糯扎渡水电站3号导流隧洞渐变段开挖施工

Excavation construction of the transition section of the diversion tunnel in Nuozhadu hydropower station

结合糯扎渡水电站3号导流隧洞进口渐变段设计及地质情况,阐述了渐变段施工应具备的边界条件及基本原则,对地表预加固施工方案及程序、洞内系统支护进行了论述,并提出了安全、质量控制措施。

Combined with the transition section design of No. 3 diversion tunnel entry in Nuozhadu hydropower station and the geological conditions, the paper describes the boundary conditions and the basic principles in the transition Section construction, discusses the construction scheme and the program of the advanced reinforcement from the ground, and the system support in the tunnel, puts forward the safety control measures and the quality control measures.