考虑结构响应及轴线形状的防浪堤抗波浪冲击数值模拟研究

SIMULATION OF WAVE IMPACT BREAKWATER CONSIDERING STRUCTURAL RESPONSE AND SHAPE OF BREAKWATER AXIS

采用多物质ALE(Arbitrary Lagrangian-Eulerian)方法对核电站防浪堤受波浪冲击过程中挡浪墙表面波压力和结构响应规律进行研究。建立与物理模型1∶1的三维直型防浪堤-波浪耦合模型,通过与波浪理论公式和物理模型试验结果对比,验证该文采用的数值造波和耦合冲击方法的可行性。在此基础上建立与实际模型1∶1的三维直、弧型防浪堤-波浪耦合模型,分析了防浪堤结构刚度、断面尺寸以及防浪堤轴线形状对波浪冲击过程中波压力和结构响应的影响。结果表明:防浪堤前、后表面最大波压力分别出现在静水面位置和后墙底部;前墙和堤顶宽度对后墙具有保护作用;结构响应增强前墙波压力,但对后墙波压力有减弱作用;防浪堤轴线方向突变处波压力与结构应力较大。

The wave pressure and the structural response under wave impact were studied using the multi-material ALE(Arbitrary Lagrangian-Eulerian) method. Firstly, a breakwater-wave coupling model based on the physical model was constructed. Meanwhile, the model and approaches were validated by comparison with wave theory and experimental data. Secondly, both straight and curved breakwater-wave coupling models were constructed. The influences of the structure response, the section size and the shape of breakwater axis on the wave impact were analyzed. The results showed that the maximum wave pressure on the front and rear seawall generally appear at the static water level and the bottom of rear wall, respectively. The front wall and breakwater width have a protective effect on the rear wall. Because of the structural response effect, the pressures on the front seawall are increased while the pressures at the rear seawall are decreased. Both the wave pressure and structural stress show peaks in the curved segment of the overall model.