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http://dx.doi.org/10.9711/KTAJ.2021.23.5.325

Case study on design and construction for cross-connection tunnel using large steel pipe thrust method in soil twin shield tunnels underneath airport  

Ahn, Chang-Yoon (Dept. of Civil and Environmental Engineering, Hanyang University, Construction Division, Hyundai Development Company)
Park, Duhee (Dept. of Civil and Environmental Engineering, Hanyang University)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.23, no.5, 2021 , pp. 325-337 More about this Journal
Abstract
On the road and rail tunnels, the evacuation pathway and facilities such as smoke-control and fire suppression system are essential in tunnel fire. In the long twin tunnels, the cross-connection tunnel is usually designed to evacuate from the tunnel where the fire broke out to the other tunnel. In twin shield tunnels, the segment lining has to be demolished to construct the cross-connection tunnel. Considering the modern shield TBM is mostly the closed chamber type, the exposure of underground soil induced by removal of steel segment lining is the most danger construction step in the shield tunnel construction. This case study introduces the excavation method using the thrust of large steel pipe and reviews the measured data after the construction. The large steel pipe thrust method for the cross-connection tunnel can stabilize the excavated face with the two mechanisms. Firstly, the soil in front of excavated face is cylindrically pre-supported by the large steel pipe. Secondly, the excavated face is supported by the plugging effect caused by the soil pressed into the steel pipe. It was reviewed that the large steel pipe thrust method in the cross-connection tunnel is enough to secure the construct ability and stability in soil from the measurement results about the deformation and stress of steel pipe.
Keywords
Cross-connection tunnel; Shield tunnel; Thrust of large steel pipe; Cylindrically pre-support; Plugging effect;
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  • Reference
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