2350煤矿河道改道后井下开采安全性分析

Safety Analysis of Underground Mining After Channel Diversion in 2350 Coal Mine

2350煤矿有大面积的煤层在河道下,属于水体下开采,水体下开采具有较多的危险性,为回收资源,且保障安全,拟将河流进行改道。为分析新河道下开采的安全性,在河道附近剖取六条剖面线,得出河床底部与1号煤层间的最小距离为232 m,而且1号煤层上覆岩层为三工河组隔水层,厚度约为172 m,河床下方无断裂导水构造。通过《"三下"采煤规程》中的计算公式得到1号和2号两层煤全采后导水裂隙带高度为152.8 m,根据防水煤柱留设方法,计算得到防水安全煤岩柱的高度为228.6 m。可见1号煤层与河床的最小距离大于防水煤岩柱的高度,在新河道下完全可以实现安全开采。

2350 a large area of coal seam under the river is under water.Coal Mining under water-bodies is more dangerous.In order to recover resources and ensure safety,we plan to transform the river.Safety analysis of the new channel of Postharvest underground mining,first near the river cut out the six profiles,the minimum distance and no bed bottom of No.1 coal seam between 232 m and the No.1 coal seam overburden three jurassicsangonghe aquifuge,the thickness is about 172 m non-fracture guide water structure.Through the calculation formula in the"three down"regulations,the height of the water guiding fractured zone is 152.8 m after the total two mining of the No.1 and the No.2 coal seam.According to the method of retaining the waterproof pillar,the height of the waterproof and safe coal pillar is calculated to be 228.6 m.It can be seen that the minimum distance between the No.1 layer and the river bed is greater than the height of the waterproof coal and rock column,and it is concluded that the safe mining can be achieved under the new river.