Paper Title
A Study on Submerged Floating Tunnels

Abstract
The submerged floating tunnel concept was first conceived at the century, but no actual project was undertaken until recently. As the needs of society for regional growth and the protection of the environment have assumed increased importance, in the wider context the submerged floating tunnel offers new opportunities. The submerged floating tunnel is an innovative concept for crossing waterways, utilizing the law buoyancy to support the structure at a moderate and convenient depth. The submerged floating Tunnelis a tube like structure mode of steel and concrete utilizing the law of buoyancy. It supported on columns or held in place by tethers attached to the sea floor or by pontoons floating on the other sidewhere it can be conveniently SFT or Archimedes Bridge, may be used. However, swell, vortex shedding and slowly varying internal waves due to layers of different salinity presented a hazard of significant dynamic oscillations. In addition to the challenge of these various conditions some common accidental situations have to be solved for all applications including fire, sinking ships, falling anchors as well as sudden massive water ingress into the tube. Combining with the characteristics of submerged floating tunnel (SFT) and surrounding environment, it is of great theoretical and practical significance to develop research in the areas of potential risk and impact factors, risk index system, risk level of SFT. Risk management workflow of SFT was given. Then we focused on discussing the potential risks of SFT in investment, design, and environmental condition during planning and feasibility study stage.