The Influence of Explosion on the Underground Structures in Watery Media

Nowadays, underground structures are increasing day by day due to the population increase, technology development, increasing of military threat and economic saving. The impact rate of underground spaces against explosive loads caused by enemy invasion depends directly on the success and effectiveness of passive defense. On the other hand, stability of the underground spaces is very crucial in various lithological conditions. Due to the increased need for the implementation of these structures, many of these projects may be carried out in unfavorable geological conditions. Therefore, it is necessary to analyze the stability of these spaces for different lithology conditions. In the present study, by means of numerical methods of discrete element, a code has been developed by UDEC software. In the numerical developed code, the influence of water level on the tunnel final support has been investigated. To investigate the effect of water level on the tunnel stability, the pressure of 10 tons of explosives has been exponentially applied to the top of the tunnel. Research indicates that as the water level rises, the damage caused by the explosion increases to the tunnel support.