作　　者： (杨景芬）; (徐宏杰）; (黄华州）;

机构地区： 安徽理工大学地球与环境学院,安徽淮南232001

出　　处： 《煤矿安全》 2017年第8期5-8,12,共5页

摘　　要： 探讨了特殊隔水关键层——"遮挡层"在卸压瓦斯抽采中的作用方式与机制,提出了遮挡层作用下的典型地层结构类型。研究结果表明:遮挡层是隔水关键层的1种特殊存在形式,根据遮挡层和被保护层所处相对位置及其在覆岩"三带"中的位置关系,划分了4类遮挡层地层结构类型,揭示叠加应力作用下岩体变形变位的挤压作用、软弱岩性矿物遇水膨胀堵塞作用、流体携带物质充填作用和裂隙发育强弱作用是遮挡层控制卸压瓦斯流态的主要作用机制。 We discuss the model of action and mechanism of special water-resisting key strata, a barrier layer in pressure relief gas extraction, and propose the typical structure for barrier layer. The results show that the barrier layer is a special form of water-resisting key strata. According to the relative position of barrier layer and protected coal seam and their position in the＂three zones＂of overburden rock, four stratigraphic structures of the barrier layer are divided. Further, the gas flow pattern is obtained, and there are four kinds of mechanisms of barrier layer to control the gas flow pattern. They are the compression of displacement and deformation of rock strata under the action of superimposed stress, the expansion and block effect of weak lithologic and minerals, the filling function of fluid carrying material, the fracture intensity.

关 键 词： 遮挡层 地层结构 卸压瓦斯抽采 导气裂隙通道 保护层开采