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针对水库下特厚煤层综放开采安全问题,采用地面钻孔冲洗液漏失量法、EH-4连续电导率剖面仪法,对大平煤矿N1S1工作面采动前后覆岩破坏及充水状况进行了探测,利用RFPA2D系统对覆岩变形破坏进行了反演和模拟。结果表明:覆岩破坏导水裂缝带发育在工作面采空区上方垂直方向卸压、水平方向拉伸区覆岩内,顶界面深度220.92 m,钻孔冲洗液漏失量平均0.50~0.71L/(s·m);白垩系砂及砂砾岩承压含水层下部微弱含水段处于导水裂缝带内,深度约200 m水平之下岩层呈充水状态,视电阻率20~40?·m;导水裂缝带上方,深度约120 m水平以下,岩层呈垂直方向卸压、水平方向压缩状态,离层破坏发育,不导水。水库下采煤是安全的。
Aiming at the safety of fully mechanized top coal caving mining in special thick seam, reservoir loss and water-filled condition of N1S1 working face before and after mining in Daping Coal Mine were investigated by EH-4 continuous conductivity profile method Detection and use of RFPA2D system inversion and simulation of overburden deformation and failure. The results show that the fractured water-carrying fractures of overlying strata develop in the vertical direction above the gob of the working face, and the depth of the inner and outer strata in the horizontal stretching zone is 220.92 m and the average amount of fluid leakage in drilling holes is 0.50-0.71L / s · m). The weak aquifer in the lower part of the confined aquifer of the Cretaceous sand and gravel rocks is in a water-conducting fracture zone. The rock formation is water-filled with a depth of about 200 m with an apparent resistivity of 20-40 m · m Above the water-rift zone, the depth is about 120 m below the level. The strata are decompressed in the vertical direction and compressed in the horizontal direction. The detachment of the strata develops and does not conduct water. Coal mining under the reservoir is safe.