天花板水电站引水隧洞设计

Diversion Tunnel Design for Tianhuaban Hydropower Station

天花板水电站引水隧洞全长2 514.01 m,沿线Ⅳ、Ⅴ类围岩段长度达到总长度的54.93%,隧洞内径8.2 m,开挖洞径最大10.2 m,在开挖、支护过程中遇到了塌方段。对稳定性较差的围岩采用全断面钢格栅拱架支护,对塌方部位喷聚丙烯纤维混凝土,对塌方影响部位作加固处理。

The total length of diversion tunnel in Tianhuaban Hydropower Station is 2 514.01 m, the inner diameter and maximum excavation diameter is 8.2 m and 10.2 m respectively. The length of IV and V-classed surrounding rocks is about 54.93% to tunnel length. The landslide was occurred in the excavation. The weak surrounding rocks are designed to support with full-face steel grille arch, and the landslide section are reinforced by spraying polypropylene fiber reinforced concrete.