冲刷现象对海上风力机单桩基础水平承载性的影响

Influence of Scouring on Horizontal Loading Capability of Monopile Foundation of Offshore Wind Turbines

结合涠洲海域某风电场项目的工程实例,建立了海上风力机单桩基础的桩土有限元模型,采用p-y曲线法探讨了冲刷坑对单桩水平承载性的影响,分析了不同冲刷深度对支撑结构动力学特性的影响规律.研究结果表明,无冲刷现象时桩身的最大弯矩会出现在海床以下5 m左右;当冲刷深度为1 m时,桩身最大弯矩出现的位置也下降1 m.当冲刷深度小于1.3倍桩径时,基桩整体的位移、弯矩、应力均缓慢上升.当冲刷深度到达2倍桩径时,基桩的固有频率会降低1.8%.

A pile-soil finite element model for the single pile foundation of offshore wind turbines is established.The influence of scouring on horizontal loading capability of monopile foundation is discussed by P-Y curve method.And the effect of different scouring depth on the dynamic characteristics of foundation structures has been analyzed.The research results show that the maximum bending moment of the pile foundation appears about 5 meters below the seabed when there is no scouring,and the minimum bending moment is 1 meter when the scouring depth is 1 meter.The displacement,bending moment and stress of the monopile foundation increase slowly when the scour depth is less than 1.3 times the pile diameter.And its natural frequency decreases by 1.8%when the scour depth reaches 2 times the pile diameter.