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http://dx.doi.org/10.9711/KTAJ.2020.22.1.059

Fundamental study on enlargement method of existing subway tunnel during operation for sidetrack construction  

Lee, Hyobum (School of Civil, Environmental and Architectural Engineering, Korea University)
Koh, Sung-Yil (Seoha Engineering Co., Ltd.)
Jun, Jonghun (School of Civil, Environmental and Architectural Engineering, Korea University)
Yoon, Hee Taek (Advanced Railroad Civil Engineering Division, Korea Railroad Research Institute)
Yi, Na Hyun (Advanced Railroad Civil Engineering Division, Korea Railroad Research Institute)
Choi, Hangseok (School of Civil, Environmental and Architectural Engineering, Korea University)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.22, no.1, 2020 , pp. 59-76 More about this Journal
Abstract
As a continuous increase in demand for the transportation infrastructure in the metropolitan area, the renovation of existing metropolitan and urban railway lines for the rapid transport system requires the construction of sidetrack that can operate local and express trains simultaneously. However, the construction of sidetrack after stopping the operation of the existing subway line causes a lot of economic losses, therefore it is essential to study the tunnel enlargement scheme during the operation of the existing subway tunnel. Accordingly, in this paper, basic research on the enlargement plan of the existing subway tunnel was carried out for the renovation of the existing subway line. In order to investigate the method for the sidetrack construction, the Government Complex Gwacheon station on the Gwacheon line of subway line 4 was selected as a virtual research station. Subsequently, four construction plans including tunnel cross-sectional plan for each section were reviewed and constructability and economic feasibility were compared. Finally, the stability assessment was conducted for the selected construction plan which was considered to be relatively unstable by 3-D full numerical analysis considering the sidetrack construction process.
Keywords
Tunnel enlargement; Sidetrack construction; Subway tunnel in operation; Numerical analysis; Stability assessment;
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