Geomechanics and Engineering

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Dynamic behavior of submerged floating tunnels at the shore connection considering the use of flexible joints

  • Seok-Jun Kang (Department of Civil and Environmental Engineering, Korea Institute of Science and Technology) ;
  • Minhyeong Lee (Disposal Performance Demonstration Research Division, Korea Atomic Energy Research Institute) ;
  • Jun-Beom An (Department of Civil and Environmental Engineering, Korea Institute of Science and Technology) ;
  • Dong-Hyuk Lee (Department of Civil and Environmental Engineering, Korea Institute of Science and Technology) ;
  • Gye-Chun Cho (Department of Civil and Environmental Engineering, Korea Institute of Science and Technology)
  • Received : 2022.10.27
  • Accepted : 2023.03.15
  • Published : 2023.04.25
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Abstract

When a submerged floating tunnel is connected to the ground, there is a risk of stress concentration at the shore connection owing to the displacement imbalance caused by low confinement pressures in water and high confinement pressures in the ground. Here, the effects of the boundary condition and stiffness of the joints installed at the shore connection on the behaviors of a submerged floating tunnel and its shore connection were analyzed using a numerical method. The analysis results obtained with fixed and ground boundaries were similar due to the high stiffness of the ground boundary. However, the stability of the shore connection was found to be improved with the ground boundary as a small displacement was allowed at the boundary. The effect of the joint stiffness was evaluated by investigating the dynamic behavior of the submerged floating tunnel, the magnitude of the load acting on the bored tunnel, and the stress distribution at the shore connection. A lower joint stiffness was found to correspond to more effective relief of the stress concentration at the shore connection. However, it was confirmed that joints with low stiffness also increase the submerged floating tunnel displacement and decrease the frequency of the dynamic behavior, causing a risk of increased resonance when wave loads with low frequency are applied. Therefore, it is necessary to derive the optimal joint stiffness that can achieve both stress concentration relief and resonance prevention during the design of shore connections to secure their dynamic stability.

Keywords

Acknowledgement

The research described in this paper was financially supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2017R1A5A1014883).

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