水中爆炸气泡脉动周期的试验研究

摘要

The phenomena of secondary vibration of structures induced b y underwat er explosion are observed in the experiments. According to the existing theories on underwater explosion and based on the analysis of experimental results, the laws of foundation and structure vibrations are summarized. It's indicated that the secondary vibration phenomena are related to the bubble impulsion caused by underwater explosion. The law of bubble impulsion from the explosion nestled aga inst a wall and the calculated period of bubble impulsion are specially given in this paper. Since the amplitude of secondary structural vibration induced by bu bble impulsion is approximate to the amplitude of primary vibration, a great att ention should be paid to the harm of secondary vibration to structures.%通过工程试验研究，观测到水下爆炸引起的地基及水中结构物的二次地震波现象。借助已有的水下爆炸理论，分析试验结果，总结了地基及结构振动的规律，指出二次振动现象与水中爆炸产生的气泡脉动有关。试验特别给出了紧贴壁面爆炸时气泡脉动的规律及其脉动周期的计算结果。气泡脉动诱发的结构物二次振动的幅值与第一次振动的幅值相近，其危害性应引起重视。