库前水位对混凝土重力坝抗爆安全性能的影响

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (14) : 19-26.

论文

李麒,王高辉，卢文波，陈明

作者信息 +

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

LI Qi，WANG Gao-hui?，LU Wen-bo，CHEN Ming

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文章历史 +

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。

Abstract

There are signs of modern wars, through the early warning discharge not only can effectively improve the antiknock safety performance of dams, but also can reduce the loss of dams failure risk. The strain rate effect under blast load is taken into consideration in the establishment of gravity dam fully coupled analysis model based on dynamic analysis platform. The damage characteristics and antiknock safety performance of concrete gravity dams subjected to underwater explosion shock loading in normal water level and dead water level were analyzed contrastively. The dynamic response characteristics, damage development process and the characteristics of spatial distribution of concrete gravity dams under different water level were analyzed for the early warning discharge condition at the same time. The results indicate that, for concrete gravity dam, with the reduction of water level before dam, damage range of dam decrease gradually, and that the antiknock safety performance of dam improved remarkably when the water level before dam below the change in downstream slope.

导出引用

李麒,王高辉，卢文波，陈明. 库前水位对混凝土重力坝抗爆安全性能的影响[J]. 振动与冲击, 2016, 35(14): 19-26

LI Qi，WANG Gao-hui?，LU Wen-bo，CHEN Ming. Influence of water level on the antiknock safety performance of concrete gravity dam[J]. Journal of Vibration and Shock, 2016, 35(14): 19-26

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