采用固化土防护技术的海上风机单桩基础防冲刷效果数值分析  

Numerical analysis of anti-scour effect for offshore wind turbine monopile foundation under solidified soil protection

作　　者：张诗怡 张研 刘畅 ZHANG Shi-yi;ZHANG Yan;LIU Chang(College of Harbor,Coastal and Offshore Engineering,Hohai University,Nanjing,Jiangsu 210024,China;PowerChina Zhongnan Engineering Corporation Limited,Changsha,Hunan 410014,China)

机构地区：[1]河海大学港口海岸与近海工程学院,江苏南京210024 [2]中国电建集团中南勘测设计研究院有限公司,湖南长沙410014

出　　处：《中国港湾建设》2024年第8期1-8,共8页China Harbour Engineering

基　　金：国家自然科学基金(51579088)。

摘　　要：海上风机基础桩周易发生局部冲刷。固化土防护技术在路基处理、桥墩防护等领域中有广泛应用,并逐步在海上风机工程中开展试点研究。针对江苏省东部某沙脊群海域的海上风电工程项目,使用Flow-3D软件建立恒定流作用下单桩式风机模型。模拟结果与经典试验和经验公式对比,发现无固化土防护的单桩模型能较准确地模拟流场形态并预测最大冲刷深度。此外,固化土防护下的模拟结果与工程现场地形扫测图对比,发现有较好的吻合性。通过对比固化土的保留率和最大冲刷深度,发现固化土的最佳防护半径为2倍桩径。在流速超过4 m/s的流域,固化土防护效果较差,验证了实际工程中通常将固化土的抗冲刷能力设定为能够承受4 m/s的水流冲刷。Local scour is prone to occur around offshore wind turbine pile foundation.The solidified soil protection has widely used in the field of subgrade treatment,bridge pier protection,etc.,and the pilot research is gradually carried out in offshore wind turbine projects.Based on an offshore wind power project in a sand ridge sea area in the eastern part of Jiangsu Province,the numerical simulations are carried out by using Flow-3D to establish the models of offshore wind turbine monopile foundation under constant flow.Comparing with classical tests and empirical formulas,simulation results demonstrate that the model of offshore wind turbine monopile foundation without solidified soil protection can accurately simulate the flow field and predict the maximum scour depth.Also,there is a good agreement between the simulation results of monopile foundation model protected by solidified soil and the scanning pictures around the monopile.By comparing the retention rates and the maximum scour depths of solidified soil,the optimum protection radius of solidified soil is considered as 2 times of the pile diameter.Solidified soil protection is less effective in protecting the seabed where the flow velocity is over 4 m/s,which verifies that the solidified soil is generally designed to resist scouring by flow velocity of 4 m/s in practical engineering construction.

关 键 词：海上风机 单桩基础 冲刷 固化土防护 数值模拟 

分 类 号：U655.54[交通运输工程—港口、海岸及近海工程] TU476[交通运输工程—船舶与海洋工程]