灵新煤矿导水裂隙带发育高度数值模拟研究

Numerical simulation study of development height of water flowing fractured zone in Lingxin Coalmine

煤矿的开采利用给国民经济发展带来巨大的收益,但也引发了许多环境地质问题,特别在煤层开采过程中,煤层上覆基岩变形破坏形成的裂隙通道极易发生矿井涌(突)水事故,时刻威胁着井下工人的生命安全。本文以灵新煤矿051505工作面为研究对象,利用Flac3D数值模拟软件,对14号主采煤层上覆基岩导水裂隙带高度进行了模拟研究。模拟结果表明:当煤层开采厚度为2.5 m时,导水裂隙带发育最大高度为59.5 m。同时选取经验公式法对导水裂隙带高度进行了计算。最终通过钻孔实测法得到的结果与前两种方法对比分析,数值模拟结果与钻孔实测结果基本吻合,认为数值模拟方法能够高效、简单、合理达到预测导水裂隙带高度的目的,也为同类矿井安全、绿色生产提供一定的借鉴。

The exploitation of coal mines has brought great benefits to the development of the national economy,but it has also caused many environmental geological problems,especially in the process of coal seam mining,where the fracture channel formed by deformation and failure of the overlying bedrock in coal seams is prone to mine gushing(figure)water accidents,threatening the lives of underground workers at any time.In this paper,taking the 051505 working face of Lingxin Mine as the research object,the height of the water flowing fractured zone in the overlying bedrock in the No.14 main mining coal seam is simulated by using the Flac3D numerical simulation software.The simulation results show that when the mining thickness of the coal seam is 2.5m,the maximum height of the water flowing fractured zone is 59.5m.At the same time,the empirical formula method is selected to calculate the height of the water flowing fractured zone.Finally,the results obtained by borehole measurements are compared with the first two methods.The numerical simulation results are in good agreement with the measured borehole results.It is concluded that the numerical simulation method can achieve the purpose of predicting the height of the water flowing fractured zone efficiently,simply and reasonably.It also provides some reference for the safety and green production of the similar mines.