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Failure Behavior and Damage Characteristics of Coal at Different Depths under Triaxial Unloading Based on Acoustic Emission

Author

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  • Anlin Zhang

    (College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
    State Key Laboratory of Hydraulics & Mountain River Engineering, Sichuan University, Chengdu 610065, China)

  • Ru Zhang

    (College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
    MOE Key Laboratory of Deep Earth Science & Engineering, Sichuan University, Chengdu 610065, China)

  • Mingzhong Gao

    (College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
    MOE Key Laboratory of Deep Earth Science & Engineering, Sichuan University, Chengdu 610065, China
    Institute of Deep Earth Science & Green Energy, Shenzhen University, Shenzhen 518060, China)

  • Zetian Zhang

    (College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
    State Key Laboratory of Hydraulics & Mountain River Engineering, Sichuan University, Chengdu 610065, China)

  • Zheqiang Jia

    (College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
    State Key Laboratory of Hydraulics & Mountain River Engineering, Sichuan University, Chengdu 610065, China)

  • Zhaopeng Zhang

    (MOE Key Laboratory of Deep Earth Science & Engineering, Sichuan University, Chengdu 610065, China)

  • Ersheng Zha

    (College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
    State Key Laboratory of Hydraulics & Mountain River Engineering, Sichuan University, Chengdu 610065, China)

Abstract

The depth effect of coal mechanical behavior seriously affects the safety and efficiency of deep coal mining. To explore the differences in failure behavior and damage characteristics of coal masses at different depths during the coal mining process, based on the consideration of in situ stress environment, physical properties, and mining disturbance of coal seams, triaxial unloading experiments with acoustic emission (AE) monitoring were conducted on coal samples at four different depths taken from the Pingdingshan coal mine area. The results showed that the AE activity of deep coal was more concentrated, and the cumulative AE energy of coal increased with increasing depth. The cumulative AE energy of the 1050-m coal sample was 69 times that of the 300-m coal sample. The b value representing the microcrack scale decreased with increasing depth, and the rupture degree of deep coal increased. The cracking mode of coal was classified and the failure behavior was analyzed. The cumulative tensile crack percentage of coal increased with increasing depth, and the tensile–shear composite failure occurred in the 300-m coal sample, whereas significant tensile failure occurred in the 1050-m coal sample. In addition, the damage evolution process of coal was divided into three stages, and the characteristic stress of coal was obtained. The ratio of crack initiation stress (σ ci ) to peak stress (σ c ) increased with increasing depth, and the damage evolution process of deep coal was more rapid. The research results can provide useful guidance for disaster prevention and evaluation of surrounding rock stability during deep coal resource mining in the Pingdingshan coal mine area.

Suggested Citation

  • 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.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:17:p:4451-:d:405289
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    References listed on IDEAS

    as
    1. Yi Xue & Faning Dang & Zhengzheng Cao & Feng Du & Jie Ren & Xu Chang & Feng Gao, 2018. "Deformation, Permeability and Acoustic Emission Characteristics of Coal Masses under Mining-Induced Stress Paths," Energies, MDPI, vol. 11(9), pages 1-18, August.
    2. Huiming Yang & Guangcai Wen & Qianting Hu & Yuanyuan Li & Linchao Dai, 2018. "Experimental Investigation on Influence Factors of Acoustic Emission Activity in Coal Failure Process," Energies, MDPI, vol. 11(6), pages 1-16, June.
    3. Chuangye Wang & Xinke Chang & Yilin Liu & Shijiang Chen, 2019. "Mechanistic Characteristics of Double Dominant Frequencies of Acoustic Emission Signals in the Entire Fracture Process of Fine Sandstone," Energies, MDPI, vol. 12(20), pages 1-17, October.
    4. Yang Tang & Seisuke Okubo & Jiang Xu & Shoujian Peng, 2018. "Study on the Progressive Failure Characteristics of Coal in Uniaxial and Triaxial Compression Conditions Using 3D-Digital Image Correlation," Energies, MDPI, vol. 11(5), pages 1-13, May.
    5. Pengfei Shan & Xingping Lai & Xiaoming Liu, 2019. "Correlational Analytical Characterization of Energy Dissipation-Liberation and Acoustic Emission during Coal and Rock Fracture Inducing by Underground Coal Excavation," Energies, MDPI, vol. 12(12), pages 1-15, June.
    6. 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.
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    Cited by:

    1. Feng Zhang & Jinshan Zhang, 2022. "Research on Joint Protection Layers and Gas Prevention Technology in Outburst Coal Seams," Sustainability, MDPI, vol. 14(14), pages 1-15, July.

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