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以某矿南翼回风大巷为例,分析了软岩巷道变形破坏原因,并结合数值模拟软件FLAC4.0分析了该巷道围岩变形发展规律:肩角较顶板、两帮和底板变形破坏的区域更大,并且随时间推移巷道浅部围岩的变形不断增大,即空间上的非均匀性以及时间上的持久延续性.针对软岩巷道的变形特性,提出了分区域分阶段动态控制技术,包括:锚网喷支护、注浆加固以及重点部位加强支护.现场的工业性实验观测结果表明,该巷道围岩变形逐步趋于稳定,变形量得到了有效控制,可以满足使用的要求.
Taking the return airway in the south wing of a mine as an example, the cause of deformation and failure of soft rock roadway is analyzed. Combined with numerical simulation software FLAC4.0, the deformation law of the surrounding rock of the roadway is analyzed. Shoulder angle is lower than that of roof, , And the deformation of the surrounding rock in the shallow part of the laneway increases with time, that is to say, the spatial inhomogeneity and the lasting continuity in time.According to the deformation characteristics of the soft rock roadway, the staged dynamic The control technology includes: bolting and shotcreting support, grouting reinforcement and reinforce support of key parts.Industrial experimental observations show that the surrounding rock deformation of the roadway tends to be stable and the deformation is effectively controlled and can be used Request.