非均质成层地基海上风电单桩基础轴向承载特性研究  

Study on Axial Bearing Characteristics of Offshore Wind Turbine Monopile in Heterogeneous Layered Foundation

作　　者：王玉斌 苏浩然 陆界屹 苏凯[2,3,4] WANG Yu-bin;SU Hao-ran;LU Jie-yi;SU Kai(Clean Energy Branch of Huaneng International Jiangsu Energy Development Co,LTD,Nanjing 210000,Jiangsu Province,China;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,Hubei Province,China;Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering,Ministry of Education,Wuhan University,Wuhan 430072,Hubei Province,China;Hubei Provincial Key Laboratory of Water System Science for Sponge City Construction,Wuhan University,Wuhan 430072,Hubei Province,China)

机构地区：[1]华能国际江苏能源开发有限公司清洁能源分公司,江苏南京210000 [2]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [3]武汉大学水工岩石力学教育部重点实验室,湖北武汉430072 [4]武汉大学海绵城市建设水系统湖北省重点实验室,湖北武汉430072

出　　处：《中国农村水利水电》2023年第2期204-210,共7页China Rural Water and Hydropower

摘　　要：依托某海上风电项目,通过数值方法研究非均质成层地基环境下单桩轴向承载性能影响因素,并提出优化建议。结果表明,桩身轴力从桩顶至泥面缓慢增长,泥面以下桩身轴力随埋深增加而显著减少;轴向承载力各分量占比随桩顶荷载增长而逐渐变化,内外侧摩阻力随着桩顶荷载的增加存在“错位发挥”趋势;桩外侧摩阻力在空间上随深度增长较为均匀,而桩内侧摩阻力主要集中在单桩下部发挥作用。桩径及埋深对轴向承载力有着较大影响。桩身磨砂可以较为有效地提高桩轴向承载性能尤其是外侧摩阻力,同时还能减小磨砂部分桩身轴力。实际工程中应综合考虑多种因素确定桩径及埋深,也可对单桩靠近桩端部分的外表面采取磨砂处理以提高单桩轴向承载性能。Based on a practical offshore wind power project, the influence factors of axial bearing performance of monopile in heterogeneous layered foundation are studied by numerical method and optimization suggestions are put forward. The results show that the axial force of pile increases slowly from the pile top to the mud surface, and decreases significantly with the increase of buried depth under mud surface. The proportion of each component of axial bearing capacity changes gradually with the increase of load applied to pile top, and the internal and external side friction resistance shows a trend of "dislocation play" with the increase of load applied to pile top. The external side friction increases evenly with the increase of pile depth in space, while the internal side friction mainly is mobilized in the lower part of monopile. Pile diameter and buried depth have great influence on axial bearing capacity. The grinding of pile body can effectively improve the axial bearing capacity of pile, especially the external side friction resistance, and reduce the axial force of pile body with grinding. In practical engineering, pile diameter and buried depth should be determined by comprehensive consideration of various factors, and the external surface of monopile near the pile end can be treated with grinding to improve the axial bearing capacity of the monopile.

关 键 词：海上风电 非均质成层地基 轴向承载特性 侧摩阻力 

分 类 号：TU391[建筑科学—结构工程]