Dynamic Response of the Shore Connection of Submerged Floating Tunnel Considering Ground Nonlinearity
Publication: Geo-Congress 2024
ABSTRACT
A submerged floating tunnel (SFT) is a newly proposed design for a tunnel that operates while floating in water. The submerged floating tunnel needs to be connected into the shore ground to provide an underwater route between continents. In the shore connection, there is a risk of stress concentration due to the displacement imbalance between the underground tunnel part under high confining stress and the underwater tunnel part under low confining stress. Therefore, it is necessary to analyze the behavior of the shore connection. The shore ground where the tunnel is connected exhibits nonlinear behavior according to the interaction between the ground and tunnel. Therefore, in this study, the nonlinear deformation of the ground and the resulting change in the dynamic behavior of the submerged floating tunnel were analyzed using a numerical method. The nonlinear response of the ground was observed considering various ground types and the design using elastic joints that can improve the dynamic stability of the shore connection. As a result, the ground, showing nonlinearity, affected the dynamic behavior of the underwater tunnel part, acting as a boundary. In the case of shore ground with high stiffness, the ground exhibited a low deformation, which causes a slight nonlinearity. However, the higher the stiffness of the ground, the higher the maximum stress generated in the shore connection. Accordingly, it is considered that using an elastic joint to allow high displacement under the elastic deformation range and to prevent nonlinear behavior of the ground is an appropriate design to ensure dynamic stability.
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Information & Authors
Information
Published In
Geo-Congress 2024
Pages: 325 - 334
History
Published online: Feb 22, 2024
ASCE Technical Topics:
- Coastal engineering
- Coasts, oceans, ports, and waterways engineering
- Continuum mechanics
- Deformation (mechanics)
- Elastic analysis
- Engineering mechanics
- Geotechnical engineering
- Hydraulic engineering
- Hydraulic properties
- Nonlinear response
- Shores
- Soil deformation
- Solid mechanics
- Structural analysis
- Structural behavior
- Structural engineering
- Structural mechanics
- Structures (by type)
- Submerging
- Tunnels
- Underwater structures
- Water and water resources
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