新集二矿210108掘进工作面瓦斯综合治理技术研究

Comprehensive Gas Control Technology in No.210108 Driving Face in Xinji Mine Ⅱ

为掩护掘进工作面安全快速地掘进,采用分源预测法对新集二矿210108工作面机巷掘进期间的瓦斯涌出量进行预测计算,依据结果选取底板穿层钻孔掩护预抽机巷、顺层钻孔预抽煤巷条带及煤层瓦斯的消突技术。结果表明,新集二矿210108工作面机巷掘进期间瓦斯抽采率为17.9%,钻屑瓦斯解吸指标最大值为100Pa,钻屑量指标最大值为3.9kg/m,经预抽效果检验合格;回风流瓦斯浓度为0.1%~0.56%,瓦斯涌出量范围为0.84m3/min^5.4m3/min,其中掘进的前57d两者的统计结果要比57d以后的值大得多,表明机巷瓦斯涌出受煤层厚度变化的影响较大,当煤层厚度增大时,瓦斯涌出量显著增加。

In order to excavate driving face safely and rapidly,different-source forecast method was used to predict the gas emission during advancing of No.210108 face in Xinji Mine II.Based on this,pre-drainage machine lane covered by boreholes through floor,pre-drainage coal roadways along seam,and gas outburst elimination technology were selected.The results show that the gas drainage rate of the No.210108 mechanized caving face is 17.9%,the maximum gas desorption index of drill-cuttings 100 Pa,and the maximum drill-cutting index 3.9 kg/m.Prepumping effect test is qualified.The gas concentration of return air flow ranges from 0.1% to0.56% and the gas emission ranges from 0.84 m3/min to 5.4 m3/min.Both data in the first 57 days are much larger than those after the 57 days,which shows that the gas emission is greatly affected by the thickness of coal seam：when the coal seam thickness increases,the gas emission increases significantly.