波浪作用下斜坡上护面块体应力分布的数值模拟

文章基于SPH方法和FEM/DEM方法建立了SPH-FEM/DEM的二维流固耦合数值模型,模拟了在波浪荷载作用下斜坡上的护面块体内部的应力分布。结构物的水动力条件采用SPH方法模拟,结构物边界采用虚粒子模拟,护面块体结构的受力、运动和变形采用FEM/DEM方法模拟。不同块体间的接触力采用基于势函数的罚函数法来计算,采用中心差分的显式方法来求解有限元单元的变形。应用ANSYS软件和数值模型对静水压力作用下的混凝土方块的内部应力分布进行了比较模拟分析,验证了所建立的耦合数学模型。通过数值计算给出了波浪作用下位于斜坡上的护面块体的动水压力和块体内部的应力分布,讨论了块体内不同角点位置处的应力变化特性。

Numerical simulation of stress distribution of mound breakwater armor blocks under wave action

Based on SPH method and FEM/DEM was presented in this paper, and the stress distribution method, a two-dimensional SPH-FEM/DEM couple model of mound breakwater armor blocks under wave action was simulated. The hydrodynamic conditions of the blocks were treated using the SPH method, the solid boundaries were simulated using virtual particles, the interaction forces, motions and deformation of blocks were simulated using the FEM/DEM model. The interaction forces among different blocks were calculated by penalty function method. The deformation of finite element was solved by central difference method. The accuracy of the method was confirmed by comparing the stress of rectangular concrete under hydrostatic pressure with the result of ANSYS at the same condition. According to the numerical model, the impact pressure and stress of armor blocks under wave action were provided, and the stress duration curves of different points on armor blocks were analyzed.