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| Study on CO2 pre-cracking and anti-reflection technology of 22613 working face of Guandi Mine |
| Yin Zeyu |
| Guandi Mine, Xishan Coal and Power Group, Taiyuan 030022, China |
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Abstract In view of the high gas and low permeability and difficult gas drainage in the 22613 working face of No. 6 mining areas in Guandi Mine, the CO2 pre-cracking and anti-reflection technology was proposed to improve the gas drainage efficiency. The field practice showed that the CO2 pre-cracking hole arrangement was 8 m, the best extraction effect was achieved. The CO2 pre-cracking measures increased the average single-hole gas drainage volume fraction of the coal seam by 1.2 times, with higher gas drainage in the later stage of the extraction. The mining volume achieved good drainage results and deserved further promotion.
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