Due to the increasing threat of terrorism, the potential use of explosive devices, and the necessity to protect vital infrastructure and personnel, bunkers are becoming increasingly required in today's world to protect against blast loads. In this study, a bunker exposed to a surface blast was analysed using finite elements (FE), with soil as the surrounding medium. Using ABAQUS/Explicit, the ConWep programme based on the US Army was used to simulate blast loading. To define the behaviour of soil, concrete, and reinforcement, we used the Mohr Coulombs (M-C) plasticity model, the concrete damage plasticity (CDP) model, and the Johnson–Cook (J–C) plasticity models, respectively. In the FE analysis, three types of bunker shapes were taken into account: cylindrical, cylindrical with a D/4 curvature height, and cylindrical with a D/2 curvature height (D is the diameter of the cylindrical). At the center of the soil surface, up to 3000 kg of TNT explosive were used. The response of the bunker in terms of stress, displacement and tension damage was computed. The result shows that by changing the curvature of bunker liner stress, displacement, and tension damage also change. The cylindrical bunker with D/2 curvature has maximum stress and displacement.