Accidental explosions in explosive facilities such as explosive magazines cause the ejection of hazardous fragments and debris as well as create airblast overpressure. Subsurface magazines are promising for mitigating these hazards and reducing the quantity-distance (QD) criteria. A subsurface magazine is constructed in the ground to mitigate the explosive hazard, and is equipped with a storage chamber, an access tunnel, and a vertical shaft used as an exit. From the viewpoint of safety assessment, it is important to evaluate the safe distance from hazardous fragments and debris associated with an explosion in a subsurface magazine. In this study, the debris produced by explosions in subsurface magazines was experimentally evaluated. Box-shaped (flat roof) and arch-shaped scale-model magazines were prepared, and scaled internal explosion tests using Composition C4 explosive were conducted at predetermined loading densities. The relationships of debris quantity-distance, mass-distance, and so on were evaluated in order to establish the suitable siting and design of explosive facilities. The results are expected to contribute to the establishment of QD regulations for the debris hazards of subsurface magazines.
火薬庫などの火薬類取扱い施設での爆発事故は爆風圧とともに危険飛散物を発生する。 地下式火薬庫はこのような被害を軽減し，保安距離を縮小することが期待されている。 地下式火薬庫は地中に建設され，貯蔵室，通用路，エレベータシャフトから構成されている。 地下式火薬庫の爆発に伴う危険飛散物の影響評価は安全性評価の観点から重要であり，本研究では地下式火薬庫の爆発により発生する飛散物を実験的に評価した。 ボックス型とアーチ型構造を持つ縮小モデル火薬庫を準備し，所定の薬量容積比でC４爆薬を内部爆発させて実験を行った。 地下式火薬庫の適切な設置や設計基準を確立し，また飛散物に関する保安距離評価に貢献するため，飛散物数量-距離，飛散物量-距離などの関係を評価した。
explosions, fragments and debris, subsurface magazine