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ZHANG Chunhua, ZHANG Zijian, NIAN Jun, JIAO Dengming. Mechanism and effect analysis of enhanced gas drainage with large diameter double boreholes[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(6): 273-280. DOI: 10.3969/j.issn.1001-1986.2021.06.033
Citation: ZHANG Chunhua, ZHANG Zijian, NIAN Jun, JIAO Dengming. Mechanism and effect analysis of enhanced gas drainage with large diameter double boreholes[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(6): 273-280. DOI: 10.3969/j.issn.1001-1986.2021.06.033
shu

Mechanism and effect analysis of enhanced gas drainage with large diameter double boreholes

  • 1.

    College of Safety Science and Engineering, Liaoning Technical University, Fuxin 123000, China

  • 2.

    College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030000, China

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  • Received Date: September 27, 2021
  • Revised Date: November 03, 2021
  • Available Online: December 29, 2021
  • Published Date: December 24, 2021
    Graphical Abstract
    • Abstract
  • To study the mechanism of enhanced gas drainage with large diameter double boreholes, numerical models of single holes with different diameters and double ø350 mm holes were established by using the RFPA2D-Gas software in working face 30110 of Shiquan Coal Mine, Shanxi Province. Stress distribution, damage and fracture, gas permeability evolution and gas migration law of the coal around the hole were analyzed, and then the extraction effect of double ø350 mm holes was investigated. Simulation results show that the pressure relief radii of the ø100 mm, ø250 mm, ø350 mm and double ø350 mm holes are 0.25 m, 0.9 m, 1.2 m and 2.2 m, respectively. The coal damage extends to the upper left and upper right around the holes of ø250 mm, ø350 mm and double ø350 mm, and the final fracture shape is like spreading wings of a butterfly. The permeability coefficient of the coal at 1.5 m above the double ø350 mm holes can increase from 0.25 m2/(MPa2·d) to 240 m2/(MPa2·d). The gas migration rate increases with the increase of hole diameter, and gradually decreases in the drainage. However, when the coal around the hole is damaged, it will increase to a certain extent. The field investigation results show that the gas extraction effect is enhanced by the collapse of double ø350 mm holes. For the double ø350 mm hole, the drainage radius is 2 m, the gas flow can be 21 times that of the ø100 mm hole, and the total volume of extraction is more than 10 times and even 40 times of the ø100 mm hole.
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