不同水深条件下海上风机群桩基础局部冲刷特性

Characteristics of Local Scour surrounding a Multi-pile Foundation of Offshore Wind Turbine at Different Water Depths

在清水状态下,对不同水深和间距比条件下的群桩局部冲刷进行了三维数值模拟研究。结果表明,水深(h)对冲刷特性的影响与间距比(G/D)有关。当G/D=2、4和5时,随着水深的增大,平衡冲刷深度小幅增大,当G/D=3时,随着水深的增大,平衡冲刷深度显著增大。随着间距比的增大,平衡冲刷深度非单调变化。G/D=2工况的平衡冲刷深度最大,群桩冲刷坑形成一个整体;G/D=3工况的平衡冲刷深度最小,下游桩柱周围冲刷不明显;G/D=4、5工况的平衡冲刷深度较大,且随间距比的增大而减小,各个桩柱的冲刷坑独立。

Under clear-water conditions,a three-dimensional numerical simulation of the local scour around a multi-pile foundation was carried out at different water depths and spacing ratios.The results show that the effect of water depth(h)on scour characteristics is related to the spacing ratio(G/D).When G/D=2,4 and 5,the equilibrium scour depth increases slightly with the increase of water depth,and when G/D=3,the equilibrium scour depth increases significantly with the increase of water depth.As the spacing ratio increases,the equilibrium scour depth changes non-monotonically.The equilibrium scour depth is the largest in the case with G/D=2 where the multiple scour pits form a whole.The equilibrium scour depth at G/D=3 is the smallest,and the scour around the downstream piles is insignificant.At G/D=4 and 5,the equilibrium scour depth is relatively large,decreasing with the increasing spacing ratio,and the scour pits are independent.