复合水体下急倾斜煤层开采的水害防治研究

淮南孔集煤矿山西组A1、A3煤层总厚6m，为第四系含水砂层下底板岩溶水上复合含水体威胁的急倾斜煤层。对于砂层水害防治，采用合理留设防水煤柱，沿用“小阶段、长走向、间歇开采”的方式方法；对于底板岩溶水患防治，采用“疏水降压、限压开采”的防治水方法；对于局部抽冒及流水钻孔涌砂造成地表抽冒漏斗及岩溶塌陷漏斗，采取了“按尺核产、严禁超限出煤”、“小流量、长历时、控砂疏水”的有力措施。实现了安全开采，取得了良好的效果。

A study on prevention and cure to harmful water of mining in deep incline coal seam under complex containing water body

Coal seam (A1 plus A3) is 6m thick in Shanxi Formation, Kongji Coal Mine. Coal seam A1 and A3 are deep incline coal seams between upper containing water sandstone and lower karst water body (it is called complex containing water body) . To prevention and cure the harmful water of sandstone, the suitable coal block is remained and the method of "small phrase, long trend and interval mining " is followed. To prevention and cure the harmful karst water of coal bottom, the method of "discharge water to drop water pressure and mining under certain pressure " is adopted .It gain a good results both on economy benefit and on mining safety .