古城煤矿大跨度动压巷道支护技术研究

Support technology research on large-span dynamic pressure roadway in Gucheng Mine

针对古城煤矿大跨度动压巷道支护存在的问题,以北三盘区辅运大巷为研究背景,采用Fl AC3D有限元模拟在不同的巷道跨度侧压系数的增加,分析巷道围岩变形规律和矿压特征。模拟结果表明,巷道塑性破坏面积、第一主应力、两帮移近量以及顶板下沉量随侧压增大而扩大,随跨度增加而扩大。随着巷道跨度的增大,支护难度成倍增加,综合侧压系数、塑性区破坏面积、巷道宽高比均有变化,介绍了大跨度巷道分类方法及类型。提出大跨度巷道高强经济支护与控制方法及方案,并在现场应用监测巷道变形,结果表明,北三盘区辅运大巷支护效果较好,主要变形发生在第5~20 d,优化支护方案取得显著成效,为大跨度巷道提供示范。

Aiming at the problems existing in the support of large-span dynamic pressure roadway in Gucheng Mine,Flac3d finite element simulation was used to simulate the increase of lateral pressure coefficient in different roadway spans and sideways taking north three panel auxiliary transport roadway as the research background,and the surrounding rock deformation law and mineral pressure characteristics of the roadway were analyzed.The simulation results showed that the plastic failure area,the first principal stress,the two groups of approaching and the roof sinking amount of the roadway expanded with the increase of side pressure and expand with the increase of span.With the increase of the span of the roadway,the difficulty of support increased exponentially;Based on the side pressure coefficient,the failure area of the plastic zone and the aspect ratio of the roadway,the classification method and type of large-span roadway were given.The principle and control method of high-strength economic support of large-span roadway were proposed,the economic optimization support scheme was given,and the roadway deformation was monitored on site,the results showed that the supporting effect of auxiliary alley in north three panel auxiliary transport roadway was better,and the main deformation occured on the 5~20th day,and the optimization support scheme had achieved remarkable results,providing a demonstration effect for the large-span roadway.