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Volume 36 Issue 3
May. 2022
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Chinese Journal of High Pressure Physics  > 2022  >  36(3): 035301.
LI Zhenzhen, YU Jianxin, YANG Xiaolin, CHU Huaibao, WANG Jinxing, LIU Huanchun. Crack Propagation Regularity of Hydraulic Blasting in Deep Coal Seam[J]. Chinese Journal of High Pressure Physics, 2022, 36(3): 035301. doi: 10.11858/gywlxb.20210912
Citation: LI Zhenzhen, YU Jianxin, YANG Xiaolin, CHU Huaibao, WANG Jinxing, LIU Huanchun. Crack Propagation Regularity of Hydraulic Blasting in Deep Coal Seam[J]. Chinese Journal of High Pressure Physics, 2022, 36(3): 035301. doi: 10.11858/gywlxb.20210912
shu

Crack Propagation Regularity of Hydraulic Blasting in Deep Coal Seam

doi: 10.11858/gywlxb.20210912
  • 1.

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

  • 2.

    College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China

  • Received Date: 01 Dec 2021
  • Rev Recd Date: 21 Dec 2021
  • Issue Publish Date: 30 May 2022
    Abstract
  • Deep coal seam has high geostress, high gas content and low permeability coefficient, which seriously threaten the safety and efficiency of coal production, so it is necessary to strengthen the permeability enhancement and improve the gas extraction rate. Hydraulic blasting has the characteristics of high energy transfer efficiency and good safety, and can be better applied to the permeability enhancement of deep coal seam. In order to study the crack propagation regularity of hydraulic blasting in deep coal seam, LS-DYNA numerical method was used to analyze the effect of fracture of coal seam under different geostresses, uncoupling coefficient and coupling medium. The results show that the geostress can reduce the impact load caused by hydraulic blasting. With the increase of geostress, the crack length of coal seam becomes shorter and the range of crack zone decreases. When the geostress is within the range of 1−20 MPa, the attenuation trend of blasting stress wave weakens gradually with the increase of geostress. With the increase of the uncoupling coefficient, the range of crushing zone decreases, the range of fracture zone increases at first and then decreases. When the uncoupling coefficient is in the range of 1.0−3.0 and the uncoupling coefficient is 2.0, the blasting cracking effect is the best. When blasting in different coupling media, and the range of blasting fracture zone in water is larger than that in air. The maximum effective stress produced by blasting in water is 1.35 times higher than that in air, the water is more beneficial to the propagation and development of coal seam cracks. This research results have a certain guiding role for the engineering practice of crack propagation and permeability enhancement caused by hydraulic blasting in deep coal seam.

     

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