Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Geomechanics and Engineering Volume 33, Number 1, April10 2023 , pages 101-112 DOI: https://doi.org/10.12989/gae.2023.33.1.101 |
|
|
|
Dynamic behavior of submerged floating tunnels at the shore connection considering the use of flexible joints |
||
Seok-Jun Kang, Minhyeong Lee, Jun-Beom An, Dong-Hyuk Lee and Gye-Chun Cho
|
||
| 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. | ||
| Key Words | ||
| ground boundary; flexible joint; numerical method; shore connection; submerged floating tunnel | ||
| Address | ||
| Seok-Jun Kang, Jun-Beom An, Dong-Hyuk Lee and Gye-Chun Cho: Department of Civil and Environmental Engineering, Korean Advanced Institute for Science and Technology 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea Minhyeong Lee: Disposal Performance Demonstration Research Division, Korea Atomic Energy Research Institute, 111 Daedeok-daero 989Beon-gil, Yuseong-gu, Daejeon, Republic of Korea | ||