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dc.contributor.authorCheng, Zhu
dc.contributor.authorPouya, Ahmad
dc.contributor.authorArson, Chloé
dc.date.accessioned2015-08-28T18:11:16Z
dc.date.available2015-08-28T18:11:16Z
dc.date.issued2015
dc.identifier.citationC. Zhu, A. Pouya, C. Arson. "Micro-macro analysis and phenomenological modeling of salt viscous damage and application to salt caverns". Rock Mechanics and Rock Engineering. Sept 2015. DOI: http://dx.doi.org/10.1007/s00603-015-0832-9en_US
dc.identifier.urihttp://hdl.handle.net/1853/53776
dc.description.abstractThis paper aims to gain fundamental understanding of the microscopic mechanisms that control the transition between secondary and tertiary creep around salt caverns in typical geological storage conditions. We use a self-consistent inclusion-matrix model to homogenize the visco-plastic deformation of halite polycrystals and predict the number of broken grains in a Representative Elementary Volume of salt. We use this micro-macro modeling framework to simulate creep tests under various axial stresses, which gives us the critical visco-plastic strain at which grain breakage (i.e. tertiary creep) is expected to occur. The comparison of simulation results for short-term and long-term creep indicates that the initiation of tertiary creep depends on the stress and the viscoplastic strain. We use the critical viscoplastic deformation as a yield criterion to control the transition between secondary and tertiary creep in a phenomenological viscoplastic model, which we implement into the Finite Element Method program POROFIS. We model a 850m-deep salt cavern of irregular shape, in axis-symmetric conditions. Simulations of cavern depressurization indicate that a strain-dependent damage evolution law is more suitable than a stress-dependent damage evolution law, because it avoids high damage concentrations and allows capturing the formation of a damaged zone around the cavity. The modeling framework explained in this paper is expected to provide new insights to link grain breakage to phenomenological damage variables used in Continuum Damage Mechanics.en_US
dc.language.isoen_USen_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectSalt rocken_US
dc.subjectCreep deformationen_US
dc.subjectViscoplastic deformationen_US
dc.subjectFinite element methoden_US
dc.subjectGeological storageen_US
dc.titleMicro-macro analysis and phenomenological modeling of salt viscous damage and application to salt cavernsen_US
dc.typePre-printen_US
dc.contributor.corporatenameGeorgia Institute of Technology. School of Civil and Environmental Engineeringen_US
dc.identifier.doi10.1007/s00603-015-0832-9
dc.embargo.termsnullen_US


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