胡家河煤矿导水裂隙带发育高度研究

Research on the development height of water flowing fracture zone in Hujiahe coal mine

导水裂隙带高度是煤层顶板水害防治中需要考虑的关键因素。胡家河煤矿采用综采放顶煤工艺开采4#煤层,在采放高度达到13 m时,应用"三下规范"中两个公式计算出的导水裂隙带发育高度分别为58. 88 m和82. 11 m,通过RFPA数值模拟表明计算值与实际值相差较大。当工作面推进到140 m时,导水裂隙带发育高度达到最大值204 m,其后不再随工作面的推进而向上发育。钻孔冲洗液漏失量观测结果表明,导水裂隙带发育高度为225 m。综合确定胡家河煤矿导水裂隙带发育高度为225 m,裂采比为17. 3。

The height of water flowing fracture zone is the key factor in coal mine water prevention and control.Hujiahe coal mine adopts fully mechanized caving technology to mine No.4 coal seam,and the mining height reaches 13m.The development height of water flowing fracture zone is calculated by"three under"regulations as 58.88-82.11m,simulated by RFPA as 204m,and observed by borehole flushing fluid leakage as 225m.The calculated value is quite different from the observed value.The comprehensive analysis shows that the development height of water flowing fracture zone in Hujiahe coal mine is 225m,and the ratio of fracture height to mining height is 17.3.