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A blast wall is a barrier designed to protect vulnerable buildings or other structures and the people inside them from the effects of a nearby explosion, whether caused by industrial accident, military action or terrorism. ==Effectiveness== Research by Cranfield University Defence Academy, building on earlier work, has shown that blast walls have the following properties: * A non-deforming upright wall will significantly reduce the peak blast overpressure and impulse in an area between 4 and 6 wall heights behind it * Similar protection occurs but at greater distances behind the wall, but to a diminishing extent * Blast walls perform best if the explosion is relatively close to the front of the wall〔 (p. 5)〕 * "Canopied" walls (with a top section overhanging the front face) show some improved blast protection over plane walls * A 90-degree canopy is more effective than a 45-degree one〔Smith p. 7〕 * Walls containing sand or water work well, and cause little damage if they fail * A wall has to stay intact long enough to "interact" with the blast in order to have any effect〔Smith p. 11〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「blast wall」の詳細全文を読む スポンサード リンク
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