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隧道建设（中英文） ›› 2024, Vol. 44 ›› Issue (2): 225-232.DOI: 10.3973/j.issn.2096－4498.2024.02.002
Marcel ‘t Hart1, *, Arianna Minoretti2, Li Ying1
Marcel ‘t Hart1， Arianna Minoretti2, 李英1
摘要： Submerged floating tunnel (SFT or SFTB, submerged floating tube bridge) is a floating tube bridge, submerged at a defined position under the water level. In this study, four types of SFTs, such as shoreanchored, piersupported, pontoonstabilized, and mooring stabilized, are discussed. The main tubular structure of the SFTs can have several crosssection shapes and types, including dividing the carriageways into multipletubesystem, connected by transversal elements, to provide additional safety in case of fires and operability in case of accidents. Related guidelines for STFs are introduced. The International Federation of Structural Concrete has published, in 2020, a 〖WT５《TNR#I》〗Design Guideline for SFTBs〖WT５《TNR》〗 (〖WT５《TNR#I》〗fib〖WT５《TNR》〗 Bulletin No.96) to help the technical community with the design of solutions for SFTBs. The International Tunneling and Underground Space Association has published, in 2023, an 〖WT５《TNR#I》〗Owner's Guide to STFs〖WT５《TNR》〗 (〖WT５《TNR#I》〗Owner Guide〖WT５《TNR》〗) to help the infrastructure′s owners to understand when the SFT could be a competitive solution, especially comparing it to traditional tunnel solutions. Currently, the Norwegian national standards have been the first to include this structure in the bridge national handbook (2020). Furthermore, 21 cases/studies/designs/proposals of STFs are listed and the hot topics, including fluid structure interaction and impacts, are briefly introduced. The SFTs can reduce the main sea loads on the structure, the slopes of the tunnel and the connected structures, the length of the crossings, the disturbance to the undersea landscape, and the acoustic impact in the surrounding area. It is concluded that the growing attention on the topic of environment and the possibilities given by recent materials and technologies in reducing the climate impact will hopefully represent a new era of possibilities for the diffusion of this clever structure.
