某大型湖底明挖隧道钢围堰设计要点

Design Essentials of Steel Cofferdam for a Large Open Excavation Tunnel at Bottom of Lake

摘要:

湖底隧道施工多采用明挖或盾构的方式。其中，采用明挖法施工时需要设计围堰为隧道围护和主体结构施工提供条件。钢围堰具有施工效率高、环境影响小、可重复利用、安全性高等一系列优点，而现阶段针对湖底明挖隧道的钢围堰设计尚无成熟的理论体系。通过基于某大型湖底明挖隧道对其钢围堰的设计进行讨论，形成了一些初步的经验，以供后续类似工程参考。

Abstract:

Shield or open excavation is often used in the construction of tunnels at the bottom of lake, in which the cofferdam should be designed to provide conditions for the construction of tunnel enclosure and main structure during the open excavation construction. Steel cofferdam has a series of advantages, such as high construction efficiency, small environmental impact, reutilization and high safety. However, there is no mature theoretical system for steel cofferdam design of open excavation tunnel at the bottom of lake at present. The design of the steel cofferdam based on a large open excavation tunnel at the bottom of the lake is discussed, and some preliminary experience is formed for reference of similar projects in the future.