Using microstructure descriptors to model thermo-mechanical damage and healing in Salt Rock

Cheng Zhu, C. Arson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Creep processes in halite (salt rock) include glide, cross-slip. difthsion and dynamic recrystallization. Diffusive Mass Transfer (DM1) can result in crack rehonding. and mechanical stiffness recovery. On the one hand, viscoplastic laws relating creep microscopic processes to microstructure changes are empirical. On the other hand, theoretical models of damage and healing disconnect thennodynamic variables from their physical meaning. The proposed model enriches the framework of Continuum Damage Mechanics (CDM) with fabric descriptors. In order to infer the Ibrin of fabric tensors from inicrostructure observation, creep tests were carried out on granular salt under constant stress and humidity conditions. 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 inetcascd efficiency of healing with time. A preliminaty Finite Element model illustrates the impact of healing on the stress distribution in the Excavation l)atnagc Zone (EDZ) 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.

Original languageEnglish (US)
Title of host publication48th US Rock Mechanics / Geomechanics Symposium 2014
EditorsLee Petersen, Ray Sterling, Emmanuel Detournay, Will Pettitt, Joseph F. Labuz
PublisherAmerican Rock Mechanics Association (ARMA)
Pages1324-1333
Number of pages10
ISBN (Electronic)9781634395236
StatePublished - Jan 1 2014
Event48th US Rock Mechanics / Geomechanics Symposium 2014: Rock Mechanics Across Length and Time Scales - Minneapolis, United States
Duration: Jun 1 2014Jun 4 2014

Publication series

Name48th US Rock Mechanics / Geomechanics Symposium 2014
Volume2

Conference

Conference48th US Rock Mechanics / Geomechanics Symposium 2014: Rock Mechanics Across Length and Time Scales
CountryUnited States
CityMinneapolis
Period6/1/146/4/14

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology

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  • Cite this

    Zhu, C., & Arson, C. (2014). Using microstructure descriptors to model thermo-mechanical damage and healing in Salt Rock. In L. Petersen, R. Sterling, E. Detournay, W. Pettitt, & J. F. Labuz (Eds.), 48th US Rock Mechanics / Geomechanics Symposium 2014 (pp. 1324-1333). (48th US Rock Mechanics / Geomechanics Symposium 2014; Vol. 2). American Rock Mechanics Association (ARMA).