EFFECTS OF COVERED SOIL ON BLAST WAVE PROPERTIES DUE TO INNER EXPLOSION OF EARTH COVERED EXPLOSIVE MAGAZINE

Abstract

Now, in Japan, the security distance in the explosive magazine is simply regulated to set by the rule of K-value and the amount of storage explosives. This regulation is on a basis of explosion in a free air. However, the peak over pressure of blast wave induced by the inner explosion of earth covered explosive magazine may be reducible. In this study, to find the effects of covered soil on the blast wave properties due to the inner explosion of earth covered explosive magazine, small scaled explosive tests were executed. In tests, the 1/20 scaled model magazines were exploded under the conditions of different amount of C4 explosive (10-50 g) and thickness of covered soil (0-15 cm). From test results, it is found that the peak over pressure is obviously reduced by the increase of covered soil thickness. Thus the curtailment of security distance is presented to receive or parallel with the present domicile situation.