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深井中等稳定顶板沿空留巷锚注切顶支护技术研究

Research on bolting and cutting support technology for moderatelystable roof of gob side entry retained in deep mine

  • 摘要: 为解决深井高应力沿空巷道围岩变形大、支护困难的问题,以孙村煤矿2216工作面地质和开采条件为背景,采用数值模拟软件FLAC3D建立计算模型,分析比较了采用普通锚索、普通锚索+巷旁切顶和注浆锚索+巷旁切顶3种支护方案时,深井高应力沿空巷道围岩应力和变形破坏规律。研究结果表明:与前2种支护方案相比,采用注浆锚索+巷旁切顶支护方案时,顶底板及两帮变形量分别减小了22.2%和19.8%,实体煤和巷旁单体支柱受力分别降低了13.5%和77.8%,控制围岩效果更好。现场试验验证表明,2216工作面回风巷采用注浆锚索+巷旁切顶方案进行改进支护后,第1个工作面回采结束时,顶底板和两帮最大移近量分别为270 mm和120 mm;下个工作面推进至测站位置时,顶底板和两帮累计移近量分别为533 mm和171 mm,围岩变形得到了有效控制,可较好地解决该类巷道支护问题。

     

    Abstract: In order to solve the problem of large deformation and support of surrounding rock in high-rise roadway with deep stress, this paper takes the geologic and mining conditions of No. 2216 working face of Suncun Coal Mine as the research target. Using the methods of numerical simulation and field practice, this paper compares the the surrounding rock stress and deformation and failure of high stress along the roadway in deep mine when three supporting schemes, namely the general anchor cable, roadside cutting roof plus grouting anchor cable and roadside cutting roof are used. The test results show that compared with the first two support schemes, the deformation of roof and floor and two sides are reduced by 22.2% and 19.8%, respectively, when using the grouting anchor cable plus roadside cutting support scheme, while the stress by the solid coal and the single pillars along the roadway are reduced by 13.5% and 77.8%, respectively. The effect of controlling surrounding rock are better. Field test results show that after the No.2216 working face return airway adopts the grouting anchor cable plus lane cutting plan to improve the support, the maximum moving amount of the top floor and the two sides are 270 mm and 120 mm respectively when the first return working face is finished; when the next working face is advanced to the station, the cumulative displacement of the top and floor and the two sides are 533 mm and 171 mm respectively, and the deformation of surrounding rock is effectively controlled, which can better solve the problem of roadway support.

     

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