Dynamic performance assessment of shallow buried circular tunnels under explosion hazard

Abstract

In recent years, the escalation in accidental explosions has emerged as a formidable threat to tunnel infrastructures. Therefore, it is of great significance to conduct a dynamic performance analysis of the tunnels, to improve the safety and maintain the functionality of underground transport hubs. To this end, this study proposes a dynamic performance assessment framework to assess the extent of damage of shallow buried circular tunnels under explosion hazards. First, the nonlinear dynamic finite element numerical model of soil-tunnel interaction system under explosion hazard was established and validated. Then, based on the validated numerical model, an explosion intensity (EI) considering both explosion equivalent and relative distance was used to further analyze the dynamic response characteristics under typical explosion conditions. Finally, this study further explored the influence of the integrity and strength of the surrounding soil, concrete strength, lining thickness, rebar strength, and rebar rate on the tunnel dynamic performance. Our results show that the dynamic performance assessment framework proposed for shallow circular tunnels fully integrates the coupling effects of explosion equivalent and distance, and is able to accurately measure the degree of damage sustained by these structures under different EI. This work contributes to designing and managing tunnels and underground transport networks based on dynamic performance, thereby facilitating decision-making and efficient allocation of resources by consultants, operators, and stakeholders.

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