桂中治旱乐滩水库引水灌区一期工程隧洞设计

摘要

乐滩水库引水灌区一期工程隧洞12座，总长为48.77 km，均为无压隧洞，针对隧洞从村屯附近穿越、长距离、低水头、大流量的特点，设计有针对性地提出了一些新观点。结合工程实际，从洞线选择、进出口布置、合理加大隧洞水深、减糙衬砌混凝土使用、TBM法施工应用等简述其设计要点。%Letan Reservoir Irrigation Zone 1st -stage Project is designed with 12 free-flow tunnels with a total length of 48.77km. Some new design concepts were put forward in view of the features of tunnels such as passing nearby villages,long distance,low water head and high flow. A brief introduction was made on the key points of de-sign in respects of tunnel line selection,arrangement of tunnel inlet and outlet,rational increase of water depth in tunnel,application of less rough concrete lining and TBM construction method.