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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。
The destructive effect of underwater explosion on concrete gravity dams under the same amount of explosives is stronger than that on air explosions. Therefore, it is necessary to pay more attention to the damage mechanism of concrete gravity dam under the impact of underwater explosions. Considering the high strain rate effect of concrete under explosion, the dynamic interaction between shock wave and structure and the nonlinear dynamic response of the structure, a coupling model of underwater explosive concrete gravity dam is established based on Lagrangian-Eulerian full coupling method. Under the impact of underwater explosion shock damage of concrete gravity dam damage and damage mechanism. The results show that the damage modes of concrete gravity dam under the impact load of underwater explosion mainly include explosion into pit, punching failure for cavitation, tensile failure, shock wave punching failure, bending failure and overall tensile failure.