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

Abstract

Submerged floating tunnel (SFT for short) is a special underwater traffic structure, and wave load is one of the main environmental loads of SFT structure. In this paper, the 1:60 physical model test of three kinds of SFT in a two-dimensional wave flume is tested. The effects of random irregular waves on the SFT structure under different wave heights and periods are discussed. The study shows that: (1) Compared with circular and polygonal sections, there are multiple local peaks in the elliptical section during the period. with the increase of wave height, the number of local peaks also increases. It suggests that the rotational moment plays an important role in the elliptical section which has a relatively small depth-width ratio. (2) The position of the maximum and minimum pressure in the three kinds of SFT sections is consistent. Their vertical wave forces are all larger than their horizontal wave forces. The increase of vertical wave force relative to horizontal wave force in polygon section is larger than that in elliptical section, and the difference in the circular section is the smallest. (3) Under the same traffic condition, the wave force of the elliptical and polygon section is smaller, but they are more sensitive to the change of wave height, and the increase is obvious. The distribution of wave force in the circular section is more uniform.

Solution to the traffic problems of long and deep water straits–smart submerged floating tunnel and its research

“…Although in the past decade, scholars or engineers from the world have done a lot of researches and exploration, which includes the preliminary design of engineering structures, the combination of SFT load and limit state design method, mechanical analysis and dynamic response behavior of SFTs and components , fluid-structure coupling mechanism [17,19,[35][36][37], the experimental test and study [35,[38][39][40][41][42][43][44][45][46], the behavior of SFTs under action of accidental load, such as, preliminary studies on vibration response mechanism and prevention measures under general impact load, seismic excitation, explosion and blast impacts and partial failure of anchor cables [4,[19][20][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62], and corresponding construction simulation [63], construction technologies and equipment, durability analysis, smart monitoring and early warning system of anchor cables, SFT and environment [64][65][66]. But the working behavior and mechanism of the SFT under complex sea waters is not very clear, there is a certain distance from making the specification of design and construction methods or guide for SFT etc.…”

Parametric Study on Mooring System Design of Submerged Floating Tunnel under Extreme Wave and Seismic Excitation

“…Seo et al [19] compared their numerical simulation model with experiments to assess its accuracy. Li et al [20] studied the pressure characteristics of different tunnel shapes with pressure sensors around SFTs. Yang et al [21] conducted parametric studies with varying factors, such as BWRs, water depths, wave heights, inclination angles of mooring lines, and wave periods.…”

Numerical Analysis of the Impact Parameters on the Dynamic Response of a Submerged Floating Tunnel under Coupling Waves and Flows

“…The model test is an important method for investigating the SFT's dynamic response. Many researchers have studied the SFTs' response under the action of waves, flows, or wave-flow coupling [10][11][12][13]. They mainly focused on the motion of the six degrees of freedom of the SFT, tunnel pipe acceleration, anchor cable tension, and tunnel pipe section pressure.…”