A thermodynamically consistent framework for saturated viscoplastic rock-materials subject to damage

N. Dufour (1) , H. Wong (2) , C. Arson (3) , F. Deleruyelle (4) , Jean-Michel Pereira (5)

1 LGMNPN - Génétique moléculaire de la neurotransmission et des processus neurodégénératifs
2 (U 726) - Bioinformatique génomique et moléculaire
3 Zachry Department of Civil Engineering, Texas A and M University, United States
4 IRSN/DSU/SSIAD/BERIS - Bureau d'Expertise et de Recherche sur les Installations de Stockage
5 navier umr 8205 - Laboratoire Navier

The aim of this study is to build a thermodynamically consistent theoretical framework to model viscoplasticity and damage in saturated geomaterials. The induced anisotropic damage is represented by a second-order tensor. The key point of the model formulation is the definition of a "double effective stress", stemming from the concept of "damaged effective stress" (used in Continuum Damage Mechanics to couple damage and viscoplasticity in solids), and from the concept of "hydro-mechanical effective stress" (used in poromechanics to account for solid-fluid interactions). The dissipation potential is expressed as a function of the "double effective stress", which makes it possible to couple creep, fluid flow and damage in a consistent framework. © 2012 Elsevier Ltd. All rights reserved.

Mots clés: Thermodynamics; Viscoplasticity; Damage; Poromechanics; Couplings; Effective stress

Domaines: Sciences de l'ingénieur [physics]; Génie civil

N. Dufour, H. Wong, C. Arson, F. Deleruyelle, Jean-Michel Pereira. A thermodynamically consistent framework for saturated viscoplastic rock-materials subject to damage. Mechanics Research Communications, 2012, 45, pp.15-21. ⟨10.1016/j.mechrescom.2012.06.009⟩. ⟨hal-01157369⟩