TY - GEN
T1 - Using microstructure descriptors to model thermo-mechanical damage and healing in Salt Rock
AU - Zhu, C.
AU - Arson, C.
N1 - Publisher Copyright: Copyright © 2014 ARMA, American Rock Mechanics Association.
PY - 2014
Y1 - 2014
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84927661978&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84927661978&partnerID=8YFLogxK
M3 - Conference contribution
T3 - 48th US Rock Mechanics / Geomechanics Symposium 2014
SP - 1324
EP - 1333
BT - 48th US Rock Mechanics / Geomechanics Symposium 2014
A2 - Petersen, Lee
A2 - Sterling, Ray
A2 - Detournay, Emmanuel
A2 - Pettitt, Will
A2 - Labuz, Joseph F.
PB - American Rock Mechanics Association (ARMA)
T2 - 48th US Rock Mechanics / Geomechanics Symposium 2014: Rock Mechanics Across Length and Time Scales
Y2 - 1 June 2014 through 4 June 2014
ER -