Challenge in Design and Construction of Submerged Floating Tunnel and State-of-art

Submerged Floating Tunnel (SFT) is a new type of transport structure. It is different from the general bridges and tunnels engineering, it has a significant advantage over conventional structures in crossing long, large and deep water areas. Hence, SFT has great potential for development of infrastructures in crossing straits. Aiming at features of SFT, this article discuses some challenges and problems, which are faced in design and construction of SFT, such as wave load determination, vortex-induced vibration, immigration and reduction of accidental load and situation, durability, innovational construction method, risk identification and control etc. The state-of-art and works done by Zhejiang University in the relative areas of SFT were introduced. The technological difficulties and corresponding solution were proposed. At last, the several key problems to be needed further research were proposed, so as to provide reference for the design, construction and project risk analysis of future SFT.