波浪作用下的群桩受力及优化布置

Mechanical Properties and Optimal Arrangement of Group Piles Acted by Wave Forces

为研究海洋环境中群桩结构所受的波浪力及其合理布置方式,以某群桩水动力模型试验为例,按照CFD理论采用ANSYS Workbench建立波浪水槽及高桩承台数值仿真模型,分析桩距、桩位的变化对各桩受力的影响,总结单桩及总力干扰系数的变化规律。结果表明:垂直波向上,各桩所受波浪力均大于独桩情况,KC数对各桩干扰系数的影响并不明显;平行波向上,各桩所受波浪力均小于独桩情况且桩间影响随桩距的增大均呈减弱趋势,各桩的干扰系数随KC数的增大而减小,这一影响对后桩更为明显。在垂直波向错位布置的群桩,各桩干扰系数较对称及平行波向错位布置时更小,各桩受力也更均匀。

To study the wave forces on the group pile structures and the reasonable arrangement of the structures in the marine environment,the hydrodynamic model test of a group pile structure was cited as an example and the numerical simulation model of the wave tank and the group piles with elevated pile cap was set up,using the ANSYS Workbench,in accordance with the computational fluid dynamics theory.The influences of changing of the pile spacing and pile locations on the forces on the piles were analyzed and the changing laws of the interference coefficients of the single pile and the group pile resultant force were summed up and the results show that when the perpendicular wave goes upwards,the wave forces on the different piles are greater than the wave force on the single pile and the influences of the Keulegan-Carpenter（KC）number on the interference coefficients of the piles are not significant.When the parallel wave goes upwards,the wave forces on the different piles are less than the wave force on the single pile and the influences among the piles tend to decline with the increase of the pile spacing.The interference coefficients of the piles decrease with the increase of the KC number and the influences of such kind on the rear piles are more significant.When the group piles are staggeredly arranged in the direc tion of the perpendicular wave,the interference coefficients of the piles are rather symmetric and when the piles are staggeredly arranged in the direction of the parallel wave,the interference coefficients are even less and the forces on the different piles are more uniform.