巨厚砂砾含水层下大采高工作面安全开采研究

Study on Safe Mining of Large Mining Height Working Face Under Super-thick Sand-gravel Aquifer

以黄陇侏罗纪煤田李庄矿为研究背景,分析了矿区含、隔水层情况,采用仰孔注水测漏法对4201工作面不同开采高度向工作面导水裂缝带发育高度进行了探测。探测结果表明:采高为3.5~6 m时,裂采比为28~31.4。采高为3.5~4.5 m时,裂采比大;采高为5~5.5 m时,由于产生离层,上覆安定组泥岩发生弯曲下沉,部分裂隙发生了闭合,此时的裂采比大幅度减小;采高为6 m时,裂隙被贯通,裂采比再次增大。

Based on the research background of Lizhuang Mine in Huanglong Jurassic coalfield,the situation of aquifer and waterproof layer in the mining area is analyzed,and the upside hole water injection leakage detection method is used to explore the development height of water diversion fracture zone in the 4201 working face at different mining height.The detection results show that when the mining height is 3.5-6 m,the crack-mining ratio is 28-31.4.When the mining height is 3.5-4.5 m,the crack-mining ratio is large,and when the mining height is 5-5.5 m,due to the occurrence of separation,the mudstone of the overlying Anding group formation bends and sinks,part of the cracks are closed,and the crack-to-mining ratio is greatly reduced.When the mining height is 6 m,the crack is connected and the crack-to-mining ratio increases again.