考虑初始应力的混凝土重力坝水下爆炸毁伤特性研究

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (11) : 133-140.

论文

王高辉1，高政1，卢文波1，陈叶青2，吕林梅2

作者信息 +

Damage characteristics of underwater explosion of concrete gravity dam considering initial stress

WANG Gaohui1, GAO Zheng1, LU Wenbo1, CHEN Yeqing2, L Linmei2

Author information +

文章历史 +

摘要

水下爆炸冲击荷载由于持续时间短、峰值大，对大坝结构的冲击毁伤破坏往往在短时间内完成，故已有的大坝抗爆防护研究中均忽略了大坝初始应力的影响。本文采用显隐转换技术，实现了大坝初始应力状态从隐式静力分析到显式动力分析的平稳过渡；通过建立考虑初始应力的混凝土重力坝水下接触和非接触爆炸全耦合模型，分析了不同初始应力状态下大坝动态响应特性，分别探讨了重力和静水压力等初始应力对混凝土重力坝水下爆炸毁伤特性的影响，给出了考虑初始应力状态后的大坝水下接触和非接触爆炸毁伤破坏模式。研究结果表明：初始应力会加重坝身冲切破坏，而减轻上游坝面爆炸成坑破坏和坝踵拉伸破坏。

Abstract

The underwater explosion shock loading has a short duration and large peak value, and the damage to the dam is often completed in a short time. Therefore, the initial stress of dams has always been ignored in the existing research on dam antiknock protection. In this paper, the explicit-to-implicit conversion is used to realize the smooth transition of initial stress of dams from implicit static analysis to explicit dynamic analysis. The initial stress is taken into consideration in the establishment of concrete gravity dam fully coupled analysis model. The dynamic response characteristics of dams under different initial stress states were analyzed, the effects of gravity and hydrostatic pressure on damage characteristics of concrete gravity dams subjected to underwater explosion were discussed, the failure modes of dams subjected to underwater contact and non-contact explosion were listed. The results show that the initial stress will aggravate the punching damage, while reduce the crushing damage and tension damage.

导出引用

王高辉1，高政1，卢文波1，陈叶青2，吕林梅2. 考虑初始应力的混凝土重力坝水下爆炸毁伤特性研究[J]. 振动与冲击, 2022, 41(11): 133-140

WANG Gaohui1, GAO Zheng1, LU Wenbo1, CHEN Yeqing2, L Linmei2. Damage characteristics of underwater explosion of concrete gravity dam considering initial stress[J]. Journal of Vibration and Shock, 2022, 41(11): 133-140

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