Damage modes of shallow-buried RC oil depots subjected to the coupling of shock waves and oil-gas explosions
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摘要: 为了研究激波与油气爆炸耦合作用下浅埋式混凝土结构油库的破坏损伤模式,设计制作了浅埋式钢筋混凝土结构油库缩比模型,研究了油库结构、油气类型、含量及爆源位置对混凝土油库破坏损伤模式的影响机制。研究表明:爆炸激波作用于油库顶盖引起迎爆面冲切贯穿破坏和背爆面剥离损伤,且50%柴油含量时顶盖的破坏程度大于100%柴油含量;100%柴油加装顶盖时,冲击波超压上升阶段会出现两个峰值,50%柴油加装顶盖情况下由于内部空腔的界面反射作用,相比满油情况,超压上升阶段出现三个峰值,并且冲击波正压持时明显增加;库体底部起爆时,油库顶盖和整体均产生严重破坏,冲击波在角隅处反射叠加,会导致油库主体角隅处出现明显的剪切开裂;相比于50%柴油,50%汽油爆炸产生的火球范围更大,燃烧时间更长,但油库主体结构并不会产生破坏。
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关键词:
Abstract: Scaled models of shallow-buried RC oil depots were designed by changing depots structure, the type and volume of oil, and explosion source locations to investigate the damage modes and mechanisms of shallow-buried RC oil depots subjected to the coupling of shock waves and oil-gas explosions. The research indicates that the shock wave loading on the oil depot cover causes punching-perforation failure on the blast-facing side and spalling failure on the blast-opposite side. The damage degree of the oil depot cover is greater when the depot contains 50% diesel. Two peaks appear in the overpressure rise stage of the shock wave when the oil depot contains 100% diesel while due to multiple interface reflection in the internal cavity, three peaks appear with the increase of the positive pressure duration of the shock wave when the depot contains 50% diesel. The explosion source located at the bottom of the oil depot causes severe damage to both the cover and the main depot structure. The reflection and superposition of shock waves at the corners lead to significant shear cracking at the edges of the main depot structure. Compared to the explosion of 50% diesel, the explosion of 50% gasoline produces a larger fireball with a longer burning duration, which does not cause damage to the main structure of the oil depot.-
Key words:
- Shallow-buried oil depot /
- RC structure /
- Damage mode /
- Shock wave
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