液态CO2爆破煤层增透最优钻孔参数研究

doi:10.13722/j.cnki.jrme.2015.0319

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Abstract The selection of blasting borehole parameters is a key to eliminate the blasting blank area and to improve effects of blasting antireflection and gas extraction. In the process of liquid CO2 blasting，the curve of pressure-time process in the main pipe blasting was monitored. The principle of liquid CO2 blasting was studied and a FLAC3D numerical model was established. The results showed that the effective radius of single hole blasting was 6 m and 4 m along and normal to the direction of the vent hole in the horizontal bedding respectively. The control hole increased obviously the range of fracturing area under multi hole continuous blasting. Mathematical calculations and numerical simulation were adapted to identify optimal borehole parameters of multi hole continuous blasting. The spacing of blasting device and the blast hole spacing were determined as 5 m and 7.5 m respectively. The results of experiment on liquid CO2 blasting underground indicated that the permeability of coal seam increased by 17.49–22.76 times，and that the gas extraction concentration and mixed flux increased by 3.16 times and 1.71 times respectively. Optimal selection for borehole parameters of liquid CO2 blasting helped to save cost and achieve the best effect of blasting.

Key words： numerical simulation gas extraction antireflection liquid CO2 blasting borehole parameters

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.0319 OR http://www.rockmech.org/EN/Y2016/V35/I3/524

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