针对团柏煤矿下组煤开采时水文地质条件的复杂性,运用突水系数理论计算和采用底板破坏过程有限元RFPA2D数值模拟分析方法,对该矿下组11号煤层开采时的4底板突水危险性做出了综合评价.研究表明:陷落柱较为发育的11号煤底板突水系数0.05 MPa/m,接近底板受构造破坏块段临界突水系数;由数值模拟结果看,该煤层开采时底板岩层的破坏深度约15 m,破坏带底部距下伏奥灰含水层仅约10 m.基于上述水文地质综合分析结论提出了该煤层开采时底板突水隐患的预防和治理对策.%According to the complexity of the hydrological conditions of the lower group seam mining in Tuanbai Mine, the water inrush theoretical calculation and the finite element RFPA2 FEM numerical simulation analysis method of the floor failure process was applied to the comprehensive evaluation on the floor water inrush danger occurred during the mining in the No. 11 seam of the lower group in the mine. The study results showed that the sink hole well developed No. 11 seam would have a floor water inrush coefficient of 0.05 Mpa/m which was closed to the critical water inrush coefficient of the floor structure failure block section. The numerical simulation results showed that during the seam mining period, the failure depth in the floor strata was about 15 m and the distance between the failure zone bottom to the roof of the underlying Ordovician limestone aquifer was about 10 m. Based on the above hydrological comprehensive analysis conclu sion, the prevention and control countermeasures of the floor water inrush hidden dangers occurred during the seam mining were provided.
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