Assessment of technical - engineering and defensive requirements for reuses of underground salt mines of Sardareh Region as a passive defense structures

Summary : In this paper, the conversion ability of underground salt mines into a strategic underground space has been studied. As a case study, underground salt mines near the city of Garmsar have been considered. For this purpose, combinations of empirical and numerical methods are used.
Creation of safe Structures is one of the most important principles of passive defense. Excavated underground facilities in order to extract mineral deposit are the suitable options for this purpose. When underground structures have a strategic importance, safety of such structures is very important. In such conditions, static and dynamic analysis of structures must be considered. In this case, In terms of passive defense, the stability analysis of structures under explosion loads initiated by Earth Penetration Warhead has a particular importance.
Methodology and Approaches : In this paper, at first, through studies of documentaries, field observations and based on technical and geometrical criterion, a feasibility study has been performed on the application of underground salt mines near the city of Garmsar as a passive defense structures. Then, to consider a defensive criterion, dynamical analysis of selected underground salt mine under the penetration depth of GBU-28 warhead and its explosion loads has been studied by using numerical methods. For this purpose, a combination of empirical method to calculate the explosive load and numerical method to simulate the explosive process are used. For numerical modeling, FLAC software is used.
Results and Accordingly feasibility studies, the Kouh-Dasht-Kohan mine has been chosen as the best option as a passive defense structure. The obtained results of the numerical modeling have shown that the sections of the underground space of Kouh-Dasht-Kohan mine located at depths more than 60 meters, under loads resulting from the explosion of the warhead is stable. In general, as a result, the mine has an ability to convert a strategic underground space.