Abstract
Effect of Explosion on underground structures where drilled on the stony materials can be affected by explosive strength and rock mass properties of tunnel. In this paper, it has been studied on effect of explosion of 10 tons TNT on the round tunnel (diameter: 10 m) in 25 m depth in the mass rocks (RMR > 90) to estimate stability of tunnel to construct underground structure. Regarding to the studied stones, geo-mechanical indices of rock mass have been found to use as strength criteria in UDEC. In the next step, tunnel in real dimensions and founded indices is modeled with UDEC and analyzed stably. Explosion wave indices are found by UFC Instruction and other experimental relations to administer force from explosion wave on the model. Finally, on the base of FISH, indices of explosion wave are administrated in UDEC and tunnel is analyzed dynamically. According to modeling in depth of 25 m, amount of displacement of drilled tunnel in mass rocks (RMR < 90) is very lower than standard criterion and the tunnel is very stable. Development of plastic zone, vertical and horizontal displacement of rock mass around the tunnel, speed variations and stress from explosion wave are modeled and recorded as the graphs and figures.
Highlights
Passive Defense is an important case in army
One of the most important principles of Passive Defense is to construct safe structures. Some places such as unity tunnels, underground hospitals and mines can be used as the safe structures for Passive Defense
It is necessary to study on explosion and its effects on underground structures and stability of these places from explosive loads
Summary
Passive Defense is an important case in army. Passive defense is a civil defense and refers to a series of. The most important aims of this paper include: study on the important factors in seismic loading effect on stability of underground structures, effect of depth on the rocks with discontinuity system and analyze tunnel stability and amount of wave damping. Stability of these structures against explosive loads from bombs and rockets should be studied before using them as the passive defense structures. Methods based on engineering models are simple with some information They are ideal to evaluate and study on results from explosion loads.
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