Title:
Microstructure-based modeling of damage and healing in salt rock with application to geological storage

dc.contributor.advisor Arson, Chloé
dc.contributor.author Zhu, Cheng
dc.contributor.committeeMember Frost, David
dc.contributor.committeeMember Dai, Sheng
dc.contributor.committeeMember Huber, Christian
dc.contributor.committeeMember Pouya, Ahmad
dc.contributor.department Civil and Environmental Engineering
dc.date.accessioned 2016-08-22T12:22:59Z
dc.date.available 2016-08-22T12:22:59Z
dc.date.created 2016-08
dc.date.issued 2016-06-24
dc.date.submitted August 2016
dc.date.updated 2016-08-22T12:22:59Z
dc.description.abstract Most mineral and energy resources such as ore, petroleum, natural gas, and geothermal energy are recovered from the earth. Nuclear waste repositories and CO2 storage systems are buried underground. Recovery of mineral resources, storage of energy, and disposal of waste involve changes in coupled mechanical and transport rock properties. The evolution of pores and cracks during thermo-hydro-chemo-mechanical coupled processes governs the variations of macroscopic properties. This research investigates the modeling of damage and healing in rocks with applications in geological storage. This presentation focuses on salt rock, which is used as a model material to study rock microstructure evolution under various stress paths, and to understand the microscopic processes that lead to macroscopic mechanical recovery. We developed two different techniques based on continuum damage mechanics (CDM) and micromechanics. The first method enriches the framework of CDM with fabric descriptors. We carried out creep tests on granular salt to infer the form of fabric tensors from microstructure observation. Net damage evolution is governed by a diffusion equation. Macroscopic and microscopic model predictions highlight the increased efficiency of healing with time and temperature. The other method is based on a self-consistent homogenization scheme, in which the viscoplastic and damage behavior of halite polycrystals is upscaled from mono-crystal slip mechanisms. The model provides micro-mechanical interpretations to important aspects of salt rock viscoplastic and fatigue behavior. We implemented the micromechanical model in a finite element program to characterize crack patterns in salt polycrystals and predict damage around a salt cavern used for high-pressure gas storage. This study is expected to improve the fundamental understanding of damage and healing in rocks, and the long-term assessment of geological storage facilities.
dc.description.degree Ph.D.
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/55608
dc.language.iso en_US
dc.publisher Georgia Institute of Technology
dc.subject Salt
dc.subject Continuum damage mechanics
dc.subject Healing
dc.subject Fabric tensor
dc.subject Micromechanics
dc.subject Viscoplastic deformation
dc.subject Creep
dc.subject Fatigue
dc.subject Finite element method
dc.subject Geological storage
dc.title Microstructure-based modeling of damage and healing in salt rock with application to geological storage
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.advisor Arson, Chloé
local.contributor.author Zhu, Cheng
local.contributor.corporatename School of Civil and Environmental Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication 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
thesis.degree.level Doctoral
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