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 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of the Mechanics and Physics of Solids Année : 2018

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

(1) , (2) , (1)
1
2
Ioannis Stefanou
Hadrien Rattez
  • Fonction : Auteur
Jean Sulem

Résumé

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.
Fichier principal
Vignette du fichier
Rattez, Stefanou, Sulem_2018_Thermo-hydro mechanical couplings and strain localisation in 3D continua with microstructure . Part I Theo.pdf (908.72 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01728833 , version 1 (12-03-2018)

Identifiants

Citer

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, In press, ⟨10.1016/j.jmps.2018.03.004⟩. ⟨hal-01728833⟩
128 Consultations
257 Téléchargements

Altmetric

Partager

Gmail Facebook Twitter LinkedIn More