特厚煤层重复采动覆岩导水裂隙带高度发育规律

Height Development Law of Water-conducting Fractured Zone of Overlying Rock Under Repeated Mining in Extra-thick Coal Seam

以老虎台煤矿为研究对象,通过理论计算、数值模拟与微震现场监测等方法,确定特厚煤层重复采动覆岩导水裂隙带的发育高度及规律。结果表明:重复采动影响下,跨裂比为1.3,裂采比为7.6,预测55002工作面导水裂隙带发育高度为234.08m,与微震监测得到的实测值250m相近。研究结果能进一步为特厚煤层重复采动安全开采提供科学借鉴。

Taking Laohutai Coal Mine as the research object,the development height and law of the overlying water-conducting fractured zone of the extra-thick coal seam under repeated mining were determined through theoretical calculation,numerical simulation and microseismic field monitoring.The results show that under the influence of repeated mining,the span crack ratio is 1.3,and the split mining ratio is 7.6.It is predicted that the development height of water-conducting fractured zone in 55002 working face is 234.08 m,which is close to the measured value of 250 m obtained from microseismic monitoring.The research results can further provide scientific reference for the safe mining of repeated mining in extrathick coal seams.