复合筒型基础浮运允许压差研究

The Allowable Differential Air Pressure during Floating of Composite Bucket Foundation

复合筒型基础分舱间允许压差对其安全运输具有重要意义,针对复合筒型基础浮运过程中允许压差问题,以某海上风电项目中复合筒型基础浮运工程为背景,基于有限元软件ABAQUS定量分析了复合筒型基础浮运过程中允许压差与基础外吃水、分舱板厚度、基础直径、内舱压强值等参数变化的影响。研究结果表明:复合筒型基础浮运过程中分舱板Mises应力最大值与允许压差最大值随外吃水和分舱板厚度的增加表现为指数增长趋势,但相对于分舱板厚度变化,基础分舱板允许压差最大值对外吃水变化比较敏感;分舱板增设加强肋对复合筒型基础允许压差最大值有20%~35%的显著提升。当允许压差最大值确定时,可以根据实际工程需要选取基础各变化参数安全组合中的最优解。

The allowable differential air pressure in compartments of composite bucket foundation is of great significance for its safe transportation.For the problem of the allowable differential air pressure during floating transportation of composite bucket foundation,taking the floating project of composite bucket foundation in an offshore wind power project as the background,the influence of the allowable differential air pressure of composite bucket foundation with the change of parameters such as external draft and diameter of composite bucket foundation,the bulkhead thickness,and air pressure in compartments were quantitatively analyzed based on finite element software ABAQUS.The results show that:the maximum allowable differential air pressure increases exponentially with the increase of draft and bulkhead thickness.But the maximum allowable differential air pressure on bulkheads is more sensitive to the change of draft,rather than bulkhead thickness.The addition of reinforcing ribs to the bulkheads has a significant increase of 20%~35%in the maximum allowable differential air pressure of composite bucket foundation.For a specific maximum allowable differential air pressure,the optimal solution in the safe combination of the variation parameters of foundation can be selected according to the actual engineering needs.