Analysis of the Surface Explosion Effects on Underground Tunnels

Nowadays air missile attacks on buried structures are one of the most important issues in passive defense. In this paper, the numerical simulation method is used to analyze and simulate the ground explosion on a buried tunnel. All the simulations and modeling presented are using LS-DYNA hydro code. Generally, the simulation of explosions are divided into a four-step process; blast hole formation, propagation of waves in the soil, soil-structure interaction and dynamic response of buried structure. In order to evaluate the dynamic response of the structure, parametric analysis is used. This analysis includes the effect of the explosive charge weight and the buried depth of the structure, the progression of pressure wave in the soil, von-misses effective stress and the acceleration on the tunnel wall. In the end, the numerical results are compared to the US Army Corps of Engineers Manual (TM5-855-1).