Investigating the Load Caused by Explosion Phenomenon and Blast Wave Propagation

The explosion inside the tunnel caused a blast wave that is transmitted through the longitudinal tunnel. Due to the environmental effects of the tunnel and the reflection of the enclosed tunnel structure, the propagation of the blast wave inside the tunnel can be detected in the air. During the explosion inside the tunnel, the maximum peak pressure is higher than the explosion occurred in the air. The duration of the blast wave becomes longer. With the help of finite element simulation of LS-DYNA software, three-dimensional nonlinear dynamic simulation analysis was performed for tunnel blast test. LS-DYNA is a comprehensive analysis program designed for nonlinear dynamics and large relative deformation problems. Compared to the experimental results, the simulation results have made it possible to obtain the material parameters of the numerical simulation model. By using the model and material parameters, many results are adopted according to the calculation of the desired model under TNT dynamite explosion. Dimensional analysis method was used for simulation results. Since the overpressure of the blast wave is the dominant factor in tunnel reactions, a formula for the overpressure of the blast wave at a certain distance from the center of the sudden explosion inside the tunnel has been derived using the theory of dimensional analysis. By comparing the results calculated by the formula with the experimental results obtained before, the desired formula is used in some cases. This research can help us estimate the impact of the explosion inside the tunnel on the structure.

کلیدواژه ها:

Explosion ، Blast Wave ، Investigation ، Analysis