波浪作用下抛石潜堤的动态稳定数值模拟

抛石潜堤在港口工程中得到广泛应用, 该文运用离散单元法中的二维颗粒流方法建立了抛石潜堤模型, 分析了刚度和摩擦系数两个细观参数对模型分析的影响。结合工程实例, 合理确定了抛石潜堤颗粒流模型的细观参数, 克服了传统连续介质力学的宏观连续性假设, 形象而直观的模拟分析了抛石潜堤的动状稳定破坏。研究表明, 在波浪荷载作用下, 抛石重量是影响失稳的主要因素, 其次是堤顶宽度及断面坡度。抛石重量越大, 堤顶宽度越大, 断面坡度越缓, 则抛石潜堤的整体稳定性越好。应用此结论, 针对该工程, 对抛石潜堤进行了结构优化, 得到不同的抛石块体以及不同的断面形状的优化潜堤结构。

NUMERICAL SIMULATION OF DYNAMIC STABILITY FOR RIPRAP BREAKWATER UNDER WAVE LOADS

Riprap breakwater has been widely used in port engineering. The model of riprap breakwater has been established by the two-dimensional particle flow method of discrete element methods, and the effect of two mesoscopic parameters including the stiffness and friction coefficient on model analysis has been analyzed. The parameters of the riprap breakwater particle flow model, which overcomes macro-continuity hypothesis in traditional continuum mechanics, have been determined by reasonably combining with engineering practice. Besides, the simulation analysis on the dynamic stability damage of the riprap breakwater has been made in a direct way. The research indicates that the weight of the breakwater is the main factor, which influences instability, and the second is the width of the levee crest and the grade of section. The overall stability of a riprap breakwater is better when the enrockment is heavier, the width of the levee crest is larger and the slope is slower. As for this project, structural improvement has been made for the riprap breakwater, and optimal submerged breakwater structures with different weight riprap and section shapes have been obtained by the application of this conclusion.