某水电站引水隧洞线路及洞径设计

Design of the Route and Diameter of the Diversion Tunnel in a Hydropower Station

国外某水电站引水隧洞工程区域地质条件复杂,裂隙及断层发育,确定其线路及洞径是设计的重点及难点。基于该工程的基本地质条件,针对输水流量、覆盖层厚度、围岩稳定、施工条件及工期控制和工程投资等,确定了既满足工程安全又经济的最优隧洞线路;并通过流量、过水断面面积、流速、水头损失、经济性等对比确定了合理的洞径。

The design of the route and diameter of the diversion tunnel in a hydropower station is of great difficulty due to the complex regional geological conditions and developed cracks and faults.Based on the basic geological conditions of the project,the optimal route of the tunnel that satisfies both the engineering safety and economic requirements is selected considering the water flow,overburden depth,surrounding rock stability,construction conditions and control of the construction duration and investment.Then,a rational diameter of the tunnel is determined considering the water flow,cross section area,flow velocity,head loss and economy.