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渗水泥化巷道锚杆支护可靠性差,导致此类巷道冒顶事故频发。通过典型岩样崩解和风化实验、渗水泥质巷道变形规律及锚杆锚固性能实测开展研究。结果表明:煤系地层含有黏土类矿物,使得巷道围岩遇水崩解,发生泥化现象,且风化脆裂,导致自身承载力急剧降低;渗水泥质巷道围岩变形破坏具有明显阶段性,演绎“减速变形-弱泥化-加速变形-强泥化-失稳”全过程,有效控制泥化进程是该类巷道稳定性控制的关键;提出了渗水泥化巷道围岩的控制技术,即新型“三高”锚杆强化控制技术和滞后注浆加固技术,给出巷道掘进后10~30 d最佳注浆时机,开展了典型的工程实践,取得了良好控制效果。
Seepage cementing roadway bolting reliability is poor, leading to such road roof fall accidents. Through the typical rock-like disintegration and weathering experiments, the deformation law of percolation roadways and the anchorage performance of anchors, the study was carried out. The results show that the clay-bearing minerals in coal-bearing strata cause the surrounding rock of the roadway to disintegrate with water, mud and weathering and brittle fracture, resulting in a sharp decrease of its own bearing capacity. The deformation and failure of surrounding rock of seepage- It is the key to the stability control of this kind of roadway that the whole process of “decelerating deformation-weak muddy-accelerating deformation-strong muddy-unstable” is deduced. , Namely the new “Three high” anchor reinforcement control technology and lag grouting reinforcement technology, gives the tunnel grouting 10 ~ 30 d after the best grouting timing, carried out a typical engineering practice and achieved good control effect.