海上风电大直径嵌岩单桩侧向承载机理分析
Analysis of lateral bearing mechanism of large-diameter rock-socketed monopile for offshore wind turbine
修衍彬 1张融圣 1王恒丰 1刘寒秋 1朱嵘华2
作者信息
- 1. 浙江大学 海洋学院,浙江 舟山 316021
- 2. 浙江大学 海洋学院,浙江 舟山 316021;阳江海上风电实验室,广东 阳江 529500
- 折叠
摘要
针对我国海上风电基础的大量嵌岩需求,文章采用物理模型试验及数值模拟方法研究了大直径嵌岩单桩基础的水平受荷特性以及桩-岩整体失效模式,分析了基岩强度、桩基直径、桩基壁厚、嵌岩深度等因素对嵌岩桩侧向承载性能的影响.研究结果表明:桩身抗弯能力随基岩强度提高而提高;嵌岩桩基础浅层基岩的破坏遵循被动楔形破坏模式,深层基岩的破坏遵循旋转破坏模式;基岩强度、桩基直径和嵌岩深度的增加均能提高桩基水平承载力,而桩基壁厚对其影响不大;对于嵌岩桩水平承载性能的提升效果存在临界嵌岩深度,桩径及覆盖层厚度对临界嵌岩深度的影响较小,而基岩强度对其变化较为敏感.
Abstract
In view of the large number of rock-socketed demand of offshore wind power foundation in China,horizontal loading characteristics and pile-rock integrated failure mode of large diameter rock-socketed monopile foundation are studied by combining physical model test and numerical simulation method,and the analysis of the influences of bedrock strength,pile foundation diameter,wall thickness and rock-socketed depth on the horizontal bearing capacity of rock-socketed pile is carried out.The research shows that the flexural capacity of pile increases with the increase of bedrock strength.The failure mode of shallow bedrock of rock-socketed pile foundation follows passive wedge failure mode,while the failure mode of deep bedrock follows rotating failure mode.The horizontal bearing capacity of pile foundation can be improved with the increase of bedrock strength,pile diameter and depth of rock socketed,but the pile thickness has little effect on it.Critical depth of rock-socketed pile is found to improve the horizontal bearing capacity of rock-socketed pile.Pile diameter and overburden thickness have little effect on critical depth of rock-socketed pile,while bedrock strength is sensitive to its change.
关键词
海上风电/嵌岩/单桩基础/侧向承载机理/敏感性分析Key words
offshore wind turbine/rock-socketed/monopile foundation/lateral bearing mechanis/sensitivity analysis引用本文复制引用
基金项目
广东省重点领域研发计划项目(2022B0101100001)
出版年
2024
国家科技期刊平台
NSTL
万方数据