Reduction Methods of Blast Effects on Entrances of Underground Safe Spaces

In order to decrease the damages of substructures and important operational structures againstweapons of an enemy, they will be transferred into appropriate depth of the ground and the onlycommunication way of these spaces with external environment are their ingress and egress and incase of damage, communication with external environment will be disconnected and people andequipments inside the safe space will be captured. Therefore these inputs should be designed insuch a way which can reduce explosion waves and prevent these waves from entering the underground safe spaces. The purpose of this paper is to explain weak and strong points of differentmethods of decreasing explosion waves in entrance safe spaces. In this research, different types ofdecreasing explosion effects on entrance of underground safe spaces are reviewed through applyingdescriptive methods and library research and by content analysis, weak and strong points aregained. Finally, it is concluded that applying one method may not be enough and we can utilizesome other methods.