不同爆炸方式下混凝土重力坝的抗爆性能

大坝受袭的可能方式主要有直接命中坝体、库前水下爆炸、库区近空爆炸，研究不同爆炸方式下的大坝抗爆性能对坝工安全防护具有特别重要的意义。本文考虑爆炸冲击荷载作用下混凝土的高应变率效应，构建了重力坝侵彻爆炸、水下爆炸、空中爆炸的全耦合模型，对不同爆炸方式下的大坝动态响应进行了全性能数值仿真，探讨了混凝土重力坝在不同爆炸方式下的可能破坏模式及抗爆性能，为大坝抗爆性能评估和防护设计提供基础。研究表明，水下爆炸冲击荷载作用下大坝的破坏效应较大，水下贴坝面爆炸时大坝破坏最严重；侵彻爆炸和空中爆炸的毁伤效应主要表现为坝体的局部破坏效应，而且侵彻爆炸呈现以爆炸作用为主侵彻作用为辅的破坏特征

ntiknock Performance of Concrete Gravity Dam Subjected to Different Blast Loads

Dam may be mainly subjected to penetration explosion, underwater explosion, air explosion. The different explosions of anti-knock performance of dam construction on the dam's security is of particular importance. Strain rate effect of concrete dam was taken into consideration in the establishment of gravity dam fully coupled model, Numerical simulation method was used to study the dynamic response of the dam subjected to different blast loads. The possible failure mode and antiknock performance of concrete gravity dam was discussed, and this can provide references to the antiknock performance-based assessment and protective design. The study shows that, Damage effects of dam is larger when subjected to underwater blast loading, and the dam is in the most severely damaged when the bomb attachs to dam surface; Penetration explosion and air explosion effects of damage to the dam mainly show local damage effects, and penetration explosion presents as destruction feature of an explosive blast effect, supplemented by a penetration effect.