Resilience Assessment Framework for Tunnels Exposed to Earthquake Loading

Abstract

Abstract The present paper proposes an integrated framework for the seismic resilience assessment of tunnels by using the appropriate fragility, restoration and functionality models, which consider both geotechnical and structural effects. Typical circular tunnel in Shanghai city of China is examined in this study, and the corresponding numerical model is built in ABAQUS. A couple of earthquakes are chosen to conduct non-linear dynamic analysis, so as to get the tunnel responses under increasing levels of ground shaking intensity. Fragility curves are constructed accounting for the main sources of uncertainties. Moreover, based on the proposed fragility curves and the existing empirical tunnel restoration functions, the development of resilience index (Re) with the peak ground acceleration (PGA) at the free-field ground surface for circular tunnel is evaluated and quantified. The results indicate that this type of tunnel is good of seismic resilience. The proposed framework is expected to facilitate city managers to support adaptation with preventive or retrofitting measures against seismic hazards, toward more resilient metro systems.KeywordsSeismic resilienceCircular tunnelFragility curveNumerical modelling