王洼煤矿软岩巷道变形破坏及支护对策

Deformation and fracture and its supporting measures in soft rock roadway in Wangwa coal mine

为了有效控制软岩回采巷道的变形破坏,对王洼1522-1工作面回采巷道进行了围岩结构、力学参数、岩石成分和现场监测分析。研究表明,巷道顶底板属遇水膨胀软岩,全煤巷道煤层内裂隙发育,端头锚固的长度对锚固支护的有效性差,难以形成有效的承载结构。现有支护条件下围岩应力不能保持平衡,巷道顶底板和两帮变形大,底鼓严重,满足不了软岩回采巷道围岩变形要求。在实验和实测的基础上,得到了软岩回采巷道的变形破坏原因,提出了全长锚固支护方式及合理参数,取得了良好的应用效果。

In order to effectively control the deformation and failure of soft rock entry, rock structure and physical mechanics parameters and ingredient and field monitoring have been used in 1522-1 mining entry. Experiments indicate that the roof and floor belong to swelling soft rock and that the fractures in coal are well generated. Thus the reliability of the end bolt and bolt strength is depressed and difficult to form stability and effective load bearing structure. The support way can’t make rock-mass stress ba-lanced, with the deformation of roof-floor and sides big and floor protrude serious. It can’t meet the re-quirement of deformation character of surrounding rock in the soft rock roadway. Based on experiments and field monitoring, the cause of deformation and failure of weakness rock mining roadway is obtained. The full length anchoring bolt and net support and reasonable parameter are put forward, which achieves good application effect.