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Prevention and control of abnormal gas emission caused by accidental discharge of floor fissure water: a case study

Author

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  • Zi-shan Gao

    (China University of Mining and Technology)

  • Chuan-jie Zhu

    (China University of Mining and Technology)

  • Xi-miao Lu

    (China University of Mining and Technology)

  • Jie Ren

    (China University of Mining and Technology)

Abstract

Gas (coalbed methane) and fissure water often coexist in coal-bearing strata, and gas is sealed in adjacent rock strata by fissure water in some coal mines. After the fissure water is discharged, abnormal gas emission may occur due to accidental release of large amount of sealed gas. In the present work, abnormal gas emission caused by accidental discharge of floor fissure water occurred at Tangjiahe Coal Mine (Guangyuan, China), and its control method was discussed. Sealing technology, uniform pressure ventilation and gas drainage for intercepting gas by cross-boreholes were adopted to solve abnormal gas emission. Firstly, several sealings were constructed to seal gobs full of high-concentration gas, which prevented gas diffusion and spread into mining space. Two gas extraction systems were installed, and uniform pressure ventilation was applied to eliminate fissure gas accumulated in gobs. Subsequently, a comprehensive recovery of ventilation was realized. As a supplementary measure, downward cross-boreholes were drilled to prevent gas from releasing into mining space.

Suggested Citation

  • Zi-shan Gao & Chuan-jie Zhu & Xi-miao Lu & Jie Ren, 2020. "Prevention and control of abnormal gas emission caused by accidental discharge of floor fissure water: a case study," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 100(2), pages 713-733, January.
    • Handle: RePEc:spr:nathaz:v:100:y:2020:i:2:d:10.1007_s11069-019-03835-6
    DOI: 10.1007/s11069-019-03835-6
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    References listed on IDEAS

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    1. Guang Xu & Jinxin Huang & Baisheng Nie & Duncan Chalmers & Zhuoming Yang, 2017. "Calibration of Mine Ventilation Network Models Using the Non-Linear Optimization Algorithm," Energies, MDPI, vol. 11(1), pages 1-9, December.
    2. Fangtian Wang & Cun Zhang & Ningning Liang, 2017. "Gas Permeability Evolution Mechanism and Comprehensive Gas Drainage Technology for Thin Coal Seam Mining," Energies, MDPI, vol. 10(9), pages 1-18, September.
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    4. Shouqing Lu & Yuanping Cheng & Jinmin Ma & Yuebing Zhang, 2014. "Application of in-seam directional drilling technology for gas drainage with benefits to gas outburst control and greenhouse gas reductions in Daning coal mine, China," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 73(3), pages 1419-1437, September.
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