突出煤层掘进工作面本煤层预抽瓦斯技术实践

为消除回采巷道掘进过程中煤与瓦斯突出危险,解决瓦斯涌出量大的问题,采用本煤层定向钻孔与普通钻孔相结合的瓦斯抽采方法,严格落实瓦斯抽放钻孔施工技术措施。实践表明,采取综合瓦斯抽采措施后,消除了突出危险,瓦斯抽采浓度最高达58%,掘进工作面瓦斯浓度控制在0.5%以下,巷道单月最高进尺达到200 m以上,保证了巷道掘进施工安全。

Technical Practice of Pre-draining Gas in Coal Seam of Driving Face at Outburst Coal Seam

In order to eliminate the danger of coal and gas outburst during the excavation of the mining roadway and solve the problem of large gas emission,the gas drainage method combining directional drilling of the coal seam and ordinary drilling is adopted to strictly implement the technical measures for gas drainage drilling.Practice shows that after adopting comprehensive gas drainage measures,the outburst danger is eliminated,the gas drainage concentration is up to 58%,the gas concentration in the driving face is controlled below 0.5%,and the maximum monthly footage of the tunnel is more than 200 m,which ensures the tunnel driving construction safety.