顶板隔水层关键层耦合作用规律研究

在煤矿开采过程中，如果覆岩裂隙扩展至贯穿隔水层，则会诱发地下水或地表水大量涌向采场，导致煤矿淹井事故．利用RFPA^2D-Flow软件建立了隔水层关键层耦合的采场推进模型，计算并分析了裂隙场的发育和分布，绘制了顶板水渗流量曲线．讨论了与裂隙发育密切相关的覆岩支承压力与中间岩层厚度、关键层厚度及破断闻的关系．结果表明：关键层未破断时，中问岩层厚度对隔水层裂隙发育作用不明显；厚关键层对隔水层能起较好的保护作用．

Coupling Action of Water-Resisting Roof Layer and Key Strata

In coal mining, groundwater or surface water rushes into the mining field eventually to cause the mine flooding if some fractures in surrounding rock strata extend and run through a water-resisting layer. The coupling models of water-resisting layer and key strata were proposed using the software RFPA^2D-Flow. The development and distributing of the fracture fields were calculated and the roof seepages curves were drawn. The relations between the bearing pressure and the mid-stratum thickness, the key-stratum thickness, and the key-stratum breaking which were closely relative to fracture were particularly discussed. The results show that the midstratum thickness slightly influences the fracture extension of a water-resisting layer before the key-stratum breaking, and a thicker key-stratum can protect the water-resisting layer well.