Preliminary Analysis on Vibration Problems of Submerged Floating Tunnel and Model Test Design

Abstract

Submerged floating tunnel (SFT) is a novel type of cross-sea traffic structure, which is different from the traditional bridge and immersed tunnel. With the help of its own buoyancy to balance the operational loads, SFT shows great potential for crossing long, large, and deep waterways. Since floating in the underwater environment all year around, SFT has to face a series of vibration problems during the operation. In this paper, some vibration problems of SFT, such as wave-induced vibration, vortex-induced vibration, vibration caused by accidental loading, and vehicle-induced vibration, are summarized. In the meantime, combined with the features of SFT, the test model is designed and manufactured in the work. The geometric scale ratio of the whole model is about 1:100. Some aluminum tubes, connected by the flanges, are used for simulating the main body of SFT. Two plexiglass boxes provide the platform for the model test car to move in the aluminum tubes. The cable force, displacement, and acceleration at the points in the control sections of the tube are monitored during the model test. The whole experimental work provides a meaningful reference and solid foundation for further study on vibration problems of SFT.KeywordsSubmerged floating tunnelModel designFluid-vehicle-tunnel interactionExperimental study