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http://dx.doi.org/10.9711/KTAJ.2017.19.3.503

Study on flexible segment efficiency for seismic performance improvement of subsea tunnel  

Jang, Dong-In (Department of Civil Engineering, Hanseo University)
Kim, Jong-Ill (Department of Civil Engineering, Hanseo University)
Kwak, Chang-Won (Civil&Architecture Design Group, Korea District Heating Engineering Co.Ltd)
Park, Inn-Joon (Department of Civil Engineering, Hanseo University)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.19, no.3, 2017 , pp. 503-515 More about this Journal
Abstract
Underground structures that have recently become larger are required to be stable not only during normal times but also during earthquakes. Especially, it is very important to maintain the stability of the subsea tunnels during the earthquake. The objective of this paper is to verify the effectiveness of the flexible segment, which is one of the breakthrough facilities to maintain the stability of the subsea tunnel during the earthquake using the shaking table test. Another goal of this paper is to propose the optimum position of the flexible segment through 3D dynamic numerical analysis based on the verified results from shaking table tests. The 1g shaking table test considering the similarity ratio (1:100) to the cross section of the selected artificial subsea tunnel was carried out considering the Geongju and Artificial seismic waves, longitudinal and lateral wave, and with/without flexible segments eight times or more. As a result of the shaking table test, it was confirmed that the flexible segment is effective in improving the seismic performance of the undersea tunnel in all the experimental results. In addition, 3D dynamic numerical analysis was performed to select the optimum position of the flexible segment which is effective for improving seismic performance. As a result, it was confirmed that the seismic acceleration is attenuated when the flexible segment is installed adjacent to the branch section in subsea tunnel.
Keywords
Flexible segment; Subsea tunnel; Shaking table test; Geongju seismic wave; Artificial seismic waves;
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Times Cited By KSCI : 3  (Citation Analysis)
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