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我矿是井采矿山，矿体延伸至-720m以下，采用的是自上而下的采矿方法，采空区用充填料灌满，用来减小下层采场的压力。为节约成本，选用选矿厂的尾沙作充填料，用水沙充填法进行充填，尾沙在采空区沉淀时，水就流到下层中段经水沟至水仓。但在实际工作中，水从上层流到下层时，势必会带着尾沙一起流到下层中段，有时产生冒沙把巷道堵塞，使下层运矿设备无法工作。因没有好的办法清沙，就用装岩机铲沙，但经过一段时间后，发现装岩机行走系统的寿命大大降低，大修频繁。
Mine mine is a well mine, the ore body extends to -720m below, using a top-down mining method, goaf filled with filling material used to reduce the pressure of the lower stope. In order to save the cost, choose the tailings of the ore dressing plant as the filling material and fill it with water and sand filling method. When the tailings sand settles in the goaf, the water flows to the middle of the lower layer and flows to the water tank through the ditch. However, in actual work, when water flows from the upper strata to the lower strata, it is bound to flow to the middle section of the lower layer with the tailings sand, sometimes causing sand to block the roadway and make the lower ore conveying equipment unable to work. Because there is no good way to clear the sand, the rock loader is used to shovel the sand, but after a period of time, it is found that the life of the rock loader traveling system is greatly reduced and overhauls are frequent.