The Final Surface Imperfections that Apply to the Tunnel Lining Loads Due to Explosion

The entrance of defensive underground structures is vulnerable to blast loading. Deliberate use of prominence in the final lining of the tunnel, one of the ways of dealing with the effects of the blast wave and reduce the vulnerability to degradation. In this study, the software (AUTODYN) the explosions in the line with the distance from the mouth of the tunnel simulated and then the effects of deliberate prominence at the end of the tunnel cover Performed directly.The amount of airflow (overpressure) discussed and finally considering the size prominence of the tunnel and reducing the amount of pressure are expressed. The results show that using prominence can Reduce overpressure inside the tunnel For acceptable.