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  Stability analysis of damaged concrete jack lining in an urban cable tunnel

  In order to minimize environmental impact, semi-shield tunnelling method has been widely applied to construct tunnels for water and sewage, power cable and gas pipe in urban area. In this study, a power cable tunnel was excavated by a semi-shield machine in Suwon, Korea in 2013. Total length of the tunnel is 453 m and the diameter is 2.4 m. During jacking process, unexpected medium rock condition was met and the tunnel alignment deviated from the planned one. Fig. 1 showed the picture of the original planned alignment and deviated one after the change. Due to the change, among the total length, 293 m interval was jacked using concrete linings with each length of 2.43 m and 160 m interval was finished with segment linings with each length of 1.0 m. Besides, the concrete linings were damaged resulting in cracks and water inflow. The damage was temporarily remediated by back grouting and filling. However, to secure the long-term stability of the tunnel, safety inspection including appearance check was carried out to determine the safety grades of each lining. After the appearance check, numerical simulation was also carried out to check out the long-term stability of the linings. Additionally, undercoring test was performed to verify the numerical simulation.

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