向家坝水电站引水隧洞布置设计

Arrangement Design of the Water Diversion Tunnel in Xiangjiaba Hydropower Station

向家坝水电站采用中部开发方式,引水尾水系统比较长。受地形地质条件的限制,下游采用变顶高尾水洞代替了尾水调压室,上游则采用加大洞径、减小引水隧洞长度的手段取消了上游调压室。通过对向家坝水电站引水隧洞的布置设计进行总结,为类似引水隧洞处于调压室临界位置的工程设计提供参考和借鉴。

The Xiangjiaba Hydropower Station adopts the middle development way so that its diversion tailrace system is comparatively long. As for the limitation of geological conditions, there is no place for the surge tank. So, the tailrace tunnel with sloping ceiling is adopted at downstream, while the dimension of diversion tunnel is enlarged and the length is reduced in upstream. This paper sums up the experience of the arrangement design of water diversion tunnel in Xiangjiaba Hydropower Station, which could provide reference for the engineering design of similar diversion tunnel.