ABSTRACT:

Based on displacement potential functions, this paper deduces the formulae for determining the hydrodynamic pressure on Submerged Floating Tunnel with anchor restraints when plane SV-wave is incident. Submarine rock and soil is taken as elastic half-space, while seawater is taken as ideal fluid and anchors as springs. Besides, effects of submarine rock and soil parameters, incident SV-wave parameters, and anchor parameters on the hydrodynamic pressures are discussed. It could be concluded that all the parameters have great influence upon the hydrodynamic pressure on Submerged Floating Tunnel except the submarine rock and soil density.

INTRODUCTION

Many fixed crossings of waterways have been built, such as bridge, pontoon bridge, floating bridge, bored tunnel, and immersed tunnel. In the case of long-crossing, deep-water, hard sea state, however, conventional crossings are not feasible (Kunisu, Mizuno and Saeki, 1994). A Submerged Floating Tunnel (SFT) can be an alternative, which is a structure somewhere in between a traditional bridge over the sea and an embedded tunnel in the sea bottom, anchored by a support system such as pontoons on the sea surface or anchoring in the seawater. Compared with long span cable-stayed and suspension bridges, the increase of cost with span length is slow for the SFT. Submerged Floating Tunnels will also be favorable if interference with the landscape and scenic view is to be minimized (Remseth, Leira, Okstad and Mathisen, 1999). Furthermore, Submerged Floating Tunnels may save surface space in a better way and at the same time protect the environment against noise and pollution from road and rail traffic. Since seawater has no shear resistance, the horizontal motion of the sea bottom does not move the seawater. Nevertheless, the vertical motion moves the water and causes a hydrodynamic force that acts on SFT (Morita, Yamashita, Mizuno, Mineta and Kurosaki, 1994).

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