突出煤层回采工作面综合消突技术实践

Practices on Comprehensive Outburst Elimination Technology of Coal Mining Face in Outburst Seam

为了快速消除回采工作面区域煤体的突出危险性,同时降低巷道掘进期间回风流中的瓦斯浓度,提出了交叉钻孔与网格钻孔相结合的综合抽采技术措施。在九里山矿16021回采工作面的试验结果表明:在采取综合技术措施后,16021回采工作面突出危险性预测超标率为零,16021运输巷回风流瓦斯体积分数由未实施综合技术措施前的0.8%降至0.4%,与本煤层顺层钻孔预抽区段煤层瓦斯相比,抽采消突时间能够降低1/3以上,可见交叉钻孔与网格钻孔相结合的综合抽采技术措施是可行的。

In order to rapidly eliminate outburst dangers of the regional coal mass in the coal mining face and to reduce the gas content of the air retuning flow during the gateway driving period, a comprehensive gas drainage technical measures combined with crossed boreholes and grid boreholes were provided. A trial was conducted in No. 16021 coal mining face of Jiulishan Mine. The results showed that after the comprehensive technical measures conducted, the gas over limit rate of the outburst danger predicted for No. 16021 coal mining face was zero and the gas volume fraction of the air retuning flow in the transportation gateway was reduced from 0. 8% before the comprehensive technical measures conducted to 0. 4%. In comparison with the seam gas in the pre-drainage section with boreholes along in the mining seam, the gas drainage and outburst eliminated time could be reduced over 1/3. Therefore, the comprehensive drainage technical measure combined with the crossed boreholes and grid boreholes were feasible.