带压开采条件下急倾斜煤层底板隔水性能探查研究

Steeply Inclined Coal Floor Impermeability Probing in Mining under Safe Water Pressure of Aquifer

急倾斜煤层带压开采较水平及缓倾斜煤层存在的突水潜在威胁较大。为了有效防范底板突水情况的发生,昌华煤矿在带压开采急倾斜5号煤层时,于井下布置了三个钻孔,采用了钻孔"三量"观测、压水试验和岩石力学测试等方法,对煤层底板隔水层进行了探查。探查成果表明:5号煤层底板至奥灰顶界隔水层隔水性能较好,厚度适中,且奥灰顶面下约50 m亦可作为相对隔水层,对防护开采5号煤层突水危险较为有利。

Comparing with horizontal and gently inclined coal seams, the water bursting potential threat is larger during steeply inclined coal seam mining under safe water pressure of aquifer. To effectively prevent floor water bursting, during the steeply inclined coal seam No.5 mining under safe water pressure in the Changhua coalmine has laid out 3 boreholes underground, using＂3 items＂observation,packer permeability test and rock mechanical test carried out coal floor aquifuge exploring. The result has shown that the impermeability of aquifuge between coal seam No.5 floor to top of Ordovician limestone is rather good with moderate thickness. Besides, 50 m below Ordovician limestone top can be a relative aquifuge propitious to prevent water bursting hazard during the mining of coal seam No.5.