Chemo-Mechanical Damage and Healing of Granular Salt: Micro-macro modeling

Xianda, Shen; Zhu, Cheng; Arson, Chloé

Title:

Chemo-Mechanical Damage and Healing of Granular Salt: Micro-macro modeling

dc.contributor.author	Xianda, Shen
dc.contributor.author	Zhu, Cheng
dc.contributor.author	Arson, Chloé
dc.contributor.corporatename	Georgia Institute of Technology. School of Civil and Environmental Engineering	en_US
dc.date.accessioned	2016-07-07T14:52:53Z
dc.date.available	2016-07-07T14:52:53Z
dc.date.issued	2016-06
dc.description	Presented at the 50th US Rock Mechanics/Geomechanics Symposium of the American Rock Mechanics Association (ARMA), Houston, TX, 26-29 June 2016.	en_US
dc.description	Copyright © 2016 by the American Rock Mechanics Association
dc.description.abstract	A micro-macro chemo-mechanical model of damage and healing is proposed to predict the evolution of salt stiffness and deformation upon micro-crack propagation, opening, closure and rebonding, which is the result of pressure solution. We hypothesize that at a given grain contact, the surface area of the contact dictates which mechanism dominates the rate of healing. Based on thermodynamic equations of dissolution, diffusion and precipitation, we establish a formula for the critical contact area that marks the transition between diffusion-dominated kinetics and dissolution-precipitation-dominated kinetics. We relate the change of contact area to the change of solid volume in the Representative Elementary Volume, and we define net damage as the sum of the mechanical damage and the chemical porosity change. A continuum-based damage mechanics framework is used to deduce the change of salt stiffness with net damage. A stress path comprising a tensile loading, a compressive unloading, a creep– healing stage and a reloading is simulated. Stiffness degradation and residual strain development are observed with the evolution of damage under tensile loading. Unilateral effects of crack closure can be predicted by the model upon compression. Our micromacro model also allows predicting the evolution of the probability distribution of contact areas upon healing, as well as the consequent decrease of net damage and recovery of stiffness. The proposed modeling framework is expected to shed light on coupled healing processes that govern microstructure changes and subsequent variations of deformation rate, stiffness and permeability in salt rock, and to allow the assessment of long-term behavior of geological storage facilities in salt.	en_US
dc.embargo.terms	null	en_US
dc.identifier.citation	S. Xianda, C. Zhu, C. Arson. "Chemo-Mechanical Damage and Healing of Granular Salt: Micro-macro modeling". ARMA 16-177, Proc. 50th US Rock Mechanics/Geomechanics Symposium.	en_US
dc.identifier.uri	http://hdl.handle.net/1853/55354
dc.publisher	Georgia Institute of Technology	en_US
dc.subject	Chemo-mechanical damage model	en_US
dc.subject	Salt deformation	en_US
dc.subject	Damage mechanics framework	en_US
dc.subject	Salt rock	en_US
dc.title	Chemo-Mechanical Damage and Healing of Granular Salt: Micro-macro modeling	en_US
dc.type	Text
dc.type.genre	Post-print
dc.type.genre	Proceedings
dspace.entity.type	Publication
local.contributor.author	Arson, Chloé
local.contributor.author	Zhu, Cheng
local.contributor.corporatename	School of Civil and Environmental Engineering
local.contributor.corporatename	College of Engineering
relation.isAuthorOfPublication	ce5325f0-830f-4636-bc90-7527fd99005b
relation.isAuthorOfPublication	d28f1a84-f07d-40ec-bed3-60bc4c140551
relation.isOrgUnitOfPublication	88639fad-d3ae-4867-9e7a-7c9e6d2ecc7c
relation.isOrgUnitOfPublication	7c022d60-21d5-497c-b552-95e489a06569