›› 2013, Vol. 34 ›› Issue (9): 2496-2500.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Increasing permeability mechanism using directional cumulative blasting in coal seams with high concentration of gas and low permeability

MU Chao-min1, 2，WANG Hai-lu1, 2，HUANG Wen-yao3，KUANG Chang-jian1   

  1. 1. School of Energy Resources and Safety, Anhui University of Science and Technology, Huainan, Anhui 23001, China; 2. Key Lab. of Mining Coal Safety and Efficiently Constructed by Anhui Province and Ministry of Education, Anhui University of Science and Technology, Huainan, Anhui 232001, China; 3. School of Chemical Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, China
  • Received:2013-04-26 Online:2013-09-11 Published:2013-09-13

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Abstract: In order to solve the problems of blasting to increase permeability in the coal seam, the methods of directional explosion with shaped charge are investigated. Jet of shaped charge penetrates the coal forming initial cracks and subsequently cracks are expanded by the wedge of explosive gas. The mechanisms of cracks of different directions are researched using numerical simulation and model tests. Through experiments on the work face of coal, it is proved that directional explosion with shaped achieve the aims of protecting roof and increasing cracks in demanding direction. The experiment results show that the change of gas drainage volume is most obvious in 3 hours after blasting; and maximum gas drainage volume is 470 times the original volume. The effective radius of gas drainage is within 7 meters; meanwhile the roof vibration amplitude is about 0.23 centimeters.

Key words: gas disasters, explosion mechanics, increasing permeability, cumulative blasting

CLC Number: 

  • TD 313
[1] LI Qing , ZHANG Xi , LI Sheng-yuan , XIE Jian-wen , MENG Ning-ning. Experimental study of dynamic fracture behaviors of branched cracks under blasting stress wave [J]. , 2011, 32(10): 3026-3032.
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