An analytical model to evaluate the resilience of shield tunnel linings considering multistage disturbances and recoveries

The assessment of shield tunnel linings is a key activity for ensuring the operational safety of trains. This paper proposed an analytical model for evaluating the resilience of shield tunnel linings considering multistage disturbances and recoveries on the basis of resilience theory. The resilience metric of the tunnel linings was calculated according to a multistage resilience analysis model established by this paper. The diameter convergence and settlement of the tunnel were chosen as the performance indicators based on the different responses of the tunnel linings under loading and unloading conditions. The classification standard for the resilience of the tunnel linings was suggested according to existing research results. Then, the influences of the performance recovery degree and decision-making time on the tunnel linings resilience were discussed. Finally, the analytical model proposed in this paper was applied to the case of basement excavation beside existing tunnels. The results showed that the resilience metric obtained by different linings performance indicators was obviously different. For excavation beside existing tunnels, only taking diameter convergence as the performance indicator of the tunnel linings caused the calculation results to be high, that is, the linings resilience was overestimated. From the case in this paper, the settlement of the tunnel should be given more attention. In addition, the existence of the evolution stage in the performance degradation curve significantly reduced the resilience of the tunnel linings. The research results in this paper will provide important references for the safety assessment of shield tunnels and the performance recovery of damaged linings.

Automated summary

This paper proposes an analytical model for evaluating the resilience of shield tunnel linings considering multistage disturbances and recoveries. The results show that the choice of performance indicators significantly affects the measurement of resilience, and settlement should be given more attention.