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Study on the Optimization of a Gas Drainage Borehole Drainage Horizon Based on the Evolution Characteristics of Mining Fracture

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Listed:
  • Tengteng Li

    (School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China)

  • Bing Wu

    (School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China)

  • Baiwei Lei

    (School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China)

Abstract

Gas disaster restricts the safety development of coal mine. The technology of high-level borehole gas drainage is an important means to reduce the gas concentration in goaf. In order to determine the best position of the end of gas drainage hole, in this paper, based on the geological conditions of Xinyuan coal mine 31009 working face, a series of numerical simulation is carried out; and through the field test, the dynamic change of gas concentration in different height of borehole is monitored. The results show that: When the working face advances to different distances, there are four characteristic distribution areas in the horizontal direction: the fracture area of the original rock stratum, fracture channel generation and development area, fracture channel mature area and fracture channel closure area. Although the drilling horizon is different, the change of gas concentration in drilling can be divided into four stages: gas stabilization stage, gas initial change stage, gas fluctuation stage and gas re-stabilization stage. The variation of borehole concentration can reflect the evolution characteristics of fracture area. The response time of gas change in different layers is also different. In the gas initial change stage and the gas re-stabilization stage, the low-level borehole first responds. The response of gas change in high-level drilling is a long process, so the effect of high-level drilling is better than that of low-level drilling. For 31009 working face, the best gas drainage layer is 32m, and the field gas drainage has achieved good practical results. This study can provide some guidance for the prevention and control of gas disaster in goaf.

Suggested Citation

  • Tengteng Li & Bing Wu & Baiwei Lei, 2019. "Study on the Optimization of a Gas Drainage Borehole Drainage Horizon Based on the Evolution Characteristics of Mining Fracture," Energies, MDPI, vol. 12(23), pages 1-15, November.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:23:p:4499-:d:291036
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    References listed on IDEAS

    as
    1. Liang Cheng & Zhaolong Ge & Jiufu Chen & Hao Ding & Lishuang Zou & Ke Li, 2018. "A Sequential Approach for Integrated Coal and Gas Mining of Closely-Spaced Outburst Coal Seams: Results from a Case Study Including Mine Safety Improvements and Greenhouse Gas Reductions," Energies, MDPI, vol. 11(11), pages 1-16, November.
    2. Zhicheng Xie & Dongming Zhang & Zhenlong Song & Minghui Li & Chao Liu & Dongling Sun, 2017. "Optimization of Drilling Layouts Based on Controlled Presplitting Blasting through Strata for Gas Drainage in Coal Roadway Strips," Energies, MDPI, vol. 10(8), pages 1-13, August.
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