对海啸漂浮物冲击沿海防浪堤造成的结构安全问题,基于多物质ALE(Arbitrary Lagrangian-Eulerian)方法,利用带阻尼罚函数实现波浪、海啸漂浮物和防浪堤结构三者之间的耦合作用,建立三维数值冲击耦合模型,模拟了孤立波带动漂浮物冲击防浪堤结构的动态响应过程.首先通过物理模型试验验证所用数值方法的可靠性,在此基础上研究了防浪堤挡浪墙抗海上和陆上漂浮物的冲击能力,并且从漂浮物的质量、漂浮物距挡浪墙的距离等参数对冲击规律展开研究.结果表明,带漂浮物的海啸相比海啸波对结构更具破坏力;漂浮物质量和相对于防浪堤的初始位置对防浪堤的冲击响应有较大影响. Based on the multi-material ALE (Arbitrary Lagrangian-Eulerian) method, the coupling effect of waves, tsunami floating objects and breakwater structure using the damping penalty function , A three-dimensional coupled model of numerical shock was established to simulate the dynamic response of isolated wave-driven drift-breakwater structure. First, the reliability of the numerical method was verified by physical model test. Based on this, The research on the impact law against the floating and floating objects on the sea and on the ground, and studies the impact law from the floating mass and the distance between the floating object and the retaining wall. The results show that the tsunami wave with floating objects has more impact on the structure Destructive force; the amount of floating objects and the initial position relative to the breakwater have a greater impact on the impact response of the breakwater.