煤层底板受岩溶承压水的威胁,影响安全生产,在华北类型的煤层开采中是普遍存在的问题。近年来,我局在深入了解本矿区矿床水文地质条件的基础上,实行留煤柱、底板加固,“双降”(即人工放顶提前释放矿山压力、疏水降压)带压开采底板受岩溶承压水威胁的煤层,使突水量和突水次数大大减少,保证了安全生产。现将我们的做法和粗浅认识介绍于下. The coal seam floor is threatened by karst confined water and affects safety in production, which is a common problem in the mining of North China type coal seam. In recent years, on the basis of in-depth understanding of hydrogeological conditions of ore deposits in the mine area, the Bureau implemented the method of retaining coal pillar and floor reinforcement and adopting “double-drop” (that is, manual caving to release mine pressure and hydrophobic step-down pressure in advance) Seam pressure threat to the coal, so that the amount of water inrush and greatly reduce the frequency to ensure safe production. Now our approach and superficial understanding introduced below.