砂土中大直径单桩极限水平抗力的数值模拟  

Numerical Simulation of Ultimate Horizontal Resistance for Large Diameter Monopiles in Sand

作　　者：刘德广 罗成喜 王栋 Liu Deguang;Luo Chengxi;Wang Dong(Key Laboratory of Marine Environment and Ecology,Ministry of Education,Ocean University of China,Qingdao 266100,China;Shandong Engineering Research Center of Marine Exploration and Conservation,Qingdao 266100,China;PowerChina Zhongnan Engineering Corporation Limited,Changsha 410014,China)

机构地区：[1]中国海洋大学海洋环境与生态教育部重点实验室,山东青岛266100 [2]中国海洋大学海底建设与保护山东省工程研究中心,山东青岛266100 [3]中国电建中南勘测设计研究院有限公司,湖南长沙410014

出　　处：《中国海洋大学学报(自然科学版)》2025年第5期149-156,共8页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(42025702)资助。

摘　　要：国内外近海风机大多采用大直径单桩基础,大直径单桩设计的控制工况通常是水平荷载下的响应。传统API方法主要用于细长桩,近年发展起来的PISA方法用四类弹簧表征土体对桩的反力,原理上更适合低长径比的单桩,但PISA方法中的极限水平抗力计算存在很大争议。本文选取我国南海典型砂土参数进行有限元分析,变化土体相对密实度、桩径和长径比等关键参数,比较桩基响应曲线,发现了三种广泛采用的极限水平抗力表达式均有明显局限性。最后基于大量变动参数有限元分析,建议采用两段式表达极限水平抗力随深度的变化。Most offshore wind turbines at home and abroad use large diameter monopile foundation,and the control condition of large diameter monopile design is usually the response under horizontal load.The traditional API method is mainly used for slender piles,and the PISA method developed in recent years uses four kinds of springs to represent the reaction force of soil to piles,which is more suitable for monopiles with low aspect ratio in principle,but there is great controversy about the calculation of ultimate horizontal resistance in PISA method.The typical sand parameters in the South China Sea are selected for finite element analysis,and the key parameters such as soil relative density,pile diameter and aspect ratio are changed,and the response curves of pile foundation are compared.It is found that the three widely used expressions of ultimate horizontal resistance have obvious limitations.Based on the finite element analysis of a large number of variable parameters,it is suggested to express the change of ultimate horizontal resistance with depth in two stages.

关 键 词：大直径单桩 砂土 水平荷载 有限元法 长径比 

分 类 号：TU473.1[建筑科学—结构工程]