An elastoviscoplastic constitutive model for geomaterials: Application to hydromechanical modelling of claystone response to drift excavation

An isotropic elastoviscoplastic constitutive model based on a generalized Hoek-Brown criterion is proposed. The plastic mechanism is characterized by a positive and a negative hardening, and a specific non-associated flow rule allows to take into account the evolution of the dilatancy. Several hydro...

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Bibliographic Details
Published in:Computers and geotechnics 2017-05, Vol.85, p.321-340
Main Authors: Cuvilliez, Sam, Djouadi, Inès, Raude, Simon, Fernandes, Roméo
Format: Article
Language:English
Subjects:
Claystone excavations
Code_Aster
Computer simulation
Constitutive model
Dilatancy
Dredging
Drift
Excavation
Finite element analysis
Finite element method
Geomaterials
Hardening
Laboratories
Localization
Mathematical models
Modelling
Nuclear waste disposal
Plastics
Regularization
Regularization technique
Viscoplasticity
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Summary:An isotropic elastoviscoplastic constitutive model based on a generalized Hoek-Brown criterion is proposed. The plastic mechanism is characterized by a positive and a negative hardening, and a specific non-associated flow rule allows to take into account the evolution of the dilatancy. Several hydromechanical finite element simulations corresponding to realistic configurations of drift excavations in the underground research laboratory of Bure are presented. Regularization techniques are required to avoid localization phenomena due to softening. A second gradient formulation has been used as it is well suited for dilatant materials such as claystone. Numerical results are discussed and compared with experimental measurements.
ISSN:0266-352X
1873-7633
DOI:10.1016/j.compgeo.2016.08.004