Science and Technology of Energetic Materials

Vol.69, No.4 (2008)

Research paper

Large-scale explosion experiment of a model underground magazine
Yoshio Nakayama, Dongjoon Kim, Koki Ishikawa,Kunihiko Wakabayashi, Tomoharu Matsumura, and Mitsuaki Iida


We conducted a large-scale explosion experiment to assess blast wave characteristics of a model underground magazine. The magazine tunnel and storage chamber were modeled by a cylindrical steel pipe with one end closed by a reinforced panel. The static overpressures of the blast were measured by piezo-electric pressure sensors set up in three locations at four azimuth angles. TNT charges of 1.2 kg, 6 kg and 30 kg in mass were ignited by a pentolite booster and EBW detonators. Free field explosion of TNT charges weighing 1 kg and 30 kg were conducted to obtain standard blast data. It was found that the peak overpressures decreased with the azimuth angle at the same scaled distance, and the peak overpressures at 60° were higher than that of the free field blast data. The directionality of blast waves decreased at a far distance, but appreciable directionality remained at a far distance. The results of the present study agreed well with our previous studies (1 kg and 0.6 g TNT). The results clearly demonstrated the applicability of the scaling law on the propagation of blast waves around a model underground magazine.

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Underground magazine, Blast wave, Large-scale, Safety distance.  

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