An anisotropic elastoplastic model for geomaterials and numerical implementation

Mountaka Souley 1 Mehdi Ghoreychi 1 Jean-Bernard Kazmierczak 1 Gilles Armand 2 D. Seyedi 2
1 INERIS - Institut National de l'Environnement Industriel et des Risques
2 ANDRA - Agence Nationale pour la Gestion des Déchets Radioactifs
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.
Document type :
Conference papers
Complete list of metadatas

Cited literature [26 references]  Display  Hide  Download
https://hal-ineris.archives-ouvertes.fr/ineris-01855045
Contributor : Gestionnaire Civs <>
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

File

2015-097 post-print.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : ineris-01855045, version 1

Collections

INERIS

Citation

Mountaka Souley, Mehdi Ghoreychi, Jean-Bernard Kazmierczak, Gilles Armand, D. Seyedi. An anisotropic elastoplastic model for geomaterials and numerical implementation. 13. International congress of rock mechanics (ISRM 2015), May 2015, Montréal, Canada. ⟨ineris-01855045⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

17

Files downloads

8

Contact

CCSD