Theoretical bases of thermomechanical damage and DMT-healing model for rock

C. Zhu, C. Arson

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

1 Scopus citations

Abstract

A theoretical framework is proposed to model thermomechanical (TM) crack opening, closure, and healing in rock. The model is based on continuum damage mechanics and thermodynamics. The postulated free energy is a polynomial of deformation, temperature, damage, and healing. The damage-driving force captures damage evolution due to mechanical or TM tensile stresses and the decrease of material toughness at elevated temperature. Crack closure is modeled by adopting the concept of unilateral effect on rock stiffness. A mixed variable is introduced to account for anisotropic TM damage and rate-dependent healing. Crack rebonding is assumed to result from diffusive mass transfer (DMT) processes, and, accordingly, the healing evolution law is governed by the diffusion equation. Contrary to other models for rock, the healing deformation is not a creep volumetric deformation, but the difference between the deformation before and after DMT. A parametric study illustrates the model capabilities: the simulation of TM stress paths with higher degree of mechanical recovery for longer healing time or higher healing temperature. The proposed model is expected to better predict the long-term behavior of self-healing rock materials-containing clay of halite minerals for instance.

Original languageEnglish (US)
Title of host publicationGeo-Congress 2014 Technical Papers
Subtitle of host publicationGeo-Characterization and Modeling for Sustainability - Proceedings of the 2014 Congress
PublisherAmerican Society of Civil Engineers (ASCE)
Pages2785-2794
Number of pages10
Edition234 GSP
ISBN (Print)9780784413272
DOIs
StatePublished - 2014
Event2014 Congress on Geo-Characterization and Modeling for Sustainability, Geo-Congress 2014 - Atlanta, GA, United States
Duration: Feb 23 2014Feb 26 2014

Publication series

NameGeotechnical Special Publication
Number234 GSP
ISSN (Print)0895-0563

Other

Other2014 Congress on Geo-Characterization and Modeling for Sustainability, Geo-Congress 2014
CountryUnited States
CityAtlanta, GA
Period2/23/142/26/14

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

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