海床加固对海上风电单桩基础的动力特性影响
EFFECT OF SHALLOW SEABED REINFORCE ON DYNAMIC PROPERTIES OF MONOPILE OFFSHORE WIND TURBINE FOUNDATION
王海宇 1沈侃敏 2贺瑞 3王宽君2
作者信息
- 1. 中国电建集团华东勘测设计研究院有限公司,浙江省深远海风电技术研究重点实验室,杭州 311122
- 2. 中国电建集团华东勘测设计研究院有限公司,浙江省深远海风电技术研究重点实验室,杭州 311122;浙江华东建设工程有限公司,海洋岩土工程勘察技术与装备浙江省工程研究中心,杭州 310014
- 3. 河海大学港口海岸与近海工程学院,南京 210098
- 折叠
摘要
建立海上风电单桩基础浅层土体三维数值有限元模型,分析不同范围、不同形状海床加固方式,以及作用不同幅值、不同方向循环荷载单桩基础的累积变形、振动特性动力响应影响,为加固体应用于单桩桩周土体加固工程提供优化建议.结果表明:不同加固条件下,风力机一阶自振频率改变较为显著;加固后单桩基础相较于未加固单桩基础,在循环荷载作用下,单桩桩身位移、转角和内力响应极值均有所减小,泥面位移极值最多可降低81%;桩周土体剪应力与剪应变亦减小,随着循环次数增加,剪应变增幅减少,土体塑性区域变小.
Abstract
A three-dimensional numerical finite element model for shallow soil reinforcement of monopile offshore wind turbine foundation is established to analyze the effects of different ranges and shapes,as well as the cumulative deformation and dynamic response of monopile foundations under cyclic loads of different amplitudes and directions.The results provide optimization suggestions for the application of reinforcement in soil reinforcement around monopiles.The results show that under different reinforcement conditions,the first-order natural frequency of the wind turbine changes significantly;after reinforcement,compared with unreinforced monopile foundations,the displacement,rotation angle and internal force response under cyclic loads of monopiles are all reduced,and the displacement at mudline can be reduced by up to 81%;the shear stress and shear strain of the soil around the pile are also reduced.As the number of cycles increases,the increase in shear strain decreases and the plastic zone of the soil becomes smaller.
关键词
海上风电/桩基础/土-结构物相互作用/循环荷载Key words
offshore wind power/pile foundations/soil structure interaction/cyclic loads引用本文复制引用
基金项目
国家自然科学基金(5210133452108356)
出版年
2024
NETL
NSTL
万方数据