“三软”煤层穿层钻孔水力冲孔影响半径测定研究

The Measure Research on Radius of Draining Hole Influenced by Water Stress of “Three Soft” Coal Seam

为有效解决郑煤集团超化煤矿针对"三软"煤层赋存不稳定,煤层透气性差,煤层瓦斯局部积聚等原因,导致钻孔成型差、封孔难,长时间冲孔易导致钻孔堵塞,使单孔抽放浓度衰减快,抽放效果差的难题,提出测定水力冲孔影响半径的方法,得出水力冲孔影响半径准确数值,同时为类似条件矿井提供参考。

In order to effectively solve the unstable of the ocurrence of ＂Three Soil＂coal seam of Chaohua coal mine of Zhengmei Group,and the bad breathability of coal seam and the gas partly gather,which cause the bad molding of draining hale and the difficulty of hole sealing,and the long time punching may cause the blocking of draining hole,which make the bad result of gas drainage,this thesis put forward the method of measure the radius of draining hole influenced by water stress,and find out the exact value of radius of draining hole influenced by water stress, and could offer reference to coal mine with similar condition.