海底电缆铺设过程中受力特性数值模拟研究

目的  以江苏启东某海上风电场建设项目为工程背景，开展海底电缆铺设过程中的力学特性数值模拟研究，分析不同挖沟深度的工况下海缆悬跨段的局部应力分布情况。 方法  基于ABAQUS数值模拟软件，建立海底电缆埋设数值模型。 结果  研究结果显示：海底电缆后缘提升点在埋设过程中的应力相较于埋设作业前显著增大，该位置的缆线在整个埋设过程中受力最大，是最危险的位置；挖沟深度对海底电缆后缘提升点处的应力有显著影响，随着挖沟深度的增加，后缘提升点处的应力相应增大。 结论  海底电缆铺设作业中应加强保护抬升点处的缆线材料，缆线的屈服应力参数选取应着重参考埋设作业中缆线的受力分析结果。研究成果可为海底电缆铺设作业提供参考依据。

Numerical Simulation Study on Mechanical Characteristics of Submarine Cable During Laying Process

  Introduction  Based on an offshore wind farm construction project in Qidong, Jiangsu Province, the numerical simulation study on mechanical characteristics of submarine cable during laying process was carried out and the local stress distribution of the suspension span of submarine cables under different trenching depths was analyzed.   Method  A numerical model of submarine cable laying based on ABAQUS numerical simulation software was established.   Result  Results show that the stress of the lifting point at the trailing edge of the submarine cable increases significantly during the burial process compared with that before the burial operation. This is the most dangerous position as the cable at this position has the largest stress during the whole burial process. The trenching depth has a significant effect on the stress at the lifting point at the trailing edge of the cable. With the increase of the trenching depth, the stress at the lifting point at the trailing edge increases correspondingly.   Conclusion  The selection of cable material at the lifting point should be protected in the cable laying operation, and the yield stress parameters of the cable should be mainly based on the stress analysis results of the cable in the burial operation. The research results can provide a reference for submarine cable laying operation.