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Three-Dimensional Numerical Investigation of Coupled Flow-Stress-Damage Failure Process in Heterogeneous Poroelastic Rocks

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Listed:
  • Shikuo Chen

    (Department of Geological Engineering, Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610065, China)

  • Chenhui Wei

    (Centre for Rock Instability and Seismicity Research, School of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China)

  • Tianhong Yang

    (Centre for Rock Instability and Seismicity Research, School of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China)

  • Wancheng Zhu

    (Centre for Rock Instability and Seismicity Research, School of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China)

  • Honglei Liu

    (Centre for Rock Instability and Seismicity Research, School of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China)

  • Pathegama Gamage Ranjith

    (Deep Earth Energy Laboratory, Department of Civil Engineering, Monash University, Building 60, Melbourne 3800, Australia)

Abstract

The failure mechanism of heterogeneous rocks (geological materials), especially under hydraulic conditions, is important in geological engineering. The coupled mechanism of flow-stress-damage should be determined for the stability of rock mass engineering under triaxial stress states. Based on poroelasticity and damage theory, a three-dimensional coupled model of the flow-stress-damage failure process is studied, focusing mainly on the coupled characteristics of permeability evolution and damage in nonhomogeneous rocks. The influences of numerous mesoscale mechanical and hydraulic properties, including homogeneity, residual strength coefficient, loading rates, and strength criteria, on the macro mechanical response are analyzed. Results reveal that the stress sensitive factor and damage coefficient are key variables for controlling the progress of permeability evolution, and these can reflect the hydraulic properties under pre-peak and post-peak separately. Moreover, several experiments are conducted to evaluate the method in terms of permeability evolution and failure process and to verify the proposed two-stage permeability evolution model. This model can be used to illustrate the failure mechanics under hydraulic conditions and match different rock types. The relation of permeability with strain can also help confirm appropriate rock mass hydraulic parameters, thereby enhancing our understanding of the coupled failure mechanism in rock mass engineering.

Suggested Citation

  • Shikuo Chen & Chenhui Wei & Tianhong Yang & Wancheng Zhu & Honglei Liu & Pathegama Gamage Ranjith, 2018. "Three-Dimensional Numerical Investigation of Coupled Flow-Stress-Damage Failure Process in Heterogeneous Poroelastic Rocks," Energies, MDPI, vol. 11(8), pages 1-16, July.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:8:p:1923-:d:159618
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    References listed on IDEAS

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    1. Antony Young, 2014. "1 + 1 = 3," Palgrave Macmillan Books, in: Brand Media Strategy, edition 0, chapter 0, pages 81-99, Palgrave Macmillan.
    2. Yu Wang & Xiao Li & Ruilin Hu & Chaofeng Ma & Zhiheng Zhao & Bo Zhang, 2016. "Numerical Evaluation and Optimization of Multiple Hydraulically Fractured Parameters Using a Flow-Stress-Damage Coupled Approach," Energies, MDPI, vol. 9(5), pages 1-19, April.
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