色连二矿多煤层开采对导水裂隙带高度影响的数值模拟探讨

Numerical simulation of the influence of multi-seam mining on the height of water-conducting fracture zone in Serian No.2 Mine

导水裂隙带高度确定对煤矿水害防治及煤炭高效开采具有深远意义。为研究多煤层开采导水裂隙带发育规律,以色连二矿5号煤层为研究对象,采用理论分析和UDEC软件数值模拟的方法,研究色连二矿的3,4,5号煤层依次开挖对覆岩层导水裂隙带发育高度的影响情况。结果表明,运用数值模拟的手段预测的3、4和5煤层导水裂缝带高度分别为38 m、50 m和70 m,其中开采4-1上煤对3-1煤导高有一定影响,开采5-1上煤促进4-1上煤导高进一步增大,且影响程度较大,对3-1煤导高具有较小的促进作用。该成果为色连二矿5煤层安全高效开采提供了理论技术支持。

The determination of the height of water-conducting fracture zone is of great significance to the prevention and control of water damage in coal mines and the efficient mining of coal.In order to study the development law of water-conducting fracture zone in multi-coal seam mining,taking No.5 coal seam of Serian No.2 Mine as the research object,the influence of excavation of No.3,4,and 5 coal seams on the development height of water-conducting fracture zone of overlaying rock in Serian No.2 Mine in sequence is studied by theoretical analysis and numerical simulation of UDEC software.The results show that the height of the water-conducting fracture zone in coal seam^(3),4 and 5 predicted by numerical simulation is 38 m,50 m and 70 m,respectively.Mining 4-1 top coal has a certain influence on 3-1 top coal conductivity,mining 5-1 top coal promotes 4-1 top coal conductivity to further increase,and the influence degree is large,while it has a small promotion effect on 3-1 top coal conductivity.The results provide theoretical and technical support for the safe and efficient mining of 5 coal seam in Serian No.2 Mine.