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Damage Evolution and Failure Behavior of Post-Mainshock Damaged Rocks under Aftershock Effects

Author

Listed:
  • Zilong Zhou

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China
    College of Civil Engineering and Architecture, Hainan University, Haikou 570228, China)

  • Haiquan Wang

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Xin Cai

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Lu Chen

    (School of Civil Engineering, Changsha University of Science & Technology, Changsha 410076, China)

  • Yude E

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Ruishan Cheng

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

Abstract

Rock stability has long been a hot topic during underground energy exploitation, but the failure process of rock materials under earthquake effects is extremely complicated, and the failure mechanism still remains unclear. In order to investigate the fatigue damage and failure behavior of rocks under aftershock effects considering the post-mainshock damage states, a series of laboratory tests were conducted on marble specimens subjected to stepwise cyclic loading. Four levels of peak stress (i.e., 10, 30, 50, and 70 MPa) were applied in the first cycle, to simulate mainshock damage. The results indicate that, with the increase of initial cycle amplitude, mainshock damage has a significant effect on deformation behavior, dissipated energy, P-wave velocity, and AE characteristics of tested specimens during aftershock process. The increasing amplitude of initial cycle enhances irreversible deformation and weakens the resistance to deformation, which accelerates the expansion of specimen volume and results in the reduction of bearing capacity. Furthermore, the increasing amplitude of initial cycle obviously changes the failure morphologies and intensifies the final macro-fracture scale of tested specimens, which are verified by acoustic emission AF-RA value and b -value, respectively.

Suggested Citation

  • Zilong Zhou & Haiquan Wang & Xin Cai & Lu Chen & Yude E & Ruishan Cheng, 2019. "Damage Evolution and Failure Behavior of Post-Mainshock Damaged Rocks under Aftershock Effects," Energies, MDPI, vol. 12(23), pages 1-17, November.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:23:p:4429-:d:289487
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    Citations

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    Cited by:

    1. Ersheng Zha & Ru Zhang & Zetian Zhang & Ting Ai & Li Ren & Zhaopeng Zhang & Yang Liu & Chendi Lou, 2020. "Acoustic Emission Characteristics and Damage Evolution of Rock under Different Loading Modes," Energies, MDPI, vol. 13(14), pages 1-17, July.
    2. Anlin Zhang & Ru Zhang & Mingzhong Gao & Zetian Zhang & Zheqiang Jia & Zhaopeng Zhang & Ersheng Zha, 2020. "Failure Behavior and Damage Characteristics of Coal at Different Depths under Triaxial Unloading Based on Acoustic Emission," Energies, MDPI, vol. 13(17), pages 1-21, August.
    3. Yuan Zhao & Guoyan Zhao & Jing Zhou & Dianfei Pei & Weizhang Liang & Ju Qiu, 2020. "What Hinders the Promotion of the Green Mining Mode in China? A Game-Theoretical Analysis of Local Government and Metal Mining Companies," Sustainability, MDPI, vol. 12(7), pages 1-17, April.

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