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Volume 43 Issue 7
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LIU Wu, GUO Shen-lei, LU Qian, ZHENG Lian-ge, YUAN Wen-jun. Numerical model for hydro-mechanical-damage coupling of rocks based on TOUGHREACT[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(7): 1306-1314. DOI: 10.11779/CJGE202107016
Citation: LIU Wu, GUO Shen-lei, LU Qian, ZHENG Lian-ge, YUAN Wen-jun. Numerical model for hydro-mechanical-damage coupling of rocks based on TOUGHREACT[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(7): 1306-1314. DOI: 10.11779/CJGE202107016
shu

Numerical model for hydro-mechanical-damage coupling of rocks based on TOUGHREACT

  • 1.

    School of Civil Engineering, Hefei University of Technology, Hefei 230009, China

  • 2.

    Key Laboratory of Geological Hazards on Three Gorges Reservoir Area (China Three Gorges University), Ministry of Education, Yichang 443002, China

  • 3.

    Lawrence Berkeley National Laboratory, Berkeley 94701, America

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  • Received Date: August 19, 2020
  • Available Online: December 02, 2022
    Graphical Abstract
    • Abstract
  • For better modelling the microscopic characteristics and evolution of materials under hydro-mechanical coupling conditions, a TOUGHREACT-based hydro-mechanical-damage coupled numerical model for saturated rocks is established by using the microscopic homogenization method and the thermodynamics theory. The proposed model well accounts for the influences of sliding dilatancy, damage propagation and normal compression of arbitrary microcracks on the macroscopic deformation and failure characteristics, permeability evolution and fluid flow process. The numerical method is successfully validated through the experimental data of water injection tests on coal sample at the laboratory scale and then used to carry out application simulations of water injection responses at the field scale. The numerical simulation results demonstrate that the distributions of injection-induced rock damage and elevated pressure are affected by the injection rate, in-situ stresses and anisotropic distribution of the initial microcracks, and they are more developed in the directions with larger in-situ stress and dominant development of microcracks. Better simulations of the macroscopic hydro-mechanical responses of rocks depend on the accurate characterization of the internal microscopic structures. The research may provide a useful reference for deepening the study on hydro-mechanical coupling of rocks.
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    • References (24)
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