混凝土重力坝爆炸荷载数值分析及抗爆性能研究

利用LS-DYNA非线性有限元程序，基于Eulerian和Lagrangian耦合的方法，研究了RHT本构模型模拟的混凝土板在爆炸荷载下的动力反应，并且将数值结果与现场实验结果进行比较，由此说明了RHT本构模型模拟爆炸荷载下混凝土动力反应的有效性。研究了2 t TNT炸药在距离坝体上游面10 m不同起爆深度的情况下，有泡沫混凝土保护层和无泡沫混凝土保护层的坝体动力响应及其损伤状况。计算结果表明，无泡沫混凝土保护层时，坝体上游面主要损伤区域位置总是随起爆深度的增加向坝体底部移动；当上游表面有泡沫混凝土保护层时，坝体上游表面的损伤明显变小，下游面的损伤较无保护层情况也明显减小。表明泡沫混凝土能够有效减小混凝土大坝在爆炸荷载下的损伤，在提高混凝土大坝的抗爆性能方面起到很好的保护作用。

Numerical analysis and anti-knock property study of concrete dam subjected to underwater explosion

In this paper,the RHT concrete constitutive model is used to model the dynamic response of a concrete slab under blast loadings,based on Eulerian and Lagrangian coupling method,and LS-DYNA nonlinear finite element program.The numerical results are used to compare with the field experimental results,and the comparison shows the effectiveness of the RHT model.Based on the RHT model,the dynamic response and damage condition of the dam with and without foam concrete cover under 2 t TNT explosive blast loadings are studied.The detonation point is 10 m away from the upstream of the dam and in different detonation depth.When there is no foam concrete protective layer,the location of the main damage area on the upstream surface of the dam always moves to the bottom of the dam with the increase of the initiation depth.When there is a foam concrete protective layer on the dam,the damage area of the upstream surface is significantly smaller,and the damage area of the downstream surface is also smaller than that of no protective layer.The results show that the foam concrete can effectively reduce the damage of concrete dam under explosive loads,and have a good protective effect on the anti-explosive properties of concrete dams.