库前水位对混凝土重力坝抗爆安全性能的影响  

Influence of water level on the antiknock safety performance of concrete gravity dam

作　　者：李麒[1] 王高辉[1] 卢文波[1] 陈明[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《振动与冲击》2016年第14期19-26,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(51125037);中央高校基本科研业务费专项资金项目(2042015KF0001)

摘　　要：现代战争有征兆可察,通过预警放水不仅可以有效提高大坝的抗爆安全性能,同时能够减少大坝失事风险损失。基于显示动力分析平台,考虑爆炸高加载率下的混凝土应变率效应,建立水下爆炸条件下炸药-气体-库水-坝基-坝体全耦合动力分析模型,对比分析了正常蓄水位及死水位条件下混凝土重力坝水下爆炸毁伤破坏特征及抗爆安全性能;同时针对战时预警放水条件,分析不同库前水位下混凝土重力坝的动态响应特征、破坏发展过程及毁伤空间分布特征,全方位研究了库前水位对大坝抗爆安全性能的影响。结果表明:对于混凝土重力坝,随着库前水位的降低,坝体损伤破坏范围逐渐减小;当库前水位降低到大坝下游折坡以下时,大坝抗爆安全性能得到显著的提高。Through the early warning water discharge,not only the antiknock safety performance of dams can be effectively improved,but also the loss induced by dams failure can be reduced. The strain rate effect under blast loading was taken into consideration in the establishment of a fully coupled analysis model for gravity dams by using a dynamic analysis platform. The damage characteristics and antiknock safety performance of concrete gravity dams subjected to underwater explosion shock loading at normal water level and dead water level were analyzed contrastively. The dynamic response characteristics,the damage development process and the characteristics of spatial distribution of concrete gravity dams damage under different water level were analyzed in the early warning discharge condition. The results indicate that,for concrete gravity dam,with the reduction of water level in front of the dam,the damage range of dam decreases gradually,and that the antiknock safety performance of dam is improved remarkably when the water level in front of the dam decreases to the level of downstream slope.

关 键 词：混凝土重力坝 库前水位 抗爆安全性能 全耦合模型 水下爆炸 损伤演化 

分 类 号：TV312[水利工程—水工结构工程]