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水体下采煤,露岩冒落和导水裂隙带高度数据,是合理留设防水煤岩柱,实现安全开采的依据.在以往实践中,由于钻孔在到达临界面之前,水量、水位时常出现异常变化,因而往往给正确判定临界面的位置造成困难乃至错判.本文在分析淮南矿区不同条件下的数百个观测孔的实际资料的基础上,提出了判断导水裂隙带临界面位置的标志.这些标志,在实际工作中可以借鉴.根据钻孔单位耗水量的大小,文中将导水裂隙带临界面划分为弱、中等、强、极强等四种类型.
Under the water body, coal mining, rockfall and water-conducting fractured zone height data, is to reasonably set up waterproof coal pillar, to achieve safe mining based on.In the past practice, due to the drilling before reaching the critical surface, water, water often It is often difficult or even wrong to correctly determine the location of the critical interface.On the basis of analyzing the actual data of hundreds of observation holes under different conditions in Huainan mining area, These marks can be used for reference in practical work.According to the size of water consumption of drilling units, the paper divides the critical surface of water-conducting fracture zone into four types, weak, medium, strong and extremely strong.