地震荷载下大直径单桩基础承载特性影响因素分析

摘 要 海上风电机单桩基础结构简单、便于安装, 但是在地震环境下, 易出现较大的水平位移, 影响海上风电机的安全运行。为此, 对地震荷载下海上风电大直径单桩承载特性及影响因素进行分析, 以Mohr-Coulomb模型为本构模型, 采用ABAQUS构建海上风电大直径单桩有限元模型, 通过人工合成波施加地震荷载, 分析地震荷载下海上风电大直径单桩承载特性及影响因素。研究发现, 桩基入土深度增大会显著减小单桩桩顶处水平位移, 增大到一定程度后对大直径单桩水平变形的发展没有显著的影响；随着桩基直径和壁厚的增大, 大直径单桩桩基变形减小, 但是桩基壁厚增加到一定程度后, 其对大直径单桩桩基水平变形的影响不再显著。

Analysis of Factors Affecting Bearing Capacity of Large Diameter Single Piles of Offshore Wind Power Under Earthquake Loads

The offshore wind turbine single pile foundation structure is simple and easy to install, but in the earthquake environment, large horizontal displacement is easy to occur, which affects the safe operation of offshore wind turbines. For this reason, the bearing characteristics and influencing factors of large-diameter single-pile offshore wind power under earthquake load are analyzed. The Mohr-Coulomb model is used as the model. The ABAQUS is used to construct the large-scale single-pile finite element model of offshore wind power. Loads and analysis of bearing characteristics and influencing factors of large-diameter single-pile offshore wind power under seismic loading. It is found that the increase of pile foundation depth will significantly reduce the horizontal displacement at the top of single pile. After increasing to a certain extent, it has no significant effect on the development of horizontal deformation of large diameter single pile; with the increase of pile diameter and wall thickness The deformation of large and large diameter single pile foundation is reduced, but the influence of the pile foundation thickness on the horizontal deformation of the large diameter single pile foundation is no longer significant.