所略四级水电站引水隧洞施工大塌方处理措施

Treatment measures for diversion tunnel construction massive landslides of Suolue Cascade IV Hydropower Project

结合所略四级水电站引水隧洞工程地质条件,分析开挖施工过程中发生大塌方的原因,根据工程地质特点,在隧洞大塌方处采用超前管棚支护+槽钢支护+钢筋混凝土衬砌的方案进行处理。施工过程中,严格控制施工质量,顺利通过了塌方段,完成了隧洞开挖任务,目前隧洞运行良好。

Combined with the engineering geological conditions of diversion tunnel of Suolue Cascade IV Hydropow-er Project,the author analyzed the causes for the massive landslides occurred during tunnel excavation. Treatment scheme was adopted according to the engineering geological characteristics,incorporating pipe shed advanced sup-port with U-steel support and reinforced concrete lining. The following construction was conducted under strict quality control,which ensured smooth advancing through the collapsed section and completion of tunnel excava-tion. The tunnel is operating well now.