摘要
针对大跨度矩形巷道的大变形与破坏问题,以漳村煤矿+480 m水平行人大巷Ⅰ段为例,通过现场调查和理论分析研究了巷道变形破坏机理,研究发现该巷道工程地质条件差、巷道围岩所处应力水平高、设计支护形式不能适应围岩变形要求、施工管理不到位是导致该巷道变形和破坏程度严重的主要原因。结合巷道变形破坏机制,借助于工程类比、数值模拟计算等方法得到了返修巷道的锚固参数,对+480 m水平行人大巷Ⅰ段试验段巷道提出了以"整体加固+局部补强"为核心的"注浆+锚网索喷+底板锚索"的联合支护方式。应用表明:经过60 d监测,巷道两帮收敛量最大值仅为84 mm,顶底板移近量最大值仅为125 mm,围岩变形处于稳定状态,保证了巷道的正常使用。
In view of the large deformation and failure of long-span rectangular roadway, taking the I section of pedestrian roadway at +480 m level in Zhangcun Coal Mine as an example, the mechanism of roadway deformation and failure is studied through field investigation and theoretical analysis. It is found that the engineering geological conditions are poor, the stress level of roadway surrounding rock is high, the design support form cannot adapt to the deformation requirements of surrounding rock,and the construction management is not in place, which is the main reason for the serious deformation and damage of the roadway.Combined with the deformation and failure mechanism of the roadway, the anchoring parameters of the repaired roadway are obtained by means of engineering analogy and numerical simulation,and the joint support method of "grouting + anchor net cable spray + floor anchor cable"with the core of "integral reinforcement + local reinforcement"was proposed for the roadway of section I of the +480 m horizontal pedestrian tunnel. The application shows that after 60 days of monitoring, the maximum convergence of the two sides is only 84 mm, and the maximum distance between the top and bottom panels is only 125 mm. The surrounding rock deformation is in a stable state, which ensures the normal use of the roadway.
引文
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