沉箱码头在空中和水下爆炸作用下的累积毁伤效应研究

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摘要为了揭示沉箱码头在空中接触爆炸和水下近距离爆炸荷载作用下的累积毁伤效应，对沉箱码头模型开展多类型单次组合爆炸试验，并建立有限元模型对沉箱码头的毁伤过程进行数值模拟，分析了空中、水下单次组合爆炸作用下沉箱码头的毁伤发展和破坏机理。结果表明：空中爆炸和水下爆炸下，沉箱码头呈现出不同的破坏模式，空中接触爆炸下沉箱码头仅上部面板局部破坏，面板爆心位置形成局部破口，而水下近距离爆炸下沉箱和面板均发生明显破坏，沉箱迎爆面中下区域混凝土保护层破碎，面板与管沟连接处形成横向通长裂缝。在空中和水下单次组合爆炸荷载下，沉箱码头上部结构的破坏现象和毁伤程度存在叠加效应，码头面板的二次毁伤在已毁伤形态的基础上发展形成，二次毁伤现象与单次爆炸下的毁伤现象具有一定相似性和累积效应。空中和水下单次组合爆炸作用下，码头面板和管沟连接区域由于应力集中为码头的薄弱部位，沉箱封仓板由于上下填砂的缓冲作用毁伤效应较轻微。

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	刘靖晗1
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	唐廷1
	韦灼彬1
	李凌锋1
	董琪3

关键词 ：水下爆炸, 空中接触爆炸, 单次组合爆炸, 沉箱码头, 累积毁伤效应, 毁伤机理

Abstract：In order to study the cumulative damage effect of caisson wharf induced by air contact explosion and close proximity underwater explosion, the caisson wharf model tests and finite element models were established to analyze the damage process and mechanism of the caisson wharf subjected to combined air and underwater explosion. The results show that the caisson wharf has different failure modes subjected to air and underwater explosion. Under air contact explosion, only the upper structure of caisson wharf is seriously damaged, where a blast hole is observed locally on. Under close-in underwater explosion, both the caisson and the upper structure are obviously damaged. The concrete cover in blast side of caisson is broken. There are transverse cracks at the connection between panel and pipe trench. The damage phenomenon and damage degree of the wharf is disturbed by the superimposition of air and underwater explosions. The secondary damage of wharf forms on the first damage, and is similar with that under single blast. The connection of panel and is weak area due to stress concentration subjected to combined air and underwater explosion. The sealed plate slightly damages due to sand pack buffer mechanism.

Key words： underwater explosion air contact explosion combined explosion caisson wharf cumulative damage effect damage mechanism.

收稿日期: 2023-09-19 出版日期: 2024-06-28

引用本文:

刘靖晗1,2，唐廷1，韦灼彬1，李凌锋1，董琪3. 沉箱码头在空中和水下爆炸作用下的累积毁伤效应研究[J]. 振动与冲击, 2024, 43(12): 298-306.
IU Jinghan1,2, TANG Ting1, WEI Zhuobin1, LI Lingfeng1, DONG Qi1. Cumulative damage effect of the caisson wharf induced by air and underwater explosions. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(12): 298-306.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2024/V43/I12/298

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