海上风机变径单桩基础水平承载特性数值分析

为研究海上风机变径单桩基础承载性能,通过有限元分析软件ABAQUS建立变径桩数值模型,开展变径单桩水平承载性能的数值模拟研究,分析其相对于通长单桩基础的承载性能优势,并针对变径段尺寸进行参数分析。结果表明：变径桩极限承载力较通长桩存在明显提高,相同水平荷载作用下,变径单桩基础桩身位移明显减小,其水平承载能力要优于通长桩基础;变径桩基础中底部桩径和变径段埋深高度对水平承载力影响较为明显,增大底部桩径与减小变径段埋深均能提升桩基的极限水平承载能力,但变径段长度对变径桩基础水平承载能力影响很小。可见变径单桩水平承载性能优于通长桩。研究成果可为深厚砂土地质下的海上风电单桩基础设计与结构优化提供参考依据。

Numerical Analysis of Horizontal Bearing Capacity of Variable Diameter Pile Foundation for Offshore Wind Turbine

In order to study the bearing capacity of the variable diameter pile foundation for offshore wind turbines, a numerical model of the variable diameter pile was established through the finite element analysis software ABAQUS, and the numerical simulation study of the horizontal bearing capacity of the variable diameter pile was carried out to analyze its bearing capacity advantages over the non-variable diameter pile. and further parameter analysis for the size of the variable diameter section was carried out. The results show that the ultimate bearing capacity of variable-diameter piles is significantly higher than that of non-variable diameter pile. Under the same horizontal load, the displacement of the variable diameter pile foundation is significantly reduced, and its horizontal bearing capacity is better than that of non-variable piles; The bottom pile diameter and the height of the buried depth of the variable diameter section in the foundation have a significant impact on the horizontal bearing capacity. Increasing the bottom pile diameter and reducing the buried depth of the variable diameter section can increase the ultimate horizontal bearing capacity of the pile foundation, but the length of the variable diameter section has little effect on the horizontal bearing capacity. It is concluded that the horizontal bearing performance of the variable diameter single pile is better than that of the non-variable pile, and the research results can provide a reference for the design and structural optimization of the offshore wind power single pile foundation under the deep sandy soil.