摘要
大坝易遭受水下多弹爆炸打击,水下多弹爆炸打击下大坝的毁伤机制与模式有待深入研究。通过建立水下多弹爆炸打击的混凝土重力坝毁伤效应分析模型,重点讨论了单弹打击、多弹先后打击和多弹同步打击下大坝的动态响应特性和毁伤破坏模式,探讨了水下多弹打击对混凝土重力坝累计毁伤效应的影响,揭示了水下多弹爆炸打击下混凝土重力坝的毁伤机制和空间分布特征;同时,提出以开裂深度比作为重力坝水下爆炸毁伤判定指标,建议了混凝土重力坝爆炸毁伤破坏等级,定量评估了水下单弹和多弹打击下混凝土重力坝的毁伤效应。结果表明:单弹打击下大坝主要为轻微毁伤,而多弹打击下大坝发生严重毁伤,且水下多弹先后爆炸打击下毁伤破坏最严重。
A concrete gravity dam is vulnerable if attacked by underwater multi-bomb explosion,and its damage mechanism and mode under underwater multi-bomb explosion needs to be further studied.Here,by establishing the damage effect analysis model of a concrete gravity dam under underwater multi-bomb explosion,its dynamic response characteristics and damage mode under single bomb attack,multi-bomb successive attack and multi-bomb synchronous attack were studied,respectively.Effects of underwater multi-bomb attack on cumulative damage effect of concrete gravity dam were explored to reveal damage mechanism and spatial distribution characteristics of concrete gravity dam under underwater multi-bomb explosion.Meanwhile,the cracking depth ratio was proposed as the judgment index of underwater explosion damage of gravity dam,explosion damage grades of concrete gravity dam were suggested,and damage effects of concrete gravity dam under underwater single bomb and multi-bomb attacks were quantitatively evaluated.The results showed that a concrete gravity dam mainly is damaged slightly under single bomb attack,while it is seriously damaged under multi-bomb attack;its damage is the most serious under underwater multi-bomb successive explosion attack.
作者
韩华烨
王高辉
卢文波
陈叶青
吕林梅
严鹏
HAN Huaye;WANG Gaohui;LU Wenbo;CHEN Yeqing;Lü Linmei;YAN Peng(State Key Lab of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China;Institute of Defense Engineering,Academy of Military Sciences,People’s Liberation Army,Beijing 100850,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2022年第13期172-179,共8页
Journal of Vibration and Shock
基金
国家自然科学基金(52179140,51939008)
湖北省自然科学基金杰出青年项目(2021CFA093)
武汉市应用基础前沿项目(2020020601012282)。
关键词
混凝土重力坝
水下多弹爆炸
累积毁伤效应
毁伤机制
毁伤指标
concrete gravity dam
underwater multi-bomb explosion
cumulative damage effect
damage mechanism
damage index
