Effect of the Type of Soil on the Design Criteria of Horseshoe Shape Concrete Structures under the Surface Blast

In recent decades, some of the limitations of space and economic, political and military considerations attracted the attention of developed and developing countries with the construction of underground structures for the purpose of construction, mining and military. In this context, many studies took place in order to understand the behavior of underground structures against blast waves. Generally, underground structures are more resistant than structures on the ground to the blast; hence, they show less changes and degradation with explosion. This study aims to schematically modeling the underground structures by using ANSYS software and investigate the effect of soil type and the distance from the explosion site on design criteria including, moment, axial force, shear force and curvature. The results of simulations show that the explosive behavior is vastly different in each soil types ranging from soft to hard. All values of the evaluation criteria decrease with distance from the center of the explosion.