Response of tunnels due to blast loading

摘要

The aim of this study is to investigate the response of metro tunnel systems subjected to internalrnblast loading using Explicit Finite Element analysis. Usually, these metro systems consist of two tunnels runningrnparallel to each other. The recent terror strikes exposed the vulnerability of tunnels to explosion. In this study, arntypical metro system with two tunnels of 5m diameter running parallel to each other is considered. The tunnelsrnare embedded in clayey stratum with a burial depth of 9m below the ground surface. The tunnel-soil interactionrnwas also considered in this numerical model. The effect of parameters like explosive quantity and tunnel spacingrnon the response of tunnels was investigated. The explosion tunnel yields for the explosive quantity greater thanrn50 kg of TNT. The influence of blast wave on the adjacent tunnel is less for the spacing greater than 2.2 timesrnthe internal diameter of the tunnel.