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Deformation, Permeability and Acoustic Emission Characteristics of Coal Masses under Mining-Induced Stress Paths

Author

Listed:
  • Yi Xue

    (State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, China)

  • Faning Dang

    (State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, China)

  • Zhengzheng Cao

    (School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Feng Du

    (School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Jie Ren

    (State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, China)

  • Xu Chang

    (School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Feng Gao

    (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

The geomechanical and seepage evolution characteristics of coal masses during mining are the key factors that affect the drainage of coalbed methane and the safety of coal mining. Nevertheless, the influence of mining paths on coal seam permeability is rarely investigated given the complexity of mining-induced stress experiments. To study the effect of mining-induced stress on coal mining, the mechanical properties, acoustic emission characteristics and energy evolution of coal masses were experimentally evaluated through mining-induced stress experiments. Experimental results indicated that at peak intensity, the deviatoric stress and axial strain of coal samples under the stress path of protective coal-seam mining are lower than those of coal samples under the non-pillar stress path. The unloading ratio of confining pressure is large under a stress path of non-pillar mining, and the elastic energy, the absorbed energy, and the dissipated energy of coal mass are low during destruction. The effect of high confining pressure on AE events is pronounced under the non-pillar mining path. The overall b value under high confining pressure is smaller than that under low confining pressure, and AE events generally have high energy. The fracture structure of coal mass is complex, and the fractal size of coal is large under high unloading rates of confining pressure, which induce the increase of permeability after coal destruction.

Suggested Citation

  • 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.
  • Handle: RePEc:gam:jeners:v:11:y:2018:i:9:p:2233-:d:165862
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    References listed on IDEAS

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    1. Yi Xue & Faning Dang & Zhengzheng Cao & Feng Du & Fei Liu & Jie Ren & Feng Gao, 2018. "Numerical Analysis of Heat and Gas Transfer Characteristics during Heat Injection Processes Based on a Thermo-Hydro-Mechanical Model," Energies, MDPI, vol. 11(7), pages 1-20, July.
    2. De Silva, G.P.D. & Ranjith, P.G. & Perera, M.S.A. & Chen, B., 2016. "Effect of bedding planes, their orientation and clay depositions on effective re-injection of produced brine into clay rich deep sandstone formations: Implications for deep earth energy extraction," Applied Energy, Elsevier, vol. 161(C), pages 24-40.
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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. Zetian Zhang & Ru Zhang & Zhiguo Cao & Mingzhong Gao & Yong Zhang & Jing Xie, 2020. "Mechanical Behavior and Permeability Evolution of Coal under Different Mining-Induced Stress Conditions and Gas Pressures," Energies, MDPI, vol. 13(11), pages 1-26, May.
    3. 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.
    4. Zhao, Pengxiang & Zhuo, Risheng & Li, Shugang & Lin, Haifei & Shu, Chi-Min & Shuang, Haiqing & Wei, Zongyong, 2023. "Greenhouse gas protection and control based upon the evolution of overburden fractures under coal mining: A review of methods, influencing factors, and techniques," Energy, Elsevier, vol. 284(C).

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