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以任楼煤矿含水层上穿过F2断层组的中六运输大巷的安全开掘为工程背景,研究含水层上断层区巷道围岩控制技术。基于断层岩性组成,结合水文地质条件分析原岩应力、构造应力和水压等多种应力叠加特征,得到巷道开挖后围岩变形破坏规律:巷道在断层带10 m范围内变形破坏严重,同一标高断层上盘围岩破坏范围大于下盘,在含水层上方巷道底鼓量大。确定了巷道重点支护区域和加固的关键部位,并提出该类巷道的围岩控制技术:超前注浆、喷锚注阶段加固为基础支护,再实施关键部位锚索加固和围岩注浆技术。工程实践表明,采用区域化分阶段支护技术,巷道围岩变形得到有效控制。
Taking the safety excavation of the sixth-six transport lane crossing the F2 fault group on the aquifer of Renlou Mine as the engineering background, the research on the surrounding rock control technology for the laneway in the fault zone in the aquifer is studied. Based on the lithological composition of the fault and the hydrogeological conditions, the stress and water pressure stress superposition features are used to analyze the deformation and failure of the surrounding rock after tunneling. The deformation and destruction of the tunnel within 10 m of the fault zone are serious, The failure range of surrounding rock on the same elevation fault plate is larger than that of the lower plate, and the amount of drum at the bottom of the roadway above the aquifer is large. The key supporting areas of the roadway and the key parts of the reinforcement are determined, and the surrounding rock control technology of the roadway is put forward: advanced grouting, reinforcement with grouting and grouting as basic support, reinforcement of anchor cables in key parts and grouting of surrounding rock technology. Engineering practice shows that the use of regionalization of phased support technology, laneway deformation of surrounding rocks have been effectively controlled.