The gas content of No.15 coal seam in Tianchi Coal Mine is high and difficult to extract.There is a hidden danger of gas overrun in coal mining,and a coal cutting cycle takes more than 6 h,which seriously restricts the mining speed of the working face.In order to improve the mining efficiency,using the technical method of CO2 fracturing coal rock,the CO2 fracturing secondary anti-reflection and high-efficien-cy mining technology of outburst coal seam mining face is proposed.Through the experiment,it is found that after CO2 fracturing,the gas emission is reduced by 16.7%on average,and the efficient gas extraction un-der the condition of dense drilling can be realized,and the mining speed can be improved.The coal cutting speed increased from 2.11～2.91 knives/d before fracturing to 3.38～4.59 knives/d,with an average increase of 1.63 times.
关键词
CO2致裂技术/工作面瓦斯/二次增透/割煤速率
Key words
CO2 fracturing technology/working face gas/secondary anti-reflection/coal cutting rate
万方数据