多煤层开采覆岩导水通道发育规律研究

Research on Development Rule of Overlying Rock Aqueduct in Multi-seam Mining

运用理论计算与数值模拟方法,研究了兴华煤矿8801工作面开采上覆岩层导水裂隙带发育特征。理论计算表明:导水裂隙带高度超过4#煤与8#煤的层间距,8801工作面开采存在水害威胁;FLAC3D数值模拟结果表明:采宽为80 m时,塑性区贯通层间岩体,形成采空区积水导水通道,采宽为200 m时,产生2条导水通道;开采至320 m处覆岩破坏产生导水通道贯穿层间岩体,开采至820 m,开切眼位置产生向断层方向延伸的塑性区,形成组合型导水通道。。

By using the theoretical calculation and numerical simulation,the developmental characteristics of the water-bearing fractured zone in overlying strata mining in 8801 working face of Xinghua coal mine is studied.The theoretical calculation shows that the height of water-conducting fractured zone is more than that of coal 4 and coal 8,and the risk of water damage exists in 8801 working face.The FLAC^3D numerical simulation results show that when the mining width is 80 m,the plastic zone will penetrate the interlayer rock mass to form the aqueduct channel.When the mining width is 200 m,two aqueducts are produced.When the mining area reaches 320 m,the aqueduct leads to the aqueduct which runs through the interlaminar rock mass and mining to 820 m,a plastic zone extending to the fault direction is produced at the open cut eye position,forming a combination type water channel.