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带压开采是解决受底板突水威胁煤层的有效方法之一;而底板隔水层阻隔水能力是影响带压开采安全性的重要因素.运用理论分析、物理试验和数值模拟手段,就底板隔水层的不同岩层岩性特征对其阻隔水性能的影响进行研究,得到了工作面推进过程中底板隔水岩层的变形、应力及破坏特征和渗流分布特征,讨论了3种组合情况下底板隔水层的结构稳定性和渗流稳定性,比较分析了软、硬岩层的不同组成方式对底板隔水性能的影响.
Pressure mining is one of the effective methods to solve the coal seam which is threatened by floor water inrush. However, the water barrier of floor aquifuge is an important factor that affects the safety of pressure mining. By means of theoretical analysis, physical experiment and numerical simulation, The influence of lithology characteristics of different rock strata in water layer on its barrier water properties was studied. The deformation, stress and failure characteristics and seepage distribution characteristics of rock strata with bottom strata during the working face advancement were obtained. The structural stability and seepage stability of the water layer are analyzed. The influence of different compositions of the soft and hard rock layers on the water barrier performance of the floor is analyzed.