Analysis of the Effects of the Presence of Protective Concrete Layer on the Effect of Underground Structures Under the Influence of Explosive Charge

Today, the growth of threats and military weapons and the rise of terrorist attacks has pushed governments into a comprehensive plan of non-operational defense in order to increase their security. Underground structures are one of the most basic ways to protect sensitive and strategic sites against explotions.In this paper, the dynamic interaction of soil and structure is considered, and at this stage, the results of nonlinear dynamic analysis are compared with the results of experimental and analytical relations. Also, while considering the behavior of the buried structure under the influence of the explosion load, the effect of different parameters, such as structural depth and position of the explosion point relative to the structure, and the dynamics characteristics of the complex in the type of structural performance, have been investigated.Then, in the last part, according to the results obtained from the previous section, it was proposed to conclude and provide solutions for protecting and retrofitting the buried structures against the explosion. Finally, it has been observed that the protective concrete layer alone was not effective for the reinforcement of the underground structure due to direct transfer of soil to the soil, and its composition with a porous medium such as a protective concrete box on a structure with porous space is close to 100% Attention was paid to reducing the pressure on the underground structure.