植入式嵌岩三桩导管架基础竖向承载特性研究  

Vertical Bearing Characteristics of Embedded Rock-socketed Three-pile Jacket Foundation

作　　者：雷传 赵凯 胡雨承 苏凯[3,4,5] LEI Chuan;ZHAO Kai;HU Yucheng;SU Kai(PowerChina Huadong Engineering Corporation Limited,Hangzhou 311122,Zhejiang,China;Zhejiang East China Engineering Consulting Co.,Ltd.,Hangzhou 311100,Zhejiang,China;State Key Laboratory of Water Resources Engineering and Management(Wuhan University),Wuhan 430072,Hubei,China;Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering(Ministry of Education),Wuhan University,Wuhan 430072,Hubei,China;Hubei Provincial Key Laboratory of Water System Science for Sponge City Construction,Wuhan University,Wuhan 430072,Hubei,China)

机构地区：[1]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122 [2]浙江华东工程咨询有限公司,浙江杭州311100 [3]水资源工程与调度全国重点实验室(武汉大学),湖北武汉430072 [4]武汉大学水工岩石力学教育部重点实验室,湖北武汉430072 [5]海绵城市建设水系统科学湖北省重点实验室(武汉大学),湖北武汉430072

出　　处：《水力发电》2025年第5期104-111,共8页Water Power

基　　金：国家自然科学基金资助项目(51379159)。

摘　　要：导管架基础因具有整体刚度大的优势成为越来越多海上风电场的首选基础形式。对于我国广西等近海海床地质条件为基岩的地区,风机基础常采用植入式建设方式,钻孔后植入钢管桩并在桩侧灌浆处理。然而目前对于海上风机导管架基础的竖向承载能力特性研究仍存在不全面和结果不统一的问题。为此,采用有限元软件ABAQUS建立三桩导管架风机基础模型,采用位移控制法逐级施加竖向荷载,研究适合植入式嵌岩三桩导管架基础的竖向极限承载力评判标准并分析嵌岩深度和导管架刚度对基础竖向承载能力的影响。研究结果表明:岩层海床坚硬,对三桩导管架基础具有较好的承载作用,在承载过程中未发生塑性应变,可用基础上部法兰连接段钢结构达到屈服强度作为基础的竖向极限承载力的评判标准;竖向承载主要由桩端阻力和侧摩阻力组成,桩端阻力在承载中占比较大;提高嵌岩深度可以提高基础的竖向承载能力,并提高竖向极限承载力,提高侧摩阻力承载占比,过小的嵌岩深度会导致基础应力较大;提高导管架刚度可以有效减少基础局部应力,增大竖向承载能力,但对侧摩阻力影响较小。Jacket foundation has become the preferred foundation form for more and more offshore wind farms because of its large overall stiffness.In GuangXi'and other coastal areas where the geological conditions of seabed are bedrock,the wind turbine foundation is often built by implanting steel pipe piles after drilling and grouting treatment at the pile side.However,the research on the vertical bearing capacity characteristics of offshore wind turbine jacket foundation is still incomplete and the results are not uniform.In this paper,the finite element software ABAQUS is used to establish the model of three-pile jacket foundation,and the vertical load is applied step by step by displacement control method.The evaluation standard of vertical ultimate bearing capacity suitable for the embedded rock-socketed three-pile jacket foundation is studied and the influence of rock-socketed depth and jacket stiffness on the vertical bearing capacity of the foundation is analyzed.The results show that,(a)the seabed of rock stratum is hard,which has a good bearing effect on the three-pile jacket foundation,and no plastic strain occurs during the bearing process,so the yield strength of the steel structure in flange connection section of the upper part of foundation can be used as the criterion for judging the vertical ultimate bearing capacity of the foundation;(b)the vertical bearing capacity is mainly composed of pile tip resistance and side friction resistance,and the pile tip resistance accounts for a large proportion in the bearing capacity;(c)increasing the rock-socketed depth can improve the vertical bearing capacity of the foundation,the vertical ultimate bearing capacity and the bearing ratio of side friction,and too small rock-socketed depth will lead to greater foundation stress;and(d)increasing the stiffness of jacket can effectively reduce the local stress of foundation and increase the vertical bearing capacity,but it has little effect on the side friction.

关 键 词：海上风机 三桩导管架基础 竖向承载力 嵌岩深度 有限元分析 

分 类 号：TU391[建筑科学—结构工程]