贵州省纳坝水库小流量引水隧洞优化设计

Optimal design of small flow diversion tunnel of Naba Reservior in Guizhou Province

贵州省纳坝水库引水隧洞为小流量小断面隧洞,施工难度大。为了加快施工进度、控制工程投资及确保施工安全,通过优化隧洞布置,取消了右岸引水隧洞,采用左岸由导流洞改建的泄洪洞中布置引水钢管的方式,将3条隧洞合而为一,节约工程投资达53万元。工程运行至今,防洪度汛、供水和灌溉等运行状况良好。研究成果对其他类似工程的设计有借鉴作用。

The diversion tunnel of Naba Reservoir in Guizhou Province is a tunnel with small flow and cross-section and the construction is difficult.To speed up the construction progress,control the engineering investment and en⁃sure the construction safety,the arrangement of the tunnel was optimized,in which,the diversion tunnel at the right bank in the original layout was canceled and the steel pipe was laid inside the spillway tunnel reconstructed from the diversion tunnel at the left bank.The optimized scheme combines three tunnels into one,and saved the cost of 0.53 million.After completion,the reservoir functions play well in flood control,water supply and irrigation.