FLAC3D and used to simulate triaxial compressions to provide a verification of the implementation. The applicability of the implemented model to reproduce damage (pre-peak) and/or failure developments around a circular opening is checked. The GCS drift, one of the mine-by experiments set up at the main level of the Meuse/Haute-Marne Underground Research Laboratory, is selected for this first application.
Cited literature [26 references]
https://hal-ineris.archives-ouvertes.fr/ineris-01855045
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Submitted on : Tuesday, September 4, 2018 - 2:54:45 PM
Last modification on : Wednesday, September 12, 2018 - 10:13:32 AM
Long-term archiving on: : Wednesday, December 5, 2018 - 6:30:54 PM
Contributor : Gestionnaire Civs Connect in order to contact the contributor
Submitted on : Tuesday, September 4, 2018 - 2:54:45 PM
Last modification on : Wednesday, September 12, 2018 - 10:13:32 AM
Long-term archiving on: : Wednesday, December 5, 2018 - 6:30:54 PM
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2015-097 post-print.pdf
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