龙泉煤矿4301工作面导水裂隙带动态发育高度研究

Dynamic Development Height of Water-conducting Fracture Zone in No.4301 Working Face of Longquan Coal Mine

针对龙泉煤矿4301大采高综放工作面顶板砂岩裂隙水易突水涌入工作面的开采难题,采用理论分析和数值模拟两种研究方法,探究了4301工作面开采过程中导水裂隙带发育高度的动态演化规律。数值模拟研究表明,4301工作面推进距离小于96 m时,导水裂隙带的发育高度随工作面推进而不断增加,发育最大高度约为75 m;工作面推进距离大于96 m后,导水裂隙带发育高度变化较小,基本稳定于75 m。该研究结果与理论分析所得导水裂隙带发育范围在57~75 m基本吻合,表明数值模拟结果具有一定合理性;工作面覆岩上方K4、K5含水砂岩层处于导水裂隙带发育范围内,保水开采中应重点考虑K4、K5含水砂岩层不被破坏。研究成果揭示了龙泉煤矿4#煤层开采导水裂隙带动态发育特征及其终态发育高度,对于4#煤层开采中覆岩含水层受扰动范围的确定具有重要意义。该研究成果可为类似条件下煤炭资源的安全与绿色开采提供一定参考。

The sandstone fracture water in the roof is prone to sudden water inrush into the No.4301 large-mining-height fully mechanized caving face of Longquan Mine.To address this problem,theoretical analysis and numerical simulation were used to explore the dynamic evolution of the development height of water-conducting fracture zones during the mining of the working face.The numerical simulation shows that when the advancing distance of the No.4301 working face is less than 96 meters,the development height of the water-conducting fracture zone increases with the advance of the working face and the maximum development height is about 75 meters;when it is greater than 96 meters,the development height of the water-conducting fracture zone changes slightly and stabilizes at 75 meters.The results are consistent with the theoretical analysis of the development range of the water-conducting fracture zone from 57 to 75 m,indicating that the numerical simulation results are reasonable.The K4 and K5 water-bearing sandstone layers above the overlying rock of the working face are within the development range of water-conducting fracture zones.During the water-preserving mining,we should focus on preventing the K4 and K5 water-bearing sandstone layers from being damaged.The research results reveal the dynamic development characteristics and final development height of the water-conducting fracture zone in the mining of the No.4 coal seam in Longquan Mine,which is of great significance for the determination of the disturbance range of the overlying rock aquifer.It could provide a reference for the safe and green mining of coal resources under similar conditions.