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西洱河三级电站引水隧洞的施工支洞是水电部进行新奥法施工的试点。支洞全长305米,设计断面为由两种曲率组成的马蹄形:上半拱为4.5米,边墙和仰拱为4.9米,面积共20米~2。由于洞线穿越区域性的F_(64).断层阻隔的蓄水构造,洞顶静水头达30～90米,开挖中围岩出水
The construction branch of the diversion tunnel of the Xierhe III hydropower station is a pilot project conducted by the Ministry of Electric Power and Electricity for the construction of the new Austrian law. The total length of the branch hole is 305 meters. The design section is a horseshoe shape composed of two curvatures: the upper half-arch is 4.5 meters, the side wall and the inverted arch are 4.9 meters, and the total area is 20-2. As the hole line through the regional F_ (64). Impacted by the impoundment of the water structure, the top of the head of the water level of 30 to 90 meters, excavated surrounding rock water