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

Wang, Fang; Ke, Li; Huang, Bo; Cheng, Liang; Ding, Hao

doi:10.3390/jmse10111623

Cited by 8 publications

(3 citation statements)

References 21 publications

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“…Submerged Floating Tunnel (SFT) is a new type of deep-water and long-distance trans-sea transportation infrastructure [1], which can not only serve vehicles such as cars and trains; but also lay various pipes and cables, thus can greatly reduce the time cost of trans-sea transportation [2]. The advantages of SFT, which are less affected by weather and seabed topography, do not interfere with the navigation of sea vessels, can operate continuously, convenient wiring and low construction cost, make it extremely competitive [3,4]. SFT is usually composed of tube sections, support systems, tube joints, shore connection structures and internal facilities.…”

Section: Introductionmentioning

confidence: 99%

Dynamic responses analysis of submerged floating tunnel under impact load

Wang,

Qiao,

Zhou

et al. 2024

Brodogradnja

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Submerged floating tunnel (SFT) may be subjected to sudden impact loads such as submarine and shipwreck. Besides the local damage caused by impact, the overall transient dynamic response may also affect its driving safety. Based on the dynamic impact finite element software, the full-length model, and the locally truncated accurate model with solid element of the SFT are established respectively. By applying different spring stiffness constraints on the boundary of the truncated model, its first three modes are consistent with the full-length model, thus their dynamic characteristics are basically the same. The truncated model is further used to simulate the impact of a massive object on the SFT under different impact velocities, impact mass, impact angles and impact positions. The velocity and mass of the impact object have positive influences on the peak contact force, the displacement amplitude of the tube and the length of the damaged area. When the impact angle is perpendicular to the SFT tube, the contact force, displacement amplitude and the damaged area are the largest. The change of the impact position has little effect on the contact force and the damage area, but it will affect the distribution of displacement amplitude.

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Section: Introductionmentioning

confidence: 99%

Dynamic responses analysis of submerged floating tunnel under impact load

Wang,

Qiao,

Zhou

et al. 2024

Brodogradnja

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“…Won et al [22] verified SFT experiments by studying different wave periods. Wang et al [23] investigated the effects of wave height and wave period on SFT by changing the physical model experiment scale. Shekari et al [24] compared the results of two-dimensional numerical simulations with physical model experiments to study the bi-directional effects of earthquakes on the flow-structure coupling of SFT.…”

Section: Introductionmentioning

confidence: 99%

Effect of Stratified Flow on the Vibration of Anchor Cables in a Submerged Floating Tunnel

Xiong,

Sang,

Shi

et al. 2024

JMSE

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This study investigates the vertical-type submerged floating tunnel with anchor cables. Based on the characteristics of the anchor cables, the anchor cables are simplified as a nonlinear beam model with hinged ends. Disregarding the axial displacement of the tunnel body, the loads will cause displacements in the x and z directions of the tunnel body. The vibrations of the anchor cables are decomposed into three directions, and the parameter excitation at the connection point between the anchor cables and the tunnel body is taken into account. The equations of motion for the three degrees of freedom of the anchor cables are established using Hamilton’s principle, and then the three equations are solved using the Galerkin method and the fourth-order Runge–Kutta method. The basic characteristics of an internal wave stratified flow acting on the anchor cables are considered, as well as the influence of the incident angle of the ocean currents on the three degrees of freedom of the anchor cables. The results indicate that (1) stratified flow weakens the first- and third-order vortex-induced vibrations of the anchor cables while enhancing the second-order vortex-induced vibrations. When considering the parameter excitation of the anchor cables, the first- and third-order vibrations are weakened, while the second-order vibration remains significant; (2) the first-order vibration of the anchor cables reaches its maximum value when the transverse oscillation frequency of the tunnel body is twice its natural frequency, and the second-order vibration of the anchor cables reaches its maximum value when the transverse oscillation frequency of the tunnel body is twice its natural frequency; (3) the downstream vibration of the anchor cables increases with the increase in the incident angle of the ocean currents, the cross-flow vibration of the anchor cables decreases with the increase in the incident angle of the ocean currents, and the axial vibration of the anchor cables reaches its maximum value when the incident angle of the ocean currents is 60 degrees; (4) stratified flow weakens the lock-in phenomenon of the anchor cables, and the influence of the 1/2 stratified flow on the vibrations of the anchor cables is greater than the influence of the 1/2 stratified flow.

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“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Xu,

Song,

Liu

et al. 2023

Sustainability

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The Submerged Floating Tunnel (SFT) is a highly promising cross-sea transportation structure. Due to its body being suspended in water, waves and flows are the primary environmental loads it encounters. Existing numerical simulations have been based on potential flow theory, which fails to fully consider shear forces and the nonlinear characteristics of the flow field. To overcome this limitation, the Computational Fluid Dynamics (CFD) approach, relying on solving the Navier-Stokes equations, can be employed. In this study, we establish a CFD model for the SFT and analyze the impact mechanisms of wave-flow coupling on its dynamic response, considering parameters such as wave height, flow velocity, wave direction, and flow direction. With increasing wave height, the acceleration, mooring tension, and heave amplitude of the SFT significantly increase, and the nonlinear characteristics of its dynamic response become more pronounced. For example, when wave height, Hi, increases from 0.046 m to 0.138 m, the maximum value of dimensionless heave, δz/Hi, increases from 0.075 to 0.284, nearly quadrupling in magnitude. When waves and flows propagate in the same direction, the heave amplitude of the SFT increases compared to the case with waves acting alone, while sway and roll amplitudes decrease. Under conditions of higher flow velocity, the SFT displaces significantly along the direction of flow and water depth, deviating significantly from its original equilibrium position. At this point, the tunnel primarily experiences periodic forces due to vortex shedding, and the anchor chain on the downstream side remains slack. In scenarios where waves and flows propagate in opposite directions, both the maximum acceleration and mooring tension of the SFT increase significantly. For instance, the onshore tension of the cable, Fon, increases by 36%, while the offshore tension, Foff, increases by 89%.

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

Cited by 8 publications

References 21 publications

Dynamic responses analysis of submerged floating tunnel under impact load

Dynamic responses analysis of submerged floating tunnel under impact load

Effect of Stratified Flow on the Vibration of Anchor Cables in a Submerged Floating Tunnel

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

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