大连海域大直径单桩基础冲刷特征及其水平承载特性分析  

Analysis of Horizontal Bearing Capacity of Large Diameter Single Pile in Offshore Wind Power under Scour Action

作　　者：许维强 葛畅 吴永华 周菊敏 沈佳轶[3] Xu Weiqiang;Ge Chang;Wu Yonghua;Zhou Jumin;Shen Jiayi(Hydro-china Huadong Engineering Co.,Ltd,Hangzhou 311122,China;Zhejiang East China Engineering Consulting Co.Ltd,Hangzhou 311122,China;Ocean College Zhoushan,Zhejiang University,Zhoushan Zhejiang 316021,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,杭州311100 [2]浙江华东工程咨询有限公司,杭州311100 [3]浙江大学海洋学院,浙江舟山316021

出　　处：《科技通报》2022年第10期74-78,共5页Bulletin of Science and Technology

基　　金：中国电建集团华东勘测设计研究院有限公司科技项目(KY2020-ZX-16);浙江省联合基金重点项目(LHZ22E090002)。

摘　　要：海上风电工程中,大直径单桩基础应用越来越广泛,冲刷作用会导致桩基水平承载力受到影响,因此研究海上风电大直径单桩在冲刷作用下的水平承载力非常重要。采用现场勘察和数值模拟相结合的方法对大直径单桩基础局部冲刷及其承载力特性开展研究,得到以下主要结论:(1)根据多波束测深系统现场扫海显示,距桩基中心位置半径21 m范围内,最大冲刷坑深度为1.47 m;(2)Flow3D冲刷数值模拟得到的最大冲刷坑深度为1.30 m,与实测值1.47 m接近;(3)ABAQUS数值分析显示,有冲刷和无冲刷情况下的桩基极限水平承载力分别为39500 kN和39000 kN,该海域风机基础水平承载力受冲刷作用影响程度较小。In offshore wind power engineering,large-diameter single pile foundation is increasingly widely used.Scour action will affect the horizontal bearing capacity of pile foundation.Therefore,it is very important to study the horizontal bearing capacity of large-diameter single pile in offshore wind power under scour action.Local scour and bearing capacity characteristics of large diameter single pile foundation were studied by combining field investigation and numerical simulation,and the main conclusions were as follows:According to the sea sweeping situation using the multi-beam bathymetry system in the engineering site,the maximum scour pit depth was 1.47 m within the radius of 21 m from the center of pile foundation;(2)The maximum scour pit depth obtained by Flow3 D numerical simulation is 1.30 m,which is close to the measured value of 1.47 m;(3)ABAQUS numerical analysis shows that the ultimate horizontal bearing capacity of pile foundation with and without scour is 39500 kN and 39000 kN respectively,and the horizontal bearing capacity of fan foundation in this sea area is less affected by scour.

关 键 词：海上风电 大直径单桩 局部冲刷 Flow3D ABAQUS 水平承载力 

分 类 号：TE832[石油与天然气工程—油气储运工程]