冲刷情况下海上风电开孔单桩电缆受力特性的影响研究

Study on the Influence of Scour Around Offshore Wind Power Pile on Cable Stress

海上风电工程上广泛采用桩身开孔引入海底电缆进入塔筒内部的连接方式,由此海底电缆产生悬跨段,桩周土体冲刷会改变电缆悬跨状态影响电缆受力特性。因此,分析桩周土体冲刷程度对电缆受力特性的影响规律,具有重要的工程意义。本文采用ABAQUS数值分析软件,建立海底电缆-桩身-海床土体的数值模型,开展冲刷程度对海底电缆受力特性的影响研究。结果显示:当冲刷坑的长度大于海底电缆初始的悬跨长度时,电缆的整体应力分布增大;初始的冲刷坑尺寸增大后,电缆出现3个应力较大的特征位置,分别是冲刷坑边缘、电缆悬跨段最大应力点和桩身开孔处的位置;冲刷坑长度的变化对电缆悬跨段最大应力点处应力的影响最为显著。研究成果可为开孔单桩的防冲刷设计提供参考。

In offshore wind power projects,the connection method of opening the pile body to introduce the submarine cable into the tower cylinder is widely adopted,so the submarine cable will produce suspended span section,and the soil erosion around the pile will change the cable suspended span state and affect the cable mechanical characteristics.Therefore,it is of great engineering significance to analyze the influence of soil erosion degree around piles on the mechanical characteristics of cables.Using ABAQUS numerical analysis software,establish the numerical model of submarine cable-pile-seabed soil,and carry out the research on the influence of scour degree on the force characteristics of submarine cable.The research results show that:when the length of scour pit is greater than the initial suspension span,the overall stress distribution of the cable increases;after the initial scour size increases,the cable appears three characteristic locations with greater stress,namely the edge of the scour pit and the cable overhang section and the opening of the pile;the change of the length of the scouring has the most significant influence on the stress at the maximum stress point of the cable suspension section.The research results can provide a reference for the anti-scouring design of a single hole with a hole.