水下爆炸冲击荷载下混凝土重力坝的破坏效应

在相同炸药量下水下爆炸对混凝土重力坝的破坏效应强于空中爆炸,因此需重点关注水下爆炸冲击下的混凝土重力坝的毁伤机理。考虑爆炸作用下混凝土的高应变率效应、冲击波与结构的动态相互作用以及结构的非线性动态响应等复杂问题,基于Lagrangian-Eulerian全耦合方法建立水下爆炸混凝土重力坝耦合模型,对近坝水下爆炸冲击波传播特性进行分析,得到了水下爆炸冲击下混凝土重力坝的毁伤破坏过程及毁伤机理。研究表明,水下爆炸冲击荷载作用下混凝土重力坝的毁伤模式主要有爆炸成坑破坏、气穴冲切破坏、震塌拉伸破坏、冲击波冲切破坏、弯曲破坏和整体拉伸破坏。

Damage effects of concrete gravity dams subjected to underwater explosion

An underwater explosion can cause significantly more damage to the dam than the same amount of explosive in air. Hence,attention should be paid to the damage mechanism of concrete gravity dams subjected to underwater explosion. The strain rate effect of concrete material under blast load, shock wave-structure interaction and structural response are taken into consideration in the establishment of gravity dam fully coupled model based on the combined Lagrangian and Eulerian methods. The shock wave propagation characteristics of underwater explosion near the dam are investigated. The failure process and damage mechanism of concrete gravity dams subjected to underwater explosion are obtained. The results show that the main failure modes of concrete gravity dams subjected to underwater explosion include the crushing damage,cavitation damage,spalling failure,punching failure,bending failure,tension failure.