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dc.contributor.authorZhu, Cheng
dc.contributor.authorArson, Chloé
dc.date.accessioned2014-06-23T12:14:46Z
dc.date.available2014-06-23T12:14:46Z
dc.date.issued2014-07
dc.identifier.citationC. Zhu, C. Arson, 2014. A model of damage and healing coupling halite thermo-mechanical behavior to microstructure evolution, Geotechnical and Geological Engineering, Special Issue: Thermohydro- mechanical behavior of soils and energy geostructures, DOI: 10.1007/s10706-014-9797-9 (in press)en_US
dc.identifier.urihttp://hdl.handle.net/1853/52023
dc.descriptionCopyright © 2014 Springer-Verlagen_US
dc.description.abstractCreep processes in halite (salt rock) include glide, cross-slip, diffusion and dynamic recrystallization. Diffusive Mass Transfer (DMT) can result in crack rebonding, and mechanical stiffness recovery. Crack rebonding driven by DMT occurs within a few days at room temperature and low pressure. DMT is enhanced at higher temperatures, which could be beneficial for the sustainabilty of geological storage facilities in salt mines. On the one hand, visco-plastic laws relating creep microscopic processes to microstructure changes are empirical. On the other hand, theoretical models of damage and healing disconnect thermodynamic variables from their physical meaning. The proposed model enriches the framework of Continuum Damage Mechanics (CDM) with fabric descriptors. In order to infer the form of fabric tensors from microstructure observation, creep tests were carried out on granular salt under constant stress and humidity conditions. The evolution of net damage is governed by a diffusion equation, in which the characteristic time scales with the typical size of halite crystals, and the diffusion coefficient is a function of temperature. A stress path comprising a tensile loading, a compressive unloading, a creep healing stage and a reloading was simulated. Macroscopic and microscopic model predictions highlight the increased efficiency of healing with time and temperature. The model presented in this paper is expected to improve the fundamental understanding of damage and healing in rocks at both macroscopic and microscopic levels, and the long-term assessment of geological storage facilities.en_US
dc.language.isoen_USen_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectContinuum damage mechanics (CDM)en_US
dc.subjectSalt rock formationsen_US
dc.subjectMicrostructuresen_US
dc.subjectCreep processesen_US
dc.subjectTemperature assisted diffusionen_US
dc.subjectCrack healingen_US
dc.subjectFabric tensoren_US
dc.subjectHaliteen_US
dc.titleA model of damage and healing coupling halite thermo-mechanical behavior to microstructure evolutionen_US
dc.typePost-printen_US
dc.contributor.corporatenameGeorgia Institute of Technology. School of Civil and Environmental Engineeringen_US
dc.identifier.doi10.1007/s10706-014-9797-9
dc.embargo.termsnullen_US


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