高瓦斯矿井大直径长钻孔掩护巷道快速掘进技术

Rapid roadway heading technology of high-gas mines using large-diameter long boreholes

为了实现高瓦斯矿井巷道安全快速掘进,研究了大直径长钻孔掩护巷道安全快速掘进技术,利用孔径差异优化“两堵一注”封孔工艺,依据瓦斯含量实现煤巷瓦斯分级治理,提高了瓦斯灾害防治效果及巷道掘进速度。研究结果表明:大直径长钻孔掩护巷道掘进技术具有更好的卸压增透效果和更长的抽采时间,结合多孔径“两堵一注”封孔工艺,30d平均单孔瓦斯抽采浓度达到了80.2%,与常规边掘边抽钻孔相比提高3.1倍,平均瓦斯抽采纯量高达0.44 m 3/min,与常规边掘边抽钻孔相比提高10.3倍,采用该技术的巷道瓦斯浓度保持在0.27%~0.40%,月进尺达到了400 m,实现了巷道安全快速掘进。

In order to realize safe and rapid roadway heading of high-gas mines,the safe and rapid roadway heading technology using large-diameter long boreholes is studied,the“two plugs and one injection”borehole sealing technology is optimized based on the aperture difference,and the coal roadway gas grading control is realized according to the gas content,which improves the prevention and control effect of gas disasters and the roadway heading speed.The research results show that proposed heading technology has better pressure relief and permeability enhancement effect and longer extraction time,which was combined with the multi-aperture“two plugs and one injection”sealing technology,the average single-hole gas extraction concentration reached 80.2%in 30 days,and the average gas extraction volume reaches 0.44 m 3/min,which is 3.1 times and 10.3 times higher than that of conventional measures of heading and gas extraction;using this technology,the gas concentration of the roadway is maintained at 0.27%~0.40%,and the monthly heading length reaches 400m,the safe and rapid roadway heading is realized.