淮河下采煤矿井隔水层合理厚度研究

THE STUDY OF RATIONAL BARRIER THICKNESS UNDER HUAIHE-RIVER

本文从水文地质学角度出发,根据实际情况建立渗流模型,利用计算机模拟方法,研究上覆水体经保护层向采空区的渗流情况,求得淮河下采煤时二种不同水文地质条件下的安全保护层厚度。研究得出:当第四系泥灰岩组为结晶质泥灰岩时,它起不到隔水作用,起隔水作用的是煤系地层,其安全保护层厚度为15m,当第四系泥灰岩组为粘土夹砾石时,仅需留设6.3m厚的泥灰岩组就可起到有效隔水的作用,整个采区下渗水量将不超过0.4m^3/min。矿井开采上限可作较大的提高。

In this paper,seepage models are put forward in the view of hydrogeology,which are based on the actual situation.By using the computer simulation method,authors get thicknesses of safe protection layers of two hydrogeology condition when mining under Huai-river,and study the leakage from the upper aquifer to the mining face.The result shows that the barrier is the coal deposits,not the Quartenary mudstone,when it is composed of crystal mudstone,and the thickness of the barrier is 15 meters.If the Quartenary layer is composed of mudstone,containing clay and gravels,only the layer of thickness of 6.5 meters can protect the water effectively.The leakage of the whole mining area is less than 0.4 m^3/min.So the mining upper limit can be raised greatly.