Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

The importance of Thermo-Hydro-Mechanical couplings and microstructure to strain localization in 3D continua with application to seismic faults. Part I: Theory and Linear Stability Analysis

Abstract : A Thermo-Hydro-Mechanical (THM) model for Cosserat continua is developed to explore the influence of frictional heating and thermal pore fluid pressurization on the strain localization phenomenon. A general framework is presented to conduct a bifurcation analysis for elasto-plastic Cosserat continua with THM couplings and predict the onset of instability. Furthermore, the presence of an internal length in Cosserat continua enables to estimate the thickness of the localization zone. This is done by performing a linear stability analysis of the system and looking for the selected wavelength corresponding to the instability mode with fastest finite growth coefficient. These concepts are applied to the study of fault zones under fast shearing. For doing so, we consider a model of a sheared saturated infinite granular layer. The influence of THM couplings on the bifurcation state and the shear band width is investigated. Taking representative parameters for a centroidal fault gouge, the evolution of the thickness of the localized zone under continuous shear is studied. Furthermore, the effect of grain crushing inside the shear band is explored by varying the internal length of the constitutive law.
Liste complète des métadonnées

Littérature citée [69 références]  Voir  Masquer  Télécharger

https://hal-enpc.archives-ouvertes.fr/hal-01728833
Contributeur : Ioannis Stefanou <>
Soumis le : lundi 12 mars 2018 - 10:09:24
Dernière modification le : vendredi 17 juillet 2020 - 17:09:08
Archivage à long terme le : : mercredi 13 juin 2018 - 12:50:17

Fichier

Rattez, Stefanou, Sulem_2018_T...
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

Citation

Ioannis Stefanou, Hadrien Rattez, Jean Sulem. The importance of Thermo-Hydro-Mechanical couplings and microstructure to strain localization in 3D continua with application to seismic faults. Part I: Theory and Linear Stability Analysis. Journal of the Mechanics and Physics of Solids, Elsevier, In press, ⟨10.1016/j.jmps.2018.03.004⟩. ⟨hal-01728833⟩

Partager

Métriques

Consultations de la notice

266

Téléchargements de fichiers

319