不同灌浆效果下黏土海床导管架桩基础的竖向承载特性离心试验  

Centrifuge Tests on Vertical Bearing Capacity of Jacket Pile Foundation in Clay Seabed Under Different Grouting Effects

作　　者：宋俊霖 刘博 唐立恒 廖晨聪 SONG Junlin;LIU Bo;TANG Liheng;LIAO Chencong(State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;China Electric Ocean Energy Engineering Technology Research Institute,Guangzhou 510663,China;China Energy Engineering Group Guangdong Electric Power Design Institute Co.,Ltd.,Guangzhou 510663,China)

机构地区：[1]上海交通大学海洋工程国家重点实验室,上海200240 [2]中电海洋能源工程技术研究院,广州510663 [3]中国能源建设集团广东省电力设计研究院有限公司,广州510663

出　　处：《上海交通大学学报》2025年第1期38-47,共10页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金(52279106);上海市晨光计划(20CG15);上海市教委科研创新计划(2021-01-07-00-02-E00089)。

摘　　要：在40~60 m水深海域,海上风力发电机多使用导管架基础作为主要支撑结构.导管架通过水下高强灌浆与桩基础顶部连接,形成顶端密封段,共同承载竖向荷载.针对桩基顶部灌浆正常、灌浆不足、灌浆不良存在通孔3种不同灌浆效果开展离心模型试验,分析极限状态下基础的竖向承载力及灌浆段与桩身段的承载力分担比,并与现有理论计算方法进行对比.结果表明,灌浆密封顶盖的承载力取决于密封效果.对于灌浆密封顶盖灌浆正常和灌浆不足的基础,灌浆密封顶盖的承载力约占基础总承载力的25%~30%;灌浆不良存在通孔时,基础灌浆段承载力发挥较早且很快达到极限,其分担比远低于其他两者承载力.试验结果可为导管架桩基础设计中的灌浆段承载力计算提供参考依据.Jacket foundations are often used as the main support structure for offshore wind turbines in waters with a depth of 40—60 meters.The jacket foundation is connected to the top of the pile foundation through underwater high-strength grouting to form a top sealing section,which together bears the vertical load.In this paper,centrifugal model tests are conducted for three different grouting effects:normal grouting at the top of a pile foundation,insufficient grouting,and poor grouting with through-holes.The vertical bearing capacity of the foundation and the bearing capacity sharing ratio between the grouting section and the pile body section under the limit state are analyzed,and compared with existing theoretical calculation methods.The results show that the bearing capacity of the grouting sealing cap depends on the sealing effect.For foundations with normal grouting and insufficient grouting of grouting sealing caps,the bearing capacity of grouting sealing caps accounts for approximately 25%—30%of the total bearing capacity of the foundation.When there are through-holes in poor grouting,the bearing capacity of the foundation grouting section develops early and quickly reaches its limit,whose sharing ratio is far lower than the other two bearing capacities.The test results in this paper can provide a reference for the calculation of bearing capacity in foundation design.

关 键 词：离心模型试验 顶部灌浆桩基 不排水抗剪强度 竖向承载力 分担比 

分 类 号：TU473[建筑科学—结构工程]