不同桩基冲刷计算方法的比较分析

Comparison and Analysis of Different Methods for Pile Scour

以福建省某海上风电场环境条件为基准,选取国内常用的冲刷计算方法,并对环境和桩基参数进行规律性变化,研究不同方法的计算结果并做比较分析。结果显示,(65-1)修正式对流速和水深非常敏感,(65-2)式对底质粒径较小的环境非常敏感,两者在某些情况下稳定性欠佳。除底质粒径过小的情况外,(65-2)式与韩海骞公式、CSU方程、Sumer方法均保持了很好的一致性。一般情况下,所列方法均可以预报桩基冲刷深度,但需要根据实际情况选择合适的方法,保证计算的准确。

Based on the environmental conditions of an offshore wind farm in Fujian province, the scour calculation methods commonly used in China are selected, parameters of the environment and pile foundation are regularly changed to research the results of different methods. The results show that the modified equation (65-1) is highly sensitive to flow rate and water depth, while the equation (65-2) is very sensitive to small grain size of sediment, and they will be unstable in some cases. Except for the case that the grain size of sediment is too small, the equation (65- 2) is in good agreement with Han Haiqian Formula, CSU equation and Sumer method. In general, the method listed in this paper could be used to predict the pile scouring depth, but it is necessary to select an appropriate method according to the actual situation to ensure the accuracy of calculation.