上软下硬黏土中四筒基础抗倾覆承载特性研究  

The anti-overturning bearing capacity of four-bucket foundation in clay with soft layers on top and hard layers at the bottom

作　　者：练继建[1] 曹政[1] 杨旭[1,2] 黎慧珊[1] LIAN Jijian;CAO Zheng;YANG Xu;LI Huishan(State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation,Tianjin University,Tianjin 300350,China;Institute of Marine Energy and Intelligent Construction,Tianjin University of Technology,Tianjin 300382,China)

机构地区：[1]天津大学水利工程智能建设与运维全国重点实验室,天津300350 [2]天津理工大学海洋能源与智能建设研究院,天津300382

出　　处：《海洋工程》2024年第1期1-10,共10页The Ocean Engineering

摘　　要：随着海上风电向深远海发展,四筒基础发展潜力巨大。中国大多数海域存在较厚的上覆软土层,对基础抗倾覆承载能力有着重大影响。采用有限元软件ABAQUS建立上软下硬分层黏土模型,对四筒基础在单向水平荷载和弯矩荷载作用下的承载力特性进行研究。研究结果表明:四筒基础在水平、弯矩荷载作用下主要运动模式为转动,对边加载时,转动轴靠近受压筒且随着软土层厚度增加不断靠近四筒基础平面中心,但变化幅度较小;水平和弯矩极限承载力对于不同的筒间距和长径比具有相同的变化趋势,当软土层厚度h/筒高L≤3/4时,水平和弯矩承载力随着软土层厚度的增加近似线性降低,当h/L>3/4后,承载力降低速率明显减小。With the development of offshore wind energy in deep waters,the four-bucket foundation shows promising potential.In many sea areas,there exists a thick overlying layer of soft soil,which significantly influences the anti-overturning bearing capacity of foundations.Therefore,this study utilizes the ABAQUS numerical model to investigate the horizontal load and bending moment bearing capacity of a four-bucket foundation in layered clay,with a soft layer on top and a hard layer at the bottom.The analysis reveals that the primary displacement mode of the four-bucket foundation is rotational,with the rotation axis closed to the compression tube and approaching the center of the foundation surface plane.However,the rotation range remains limited.When the ratio of soft soil thickness to bucket height is below 3/4,the horizontal load and bending moment bearing capacity exhibit a linear decrease as the soft soil thickness increases.Beyond a ratio of 3/4,the reduction rate of bearing capacity decreases significantly.Notably,the variation in bearing capacity,both in terms of horizontal load and bending moment,follows the same pattern for different bucket spacing and length-diameter ratios.

关 键 词：海上风电 四筒基础 表层软土 旋转中心 承载能力 

分 类 号：P751[交通运输工程—港口、海岸及近海工程] TU47[天文地球—海洋科学]