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Seismic Response Simulation of Submerged Floating Tunnel with Tension Legs: A Case Study on the Qiongzhou Strait Crossing Tunnel Project
(1. School of Civil Engineering, Tsinghua University, Beijing 100084; 2. China Northeast Architectural Design & Research Institute Co., Ltd., Shenyang 110006)
Abstract Submerged floating tunnels (SFTs) are less affected by the depth of water, undersea topography and geo? logical conditions, and are less costly than deep-buried tunnels and immersed tube tunnels. However, there are still major technical problems to be overcome for their better application. This paper uses the Qiongzhou Strait crossing unnel project as a study case to conduct an analysis of the static load and dynamic response of SFT structures, taking into account the joint action of earthquake-induced hydrodynamic load, dead weight, buoyancy and other loads.Furthermore, this paper also integrates the use of the Rayleigh damping equation and Morison equation to carry out a tentative study on the calculation of additional damping of SFTs. The results show that, in the static analysis, the maximum cross-sectional bending normal stress occurs at the bottom plate where the two ends are embedded with the rock formation, while in the dynamic time-course analysis, the displacement in the X-direction (axial) is larger than that in both the Y- and Z-directions under the influence of seismic waves; As SFTs with tension legs are most likely to have problems with the cables under the influence of seismic action, it is necessary to pay more attention to the dynamic performance of the cables in the mooring system to ensure the stability and safety of an SFT structure.
Abstract：
Submerged floating tunnels (SFTs) are less affected by the depth of water, undersea topography and geo? logical conditions, and are less costly than deep-buried tunnels and immersed tube tunnels. However, there are still major technical problems to be overcome for their better application. This paper uses the Qiongzhou Strait crossing unnel project as a study case to conduct an analysis of the static load and dynamic response of SFT structures, taking into account the joint action of earthquake-induced hydrodynamic load, dead weight, buoyancy and other loads.Furthermore, this paper also integrates the use of the Rayleigh damping equation and Morison equation to carry out a tentative study on the calculation of additional damping of SFTs. The results show that, in the static analysis, the maximum cross-sectional bending normal stress occurs at the bottom plate where the two ends are embedded with the rock formation, while in the dynamic time-course analysis, the displacement in the X-direction (axial) is larger than that in both the Y- and Z-directions under the influence of seismic waves; As SFTs with tension legs are most likely to have problems with the cables under the influence of seismic action, it is necessary to pay more attention to the dynamic performance of the cables in the mooring system to ensure the stability and safety of an SFT structure.
LI Hao1 CHENG Xiaohui1 YU Hanliang1 FU Dan1,
2
.Seismic Response Simulation of Submerged Floating Tunnel with Tension Legs: A Case Study on the Qiongzhou Strait Crossing Tunnel Project[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(3): 146-154
2022, Vol. 59 