Deveropment of Submerged Floating Tunnels in Shallow Water

Abstract

This paper describes the development process for tension legs type Submerged Floating tunnels (SFT) in shallow water. SFT is a completely new type of tunnels, unlike anything ever seen before. SFTs have attacked attentions as a new access to solve the problems not adequately dealt with by conventional structures. But, there are still many unknown factors, as no such structures.Therefore, Hokkaido University, Hokkaido Development Bureau and the Society Submerged Floating Tunnel Technology Research have studied on SFT technology, such as, design methods, tunnel structure, mooring systems, foundations, its construction in this several years. So, we are able to develop the design and construction methods for tension legs type Submerged Floating tunnels in shallow water.

Experimental Investigation of the Dynamic Behavior of Submerged Floating Tunnels under Regular Wave Conditions

“…The model cross sections are mainly circular and the loads mainly earthquake and wave current. Fujita [26] and Venkataramana et al [27] conducted SFT model tests in shallow water and concluded that the cable tension increased with wave period. Gan [28] tested SFTs under hydrostatic load and obtained the spatial stress distribution of the tube section.…”

Experiment on Pressure Characteristics of Submerged Floating Tunnel with Different Section Types Under Wave Condition

“…Scholars of the two countries are mainly devoted to the study of the motion characteristics of SFT under the action of waves in the fjord or shallow sea area. A Japanese scholar carried out a model test of a shallow water submerged floating tunnel [11,12]. It is believed that the tension of the anchor cable increases with the increase of the regular wave period.…”