钻孔水采法可用于开采埋深大、疏散的,不同粒度的矿产。在岩层顶板稳定的条件下,采用不充填采空区的空洞式开采法时,钻孔水采法可保证矿产回采率达到60%。但是,一些可用新方法开采的矿床,往往顶投岩石不稳定,允许的顶柱暴露不超过4—6米。因此,研究板顶不稳定条件下的钻孔水力采矿工艺是一项紧迫的科学任务,它可以扩大使用这种方法的 Drilling water mining method can be used for the exploitation of deep buried, evacuated, different size minerals. Under the condition of stable roof of the rock formation, when using the hollow mining method without filling goaf, drilling water mining method can ensure the recovery rate of mineral reaches 60%. However, some of the deposits that can be mined using the new method are often rock-top unstable and allow a top column exposure of no more than 4-6 meters. Therefore, studying the hydraulic drilling technology for drilling under unstable roof conditions is an urgent scientific task that can be extended to use this method