ANALYSIS OF NUMERICAL MODELING OF BLAST WAVE EFFECTS ON UNDERGROUND CIVIL PROTECTION STRUCTURES IN ANSYS AUTODYN

Abstract

The article discusses the method of ensuring the protection of civil defense underground structures from explosive loads, which is one of the key tasks in modern engineering. The shock wave created during the detonation of explosives can generate significant stresses or even cause the destruction of underground structures, especially if their strength is insufficient or their location is unfavorable. This emphasizes the need to apply effective protection methods and engineering solutions. One of the most promising methods for minimizing the impact of the shock wave is the use of underground protective screens. Reinforced concrete screens, in particular, are highly effective in partially dissipating and absorbing the energy of the explosion, thereby reducing the level of loading on the underground structures. The implementation of such screens can significantly enhance the safety of underground facilities used for protecting the population, military, or strategic infrastructure objects. This study presents a numerical simulation of the detonation of a TNT charge above an underground shelter using modern computer simulation tools. Two model variants were considered: the first involved the use of a protective reinforced concrete screen between the explosion’s epicenter and the structure, while the second variant did not include a screen. For the calculations and analysis of the results, ANSYS AUTODYN software was used, which enables the mathematical reproduction of the interaction of the shock wave with various environments, including soil and concrete barriers. The results of the numerical analysis showed that in the model with the protective screen, the maximum pressure on the underground structure was 5,4% lower than in the case without the screen. This demonstrates the potential effectiveness of reinforced concrete protective structures in reducing the impact of explosive loads and their feasibility in the design of civil defense structures. The obtained results can serve as the basis for further research in this field, field testing, as well as the development and optimization of structural solutions that take into account the initial parameters, functional purpose, and dimensions of underground facilities. Promising areas for future research include the improvement of protective screen designs, analysis of their effectiveness in different soil types and under varying explosive impact conditions, which will help create even more effective protection systems.