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Geomechanics and Engineering
  Volume 21, Number 2, April25 2020, pages 133-142
DOI: http://dx.doi.org/10.12989/gae.2020.21.2.133
 


Preliminary study on the ground behavior at shore connection of submerged floating tunnel using numerical analysis
Seok-Jun Kang, Jung-Tae Kim and Gye-Chun Cho

 
Abstract
    Submerged floating tunnel (SFT) is a type of tunnel which causes the tunnel segments to float in the water. When the SFTs are connected to the ground, the connection between the SFT and the subsea bored tunnel is fragile due to the difference in behavioral characteristics between the two types of tunnels. Therefore, special design and construction methods are needed to ensure the stability of the area around the connection. However, since previous research on the stability of the connection site has not been undertaken enough, the basic step necessitates the evaluation of ground behavior at the shore connection. In this study, the numerical analysis targeting the shore connection between the subsea bored tunnel and the SFT was simulated. The strain concentration at the shore connection was analyzed by numerical simulation and the effects of several factors were examined. The results showed the instability in the ground close to the shore connection due to the imbalance in the behavior of the two types of tunnels; the location of the strain concentration varies with different environmental and structural conditions. It is expected that the results from this study can be utilized in future studies to determine weak points in the shore connection between the submerged floating tunnel and the subsea bored tunnel, and devise methods to mitigate the risks.
 
Key Words
    submerged floating tunnel; shore connection; numerical analysis; external load; grouting material; joint design
 
Address
Seok-Jun Kang, Jung-Tae Kim and Gye-Chun Cho: Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea
 

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