基于现场监测分析冲刷对海上风电大直径钢管桩的影响

Analysis of the Impact of Scouring on Large-diameter Steel Pipe Piles in Offshore Wind Farm based on Field Monitoring

基于对海上风电大直径钢管桩的监测数据分析了冲刷对钢管桩的影响。理论计算显示,风机基础冲刷会导致结构整体刚度下降,同时增大风机基础桩端位移。现场监测结果表明,风机的一阶频率监测值会在一定幅度范围内围绕设计值波动,一段较长时间的监测频率值基本能反映风机实际在位频率或接近设计频率。从监测结果可以看出,针对风机中存在的密集模态,需要采用进一步的手段识别分析。其研究成果为海上风电工程的开发和建设提供了重要的技术支持和参考依据。

Based on field monitoring data,the impact of scouring on large-diameter steel pipe piles in offshore wind farm is analyzed.Theoretical calculation shows that scouring of the wind turbine foundation may lead to the decrease of the overall stiffness of the structure,and the increase of the displacement of the foundation pile end.Field monitoring results show that the first-order frequency monitoring value of the wind turbine fluctuates around the design value within a certain range.The frequency value from a longer monitoring period can basically reflect the actual on-site frequency or close to the design frequency.From the monitoring results,it can be seen that further identification and analysis are needed for the dense mode of the wind turbines.These findings provide important technical support and reference for the development and construction of offshore wind power projects.