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Pressure Relief Mechanism and Gas Extraction Method during the Mining of the Steep and Extra-Thick Coal Seam: A Case Study in the Yaojie No. 3 Coal Mine

Author

Listed:
  • Hao Zhang

    (College of Safety & Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Lehua Xu

    (Key Laboratory of In-Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China)

  • Mengmeng Yang

    (College of Safety & Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Cunbao Deng

    (College of Safety & Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Yuanping Cheng

    (Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou 221116, China
    National Engineering Research Center for Coal and Gas Control, China University of Mining and Technology, Xuzhou 221116, China
    School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

Gas disasters, such as coal and gas outburst and gas overflow, always occur during the mining of the steep and extra-thick coal seam in the horizontal, fully mechanized, top coal slice caving (HFMTCSC) method. To solve these issues and guarantee the safe and efficient mining in the Yaojie No. 3 coal mine, 3DEC software was used in this work to investigate the overburden movement and collapse law as well as the stress redistribution and coal-seam deformation characteristics below the goaf. The results show that a pressure arch structure and a hinge structure are formed in succession in the overburden rock, which induces stress redistribution in the coal below the goaf. During the mining of the upper slice, more than 75% of the coal in the lower slice is located at the effective pressure relief zone; therefore, the steep and extra-thick coal seam can then be protected slice by slice. Meanwhile, with the increase of mining depth, the efficient pressure relief range expands. Based on this pressure relief mechanism, crossing boreholes and bedding boreholes were reasonably designed to efficiently extract the pressure relief gas during the mining of the steep and extra-thick coal seam in the Yaojie No. 3 coal mine.

Suggested Citation

  • Hao Zhang & Lehua Xu & Mengmeng Yang & Cunbao Deng & Yuanping Cheng, 2022. "Pressure Relief Mechanism and Gas Extraction Method during the Mining of the Steep and Extra-Thick Coal Seam: A Case Study in the Yaojie No. 3 Coal Mine," Energies, MDPI, vol. 15(10), pages 1-17, May.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:10:p:3792-:d:820710
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    References listed on IDEAS

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    1. Jinrong Cao & Linming Dou & Guangan Zhu & Jiang He & Shengchuan Wang & Kunyou Zhou, 2020. "Mechanisms of Rock Burst in Horizontal Section Mining of a Steeply Inclined Extra-Thick Coal Seam and Prevention Technology," Energies, MDPI, vol. 13(22), pages 1-20, November.
    2. Kong, Shengli & Cheng, Yuanping & Ren, Ting & Liu, Hongyong, 2014. "A sequential approach to control gas for the extraction of multi-gassy coal seams from traditional gas well drainage to mining-induced stress relief," Applied Energy, Elsevier, vol. 131(C), pages 67-78.
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    Cited by:

    1. Shengquan He & Shengnan Ou & Fengxiang Huang & Longzhe Jin & Yanran Ma & Tuo Chen, 2022. "Borehole Protection Technology of Screen Pipes for Gas Drainage Boreholes in Soft Coal Seams," Energies, MDPI, vol. 15(15), pages 1-12, August.

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