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针对山东某煤矿在微山湖下重复开采3上、3下煤的问题,采用GPS-RTK技术实测了湖区地表移动变形值,运用“双端堵水器”技术采用井下打仰上孔方法,实测了3上、3下煤开采覆岩导水裂缝带发育高度,并建立了地表下沉、水平移动拟合方程。运用FLAC3D数值模拟数据建立了此煤层重复开采中间岩体与岩层移动边界函数方程表达式,揭示该煤层重复开采对地表移动与岩体移动变形特征,对水体下安全开采具重大意义,对地质采矿条件类同的矿区也有参考借鉴价值。
Aiming at the problem of repeated mining of 3 and 3 coal under a Weishan Lake in a coal mine in Shandong Province, the surface deformation value of the lake was measured by GPS-RTK technique. The “double-ended water trap” Method, the development height of water-conducting fractured zone of overburden strata under 3, 3 coal mining was measured and the fitting equation of surface subsidence and horizontal movement was established. The FLAC3D numerical simulation data is used to establish the expressions of the equations for the movement of the intermediate rock mass and the rock formation during the repeated mining of the coal seam. It reveals the characteristics of surface movement and rock mass deformation due to the repeated mining of the coal seam and is of great significance for safe mining under water. Conditions similar to the mining area also have reference value.