海上风力发电机桶形基础竖向初始动阻抗影响因素分析

摘要

A finite element model of bucket foundation embedded in an elastic half-space was established using the finite element software ABAQUS.The accuracy of simulated results of the model was verified by comparing the numerical solution with existing analytical solutions.The influences of different factors on the vertical initial dynamic impedance of bucket foundation and the relationship between initial dynamic impedances of the bucket foundation and shell foundation were studied.The results show that the length-to-diameter ratio and thickness-to-diameter ratio of the bucket foundation,soil Poisson's ratio,soil shear modulus,and soil nonhomogeneity have significant influence on the initial impedance,while bucket foundation material has little influence on the initial impedance.The initial impedances of the bucket foundation and shell foundation are nearly the same,and the bucket foundation can be simplified as the shell foundation in simulated calculation.%利用ABAQUS大型通用有限元软件,建立弹性半空间中的海上风力发电机桶形基础(简称桶基)有限元模型.将数值解与已有解析解对比,验证桶基数值模型的准确性.并研究不同因素对桶基竖向初始动阻抗的影响,以及桶基与桶壁壳基础初始动阻抗的关系.结果表明,桶基长径比、桶基厚径比、土体泊松比、土体剪切模量、土体非均匀性对初始动阻抗影响明显,桶基材料对初始动阻抗影响不大;桶基和桶壁壳基础初始动阻抗基本重合,桶基可以退化为桶壁壳基础进行模拟.