Thermal and chemical effects in shear and compaction bands

Abstract : Strain localization zones in the form of shear bands or compaction bands in geomaterials are observed across scales from sub-millimetric (grain size) to kilometric scale (geological structures). Triggering and evolution of such narrow zones of localized deformation depends on many factors. The mechanical behavior of geomaterials is central for the formation of such zones. However, thermal, pore-pressure and chemical effects play a crucial role in shear and compaction banding. Temperature increase and activation of chemical reactions such as mineral dehydration, carbonate decomposition, as well as dissolution/precipitation control the triggering and the evolution of localized deformation zones. Moreover, the inherent heterogeneous microstructure of geomaterials plays a significant role during strain localization. The purpose of this paper is to provide a review of recent research regarding the effects of temperature, pore-pressure, chemical reactions and microstructure on strain localization in geomaterials. Examples have been taken in relation with seismic slip and with compaction banding. Strain localization is treated as an instability from a homogeneous deformation state. Different types of instabilities may (co-) exist depending on different multi-physical couplings and micro-mechanisms. Finally, a comparison of rate dependent Cauchy continuum and rate independent generalized continua (Cosserat continuum) is made, which leads to an analog expression for the critical perturbation wave length, which scales the thickness of the localized zone and defines the region that non-homogeneous deformations are possible.
Liste complète des métadonnées

Littérature citée [70 références]  Voir  Masquer  Télécharger

https://hal-enpc.archives-ouvertes.fr/hal-01241131
Contributeur : Ioannis Stefanou <>
Soumis le : vendredi 15 janvier 2016 - 16:02:00
Dernière modification le : jeudi 11 janvier 2018 - 06:25:23
Document(s) archivé(s) le : samedi 16 avril 2016 - 10:52:38

Fichier

Final paper.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

Citation

Jean Sulem, Ioannis Stefanou. Thermal and chemical effects in shear and compaction bands. Geomechanics for Energy and the Environment, 2015, 〈10.1016/j.gete.2015.12.004〉. 〈hal-01241131〉

Partager

Métriques

Consultations de la notice

233

Téléchargements de fichiers

173