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针对煤矿巷道底板锚索孔钻进困难的问题,分析了正反循环钻进过程中粉渣运移特征,得出“钻渣三区”的相互作用是制约底板锚索孔快速钻进的根本原因,并提出了泵吸反循环钻进可以有效防止“钻渣三区”的形成。利用固液流体力学原理,推导了冲洗液沿程水力损失及钻渣液上返流速的力学公式。根据现场实际,得出底板锚索孔泵吸反循环钻进时钻孔深度、泵的真空度及钻渣液的上返速度与钻渣体积含量之间的关系,结果表明泵吸反循环对底板锚索孔的快速钻进是可行的。研制了一套泵吸反循环钻进系统,实现了底板锚索孔钻进与排渣同时作业。现场试验表明,钻进深度5.6 m的底板锚索孔有效钻进时间可以控制在30 min内,解决了底板锚索孔深孔钻进的难题,净化了作业环境。
In view of the difficulty of drilling the anchor hole in coal mine roadway floor, the characteristics of debris movement in both forward and reverse circulation drilling are analyzed. It is concluded that the interaction of “three zones of drilling residue” restricts the rapid drilling of the anchor hole The root cause and proposed pumping reverse circulation drilling can effectively prevent the formation of “three zones of drilling residue”. Based on the principle of solid-liquid hydrodynamics, the mechanical formula of hydraulic loss along the flow path and the velocity of the back-flow of the drilling fluid was deduced. According to the actual field, the relationship between the drilling depth, the degree of vacuum of the pump and the rate of return of the drilling fluid and the volume content of the drilling slag is obtained. The results show that the pump reverse circulation pair Quick drilling of the floor anchor hole is possible. A set of pump reverse circulation drilling system was developed to realize the simultaneous operation of drilling and slag discharging of the anchor bolt hole in the bottom plate. Field tests show that the effective drilling time of the bottom anchor hole with a drilling depth of 5.6 m can be controlled within 30 min, which solves the problem of deep hole drilling in the anchor plate anchor hole and purifies the working environment.