Numerical Study of Zigzag Wall Structures on the Blast Wave in the Tunnel

One of the important issues in passive defense is to create the maximum attenuation of the blast wave. For this purpose, the current study focuses on reducing the shock wave using zigzag structures. The aim of this strategy is reflections and refraction of shock wave. Zigzag structure unlike the barrier approach by using minimal obstruction along the tunnel is performs attenuation. In this research, the amount of attenuation of the shock wave from the center of a tunnel with zigzag wall with 16 different zigzag cases and also one case without zigzag has been investigated. Numerical methods can predict the behavior of materials with appropriate accuracy and away from the limitations of experimental tests. From the numerical simulations, it can be seen that among the various designs of the zigzag structure, the maximum attenuation of the shock wave will be 79/74% at a distance of 19/5 meters from the explosion by a zigzag structure with a height and triangle base equal to1 meter. In this zigzag design, the initial shock wave undergoes reflection and refraction, which alternately reflects from one side to the other. This repetitive shock wave reflection helps to reducing the shock wave with virtually no blockage in the tunnel.