摘要
采用弹塑性边界面本构模型,建立模拟黏土中三桶基础承载行为的三维数值方法,并通过对已有模型试验结果的预测验证数值方法的可行性。研究桶-土接触方式和加载方向对三桶基础承载行为的影响规律,探索三桶基础的水平循环承载特性。结果表明,竖向单调荷载作用下三桶基础表现为“刺入型”剪切破坏特征,基础竖向受压失效位移约为0.07D(D为桶基础的直径);在摩擦接触条件下,0°水平加载(单桶受拉,双桶受压)极限承载力最小;在绑定接触条件下,60°水平加载(双桶受拉,单桶受压)极限承载力最小;循环荷载作用下迎风桶与背风桶之间逐渐增加的沉降差是三桶基础产生累积旋转的主要原因,且基础的旋转特性与水平循环荷载大小密切相关。
A three-dimensional numerical method is developed to simulate the bearing behavior of tripod suction bucket in clays by employing an elastic-plastic bounding surface constitutive model,and then the feasibility of the numerical method is verified by predicting the existing model test results.The effects of bucket-soil contact mode and loading direction on the bearing behavior of tripod suction bucket is studied,and its bearing characteristics under lateral cyclic load are explored.The research results show that the tripod suction bucket under vertical load is characterized by"piercing"shear failure,and the failure displacement of vertical compressive foundation is about 0.07D(D is the bucket diameter).The ultimate bearing capacity at 0°horizontal loading direction(single bucket under uplift,double bucket under compression)is the smallest under the friction contact condition;the ultimate bearing capacity at 60°horizontal loading direction(double bucket under uplift,single bucket under compression)is the smallest under the tie contact condition.The increasing of settlement difference between the windward bucket and the leeward bucket under cyclic load is the main reason for the cumulative rotation of the tripod bucket foundation,and the rotation characteristics of the foundation are closely related to the horizontal cyclic load scale.
作者
汪明元
陆佳清
巴盼锋
程星磊
鹿群
Wang Mingyuan;Lu Jiaqing;Ba Panfeng;Cheng Xinglei;Lu Qun(Power China Huadong Engineering Corporation Limited,Hangzhou 310014,China;Key Laboratory of Soft Soil Engineering Character and Engineering Environment of Tianjin,Tianjin Chengjian University,Tianjin 300384,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2024年第6期589-598,共10页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(52108334)
天津市自然科学基金(22JCYBJC01360)
中国电建集团华东勘测设计研究院有限公司科技项目(KY2020-KC-08-01-2021)。
关键词
海上风电
黏土
循环荷载
加载方向
吸力桶
offshore wind turbines
clay
cyclic load
loading direction
suction bucket
