Feasibility of deep-hole blasting technology for outburst prevention and permeability enhancement in high-gas-content coal seams with low-permeability subjected to high geo-stresses

Zhao Bao-you; Wang Hai-dong

doi:10.11883/1001-1455(2014)02-0145-08

Volume 34 Issue 2

May 2014

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Zhao Bao-you, Wang Hai-dong. Feasibility of deep-hole blasting technology for outburst prevention and permeability enhancement in high-gas-content coal seams with low-permeability subjected to high geo-stresses[J]. Explosion And Shock Waves, 2014, 34(2): 145-152. doi: 10.11883/1001-1455(2014)02-0145-08

Citation:

Zhao Bao-you, Wang Hai-dong. Feasibility of deep-hole blasting technology for outburst prevention and permeability enhancement in high-gas-content coal seams with low-permeability subjected to high geo-stresses[J]. Explosion And Shock Waves, 2014, 34(2): 145-152. doi: 10.11883/1001-1455(2014)02-0145-08

Citation:

Zhao Bao-you, Wang Hai-dong. Feasibility of deep-hole blasting technology for outburst prevention and permeability enhancement in high-gas-content coal seams with low-permeability subjected to high geo-stresses[J]. Explosion And Shock Waves, 2014, 34(2): 145-152. doi: 10.11883/1001-1455(2014)02-0145-08

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Feasibility of deep-hole blasting technology for outburst prevention and permeability enhancement in high-gas-content coal seams with low-permeability subjected to high geo-stresses

doi: 10.11883/1001-1455(2014)02-0145-08

Zhao Bao-you^{1
,
,},
Wang Hai-dong²

1.
College of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China
2.
State Key Laboratory of Coal Mine Safety Technology, Shenyang Research Institute, China Coal Technology & Engineering Group Corp, Shenyang110016, Liaoning, China

Funds: Supported by the National Natural Science Foundation of China (51304109, 51204086)

More Information

Corresponding author: Zhao Bao-you, rocksoul@163.com
Received Date: 2012-09-03
Rev Recd Date: 2013-01-06
Publish Date: 2014-03-25

Abstract

Abstract

By considering the action of blasting wave, explosion-induced gas and initial gas pressure as well as geo-stress endured by coal seam simultaneously, the deep-hole blasting in low-permeability high-gas-content coal seams under different geo-stresses were numerically simulated by using the FLAC3Dcode.And the simulated results were compared with the laboratory model test and other related field studies on the permeability improvement of the low-permeability coal seams.The comparable analysis indicates that the geo-stress can dramatically inhibit the extension of the blast-induced cracks in the coal seams, especially for the deeply-buried coal seams.Though the radius of the blasting crack zones linearly decreases with the increasing of geo-stress, the blasting technique can also be adapted to enhance the permeability of the deeply-buried low-permeability coal seams.And the direction of the maximum geo-stress can affect the extension direction of the blast-induced cracks in some degree.Therefore, in a practical blasting engineering, the spatial location of the blast holes should be determined according to the state of the geo-stress endured by the coal seam.

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References

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