Thermal and chemical effects in shear and compaction bands
| Autor: | Ioannis Stefanou, Jean Sulem |
|---|---|
| Přispěvatelé: | Laboratoire Navier (navier umr 8205), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
010504 meteorology & atmospheric sciences Compaction 010502 geochemistry & geophysics 01 natural sciences Instability Thermal Geotechnical engineering Computers in Earth Sciences Safety Risk Reliability and Quality 0105 earth and related environmental sciences Mechanics [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph] Geotechnical Engineering and Engineering Geology Microstructure Enginyeria civil::Geotècnia [Àrees temàtiques de la UPC] [SDE.ES]Environmental Sciences/Environmental and Society Shear bands Grain size [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering Wavelength Enginyeria geotècnica Shear (geology) Deformation bands Compactions bands |
| Zdroj: | Geomechanics for Energy and the Environment Geomechanics for Energy and the Environment, Elsevier, 2015, ⟨10.1016/j.gete.2015.12.004⟩ UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| ISSN: | 2352-3808 |
| DOI: | 10.1016/j.gete.2015.12.004 |
| Popis: | to appear; International audience; 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. |
| Databáze: | OpenAIRE |
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