低透气性煤层底板岩巷穿层钻孔瓦斯抽采技术

Gas Drainage Technology by Drilling Through Seam in Floor Rock Roadway of Low Permeability Coal Seam

为了加大高瓦斯矿井瓦斯治理效果,保证煤巷安全掘进,实现抽掘采平衡,在没有合适条件保护层的情况下,优先采用煤层底板岩巷穿层钻孔预抽瓦斯。赵庄矿1307掘进工作面采用这一方法进行瓦斯预抽,原煤瓦斯含量降低至5.2~7.78m^3/t,抽采效果优于顺层钻孔,确保了矿井安全生产。

In order to increase the effect of gas control in high gas mine,ensure safe driving of coal roadway and realize the balance of extraction and mining,in the absence of suitable protective layer,the preferred method is to pre-drain gas by drilling through strata in coal seam floor rock roadway.In Zhaozhuang Mine 1307 heading face,this method is used to pre-drain gas,and the content of raw coal gas is reduced to 5.2~7.78m^3/t,the extraction effect is better than that of drilling along the seam,which ensures the safe production of the mine.