大数量桩柱波浪力的机理研究

On Mechanism of Wave Forces on Large Number of Piles

研究了大数量桩柱的波浪力特性。基于特征函数展开和块矩阵求逆方法,导出了一种计算大数量桩柱波浪力的递推算法。数值结果表明,在周期性布置的桩柱阵列中,在某些特定的波浪频率下,存在"波浪俘获"现象。当发生波浪俘获时,波浪力的幅值可呈几倍到几十倍的增加。采用不等间距的桩柱,可有效地减小桩柱在特殊频率下的受力幅值。

The present study is aimed to give a general analysis of the wave forces on large number of piles. Based on characteristic function expansion method and block matrix-inverse method, a recurrent algorithm for the wave forces on large number of piles is established. For the periodical distributed pile array, numerical results show the existence of the trapped wave at some special wave frequencies. When the trapped wave happens, the wave force amplitude on the pile array may reach several or ten times one on single pile. For the pile array of non-uniform layout, the wave force amplitude at such special wave frequencies can be reduced effectively.