1. Thermo-Poro-Mechanical Properties of Clayey Gouge and Application to Rapid Fault Shearing
- Author
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Philippe Lazar, Jean Sulem, Ioannis Vardoulakis, Centre d'enseignement et de recherche en mécanique des sols (CERMES), Laboratoire Central des Ponts et Chaussées (LCPC)-École des Ponts ParisTech (ENPC), Faculty of Applied Mathematics and Physics, National Technical University of Athens [Athens] (NTUA), DGlab-Corinth (EVR1-CT-2000-40005), GDR-Corinth, DG-Lab Corinth, GDR-Corinth, 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), and Department of Applied Mathematics and Physics
- Subjects
fault ,[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] ,Effective stress ,[SDE.MCG]Environmental Sciences/Global Changes ,0211 other engineering and technologies ,Computational Mechanics ,FOS: Physical sciences ,[SDU.STU]Sciences of the Universe [physics]/Earth Sciences ,[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] ,Physics - Classical Physics ,02 engineering and technology ,Slip (materials science) ,010502 geochemistry & geophysics ,01 natural sciences ,Physics - Geophysics ,seismic slip ,Pore water pressure ,thermo-poro-mechanical couplings ,Fault gouge ,[PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph] ,General Materials Science ,Geotechnical engineering ,Fluidization ,[SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the solides [physics.class-ph] ,021101 geological & geomatics engineering ,0105 earth and related environmental sciences ,Shearing (physics) ,Seismic zone ,Classical Physics (physics.class-ph) ,Geotechnical Engineering and Engineering Geology ,Oedometer test ,Geophysics (physics.geo-ph) ,Mechanics of Materials ,clayey gouge ,Geology - Abstract
International audience; In this paper, the mechanism of fault pressurization in rapid slip events is analysed on the basis of a complete characterization of the thermo-poro-mechanical behaviour of a clayey gouge extracted at 760 m depth in Aigion fault in the active seismic zone of the Gulf of Corinth, Greece. It is shown that the thermally collapsible character of this clayey gouge can be responsible for a dramatic reduction of effective stress and a full fluidization of the material. The thickness of the ‘ultra-localized’ zone of highly strained material is a key parameter that controls the competing phenomena of pore pressure increase leading to fluidization of the fault gouge and temperature increase leading to pore-fluid vapourization.
- Published
- 2007