Cumulative damage effect of the caisson wharf induced by air and underwater explosions

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (12) : 298-306.

IU Jinghan1,2, TANG Ting1, WEI Zhuobin1, LI Lingfeng1, DONG Qi1

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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.

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IU Jinghan1,2, TANG Ting1, WEI Zhuobin1, LI Lingfeng1, DONG Qi1. Cumulative damage effect of the caisson wharf induced by air and underwater explosions[J]. Journal of Vibration and Shock, 2024, 43(12): 298-306

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