抛石防波堤稳定性的离散单元法分析

STABLITY ANALYSIS OF RUBBLE MOUND BREAKWATER BY DISCRETE ELEMENT METHOD

将抛石防波堤认为离散介质结构,首次运用二维刚性体离散单元法对抛石防波堤在波浪作用下的失稳过程和机理进行了研究。该计算模型和方法可以模拟抛石防波堤块体在波浪作用下的局部失稳和从局部失稳到整体失稳的变化过程。计算结果显示周期和波高越大,波浪的作用力也越大,对防波堤的破坏作用依次增大,防波堤的局部失稳主要表现为两侧堤肩块体的失稳,整体失稳是局部失稳累积的结果,抛石防波堤的破坏现象和波浪理论得到验证。

The rubble mound breakwater is considered as a discrete medium structure. For the first time, the two-dimensional rigid Discrete Element Methods （DEM） is used to investigate the process and mechanism of the rubble mound breakwater stability loss under a wave attack. The calculation model and method can simulate the local stability loss of the rubble mound and the process from a partial stability loss to a total stability loss. The calculation result shows that the larger the wave period and wave height, the bigger the wave attack will be, and accordingly, the bigger damages on the rubble mound breakwater are caused. The partial instability of the rubble mound breakwater is marked by the stability loss of the blocks on both shoulders of the mound. The total stability loss is the result of the accumulative partial instability, the damage of the rubble mound breakwater and the wave theory are verified.