高应力软弱围岩回采巷道破坏机理及控制

    Damage Mechanism and Control of Mining Roadway in High Stress and Weak Surrounding Rock

    • 摘要: 针对赵固一矿11271运输巷大变形的难题,综合现场调研、地应力测试、钻孔窥视及理论分析等方法,对其变形特征及破坏机理进行了详细剖析,认为高应力、围岩软弱、强采动影响和现有支护参数不合理是11271运输巷围岩产生大变形破坏的主要原因,以高预应力与预应力扩散为原则、锚杆锚索协调支护和强帮支护作用机理为指导,对原支护方案进行了优化。现场实测表明,新支护方案下11271运输巷的两帮移近量和底鼓量分别为222 mm和110 mm,较原支护方案分别减少了72.3%和78.0%,可有效控制围岩变形,满足安全生产要求。

       

      Abstract: Concerning the problem of large deformation of 11271 transportation roadway in Zhaogu No.1 mine, the characteristics of deformation and failure mechanism are analyzed by means of field investigation, ground-stress testing, borehole imaging and theoretical analysis. It is considered that high stress, weak surrounding rock, strong mining influence and unreasonable support parameters are the main reasons for large deformation of 11271 transportation roadway. Guided by high pre-stress and pre-stress diffusion, coordination support of bolts and cables, and strong support in two-side, the original support program is optimized. Field observation shows that the two-side displacement and bottom heave is 222 mm and 110 mm in the new support program, respectively decreased by 72.3% and 78.0% comparing with the original one, which can effectively control the surrounding rock deformation and meet safe production requirement.

       

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