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HAN Ying, SHI Xiaohui, LEI Yun, SUN Liang, GUO Shan. Experimental Study on Increasing Coal Seam Permeability and Pre-drainage Gas by Liquid CO2 Phase-transforming Fracture[J]. Safety in Coal Mines, 2017, 48(10): 17-20.
Citation: HAN Ying, SHI Xiaohui, LEI Yun, SUN Liang, GUO Shan. Experimental Study on Increasing Coal Seam Permeability and Pre-drainage Gas by Liquid CO2 Phase-transforming Fracture[J]. Safety in Coal Mines, 2017, 48(10): 17-20.
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Experimental Study on Increasing Coal Seam Permeability and Pre-drainage Gas by Liquid CO2 Phase-transforming Fracture

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  • Published Date: October 19, 2017
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    • Abstract
  • In order to increase coal seam permeability, enhance the gas drainage efficiency, on the basis of the rock fracturing mechanism, mathematical model of crack extension by liquid CO2 blasting was established. Using COMSOL numerical software, transient model of liquid CO2 phase fracturing was established and by analyzing the laws of fractures development around drilling under the action of blasting air pressure; it is concluded that there are three zones of crushing zone, fissure zone and vibrating zone around the drillings. The basic theory, related equipment and construction technology were introduced and the industrial test experiment on liquid CO2 pre-splitting blasting was carried out in 152 belt conveyor diphead in Mabu Mine. The experiment result showed that: the average daily extraction concentration of single pore gas is 1.37 times the size of before blasting, the average daily extraction of single pore gas is 2.95 times the size of before blasting. The attenuation coefficient of gas flow decreased by 82.8%.
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