大直径钻孔代替上隅角悬管抽采应用效果分析

Application Effect of Large Diameter Drilling instead of Upper Corner Suspension Pipe Extraction

为了解决采空区上隅角瓦斯抽放难的问题,提出大直径钻孔瓦斯抽采技术,以孔代巷对采空区上隅角瓦斯进行抽采,利用数值模拟软件对不同抽采负压及钻孔直径下钻孔瓦斯流量进行分析,确定最佳抽采负压为-30 kPa,最佳钻孔直径为130 mm。确定施工参数后对大直径钻孔抽采瓦斯抽放进行工业化试验发现,当使用大直径钻孔进行上隅角瓦斯抽采时,上隅角瓦斯浓度维持在0.2%,抽放效果较佳。同时通过对比经济效益验证了大直径钻孔瓦斯抽采的优越性,可为矿井瓦斯治理提供一定的参考。

In order to solve the problem of difficult gas extraction in the upper corner of the mining area, the gas extraction technology of large diameter borehole is proposed to extract gas from the upper corner of the mining area by using holes instead of alleys, and the gas flow of the borehole under different extraction negative pressure and borehole diameter is analyzed by using numerical simulation software to determine the best extraction negative pressure of-30 kPa and the best borehole diameter of 130 mm. The industrial test of gas extraction found that when the upper corner gas extraction was carried out using large diameter drill holes, the gas concentration in the upper corner was maintained at 0.2% and the extraction effect was better. At the same time, the superiority of gas extraction by large diameter borehole was verified by comparing the economic benefits, which provides some reference for mine gas management.