海上风电场不同结构形式桩基局部冲刷数值模拟

Numerical simulation of local scouring around different structural forms of pile foundations for offshore wind farm

为分析海上风电场工程不同结构形式桩基局部冲刷特点,以江苏省南通市如东县烂沙洋海域的海上风电场工程为背景,利用Flow 3D开展了单桩基础、三桩导管架基础和高桩承台基础冲刷的三维数值模拟研究,并分析了基础局部流场及冲刷过程。结果显示:单桩基础、三桩导管架和高桩承台基础附近的水流流场、冲刷发展过程、冲刷坑形态与冲刷深度均有差异;相同水文、泥沙动力条件下,单桩基础的冲刷深度最大,其次为三桩导管架基础,高桩承台基础局部冲刷深度最小。可见,海上风电场工程基础的结构形式对局部冲刷发展有着显著的影响,在设计优化基础结构和实施防护措施时需考虑结构形式的影响。

In order to analyze local scouring characteristics around different shapes of pile foundations in offshore wind farm,numerical models for local scouring around single-pile,three-pile jacket and high-pile cap foundations were constructed by Flow 3D.Local flow field and scouring process around three types of the pile foundations were simulated,which showed different flow fields,scouring processes,scour pit’s shape and depth.Scouring pit of the single-pile foundation was the deepest,followed by that of three-pile jacket foundation and scour pit of the high pile cap foundation was the shallowest under the same hydrological and sediment dynamic conditions.These results indicated that structural forms of pile foundations had significant effect on local scouring in offshore wind farm.Therefore,the structure forms should be considered in optimization design of pile foundations and implementation of protective measures.