Study on anti-explosion protection of composite steel plate lining structure

Abstract

A subway, as a transportation facility for huge traffic, is prone to be the target of terrorist bombings while facilitating people in traffic significantly. Accordingly, to reduce the impact of security risk, this paper proposes a new composite steel plate lining structure to ensure subway anti-explosion protection in light of the advantages of high shear strength and tension resistance of a composite steel plate. In addition, by referring to the case of Nanjing (in China) subway project, this study established a numerical model for the anti-explosion protection impact of a composite steel plate lining structure in a subway tunnel through a dynamic analysis software LS-Dyna, and analysed the dynamic response of the lining structure of the numerical model with or without a composite steel plate under a 10 kg trinitrotoluene (TNT) and a 30 kg TNT of explosive equivalents. According to the results, the composite steel lining structure is able to effectively absorb shock waves in case of subway explosion, and the acceleration and velocity of the tunnel lining structure are reduced significantly, which can effectively prevent an explosion under a low explosive equivalent.