Abstract
Mitigation of blast wave, caused by explosion of explosives, from a straight tube using water in a bag (water bag) was evaluated. The length of the tube was 330 mm and the cross-section area was 30 x 30 mm2. One end of the tube was closed. The water bag was placed on the floor or closed end wall of the tube near the explosive. The thickness of water was 3 mm. A specially designed small detonator, which contains lead azide of 100 mg, was ignited near the closed end wall of the tube. The blast pressure outside the tube was measured and examined. The blast wave was remarkably mitigated by the water bag. Equivalent ratio analysis revealed that the glass beads absorbed 33%-45% of explosion energy.
Highlights
Magazine used for storing explosives is generally installed in mountainous areas away from urban areas
Subsurface magazines were proposed to reduce the effects of blast waves, fragments, and ground shock and to maintain a safety distance when storing explosives underground
In a series of the experiments, the authors found that small amount of water on the floor of its storage chamber mitigated the blast pressure remarkably [5]
Summary
Magazine used for storing explosives is generally installed in mountainous areas away from urban areas. In a series of the experiments, the authors found that small amount of water on the floor of its storage chamber mitigated the blast pressure remarkably [5]. Our previous study [6] concluded that the high-speed camera images showed that the water in the chamber did not move apparently after the explosion, the energy conversion from the blast wave to kinetic energy of water was not main origin of the mitigation. The numerical simulations [8, 9] of this system concluded that internal energy transfer from the blast wave to the water caused the mitigation This result can apply to reduce the damage by explosion in closed places, such as subsurface magazines, underground magazines and tunnels.
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