通过有限元计算不同载荷角度下单柱复合筒型基础承载能力以及冲刷效应对基础频率和刚度的影响分析,确定最不利的冲刷情况,然后针对在天津黏土覆盖情况下的单柱复合筒型基础的不同冲刷状态进行研究。改变土体的冲刷角度和冲刷工况会导致土体形态发生变化,同时对结构的极限承载力、弯矩和倾角规律产生不同程度的影响,随着冲刷深度从2 m增至10 m,基础的横向刚度将下降15%,频率将下降7%~8%。深层土的冲刷会降低结构承载力,但影响程度有限;完全冲刷对于结构承载力的降低大于单侧冲刷;循环荷载作用下,冲刷对于结构的效应明显增大。
Abstract
The mono-column composite bucket foundation is an innovative foundation structure developed in China and has been applied in several offshore wind power projects. However, the assessment of its bearing performance under scour conditions remains insufficiently understood. In this study, finite element analysis was first conducted to evaluate the bearing capacity of the mono-column composite bucket foundation under different loading directions and to examine the influence of scour on the natural frequency and stiffness of the foundation, thereby identifying the most unfavorable scour condition. The bearing behavior of the foundation under different scour conditions was then investigated under Tianjin clay-covered soil conditions. The research results indicate that variations in the loading direction relative to the scoured zone and in scour pattern alter the surrounding soil morphology and consequently affect the ultimate bearing capacity, bending moment, and inclination response of the structure to different degrees. As the scour depth increases from 2 m to 10 m, the lateral stiffness of the foundation decreases by about 15%, while its natural frequency decreases by 7%-8%. Scour extending into deeper soil layers reduces the structural bearing capacity, although the reduction is limited. Complete scour causes a greater decrease in bearing capacity than one-sided scour. Under cyclic loading, the adverse effect of scour on the structural response becomes more pronounced.
关键词
海上风电 /
冲刷 /
承载力 /
复合筒型基础 /
荷载-位移曲线 /
频率和刚度
Key words
offshore wind power /
scour /
bearing capacity /
composite bucket foundation /
load-displacement curve /
frequency and stiffness
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参考文献
[1] 詹懿德, 沈佳轶, 陈家旺, 等. 考虑冲刷的单桩水平极限承载力预测模型研究[J]. 地下空间与工程学报, 2022, 18(增刊2): 596-602.
Zhan Y D, Shen J Y, Chen J W, et al.Study on prediction model of ultimate lateral bearing capacity of monopile considering scour[J]. Chinese Journal of Underground Space and Engineering, 2022, 18(S2): 596-602.
[2] 王守峰, 戚振亚, 许卫东. 海上风电桩基冲刷计算研究[J]. 绿色科技, 2022, 24(20): 273-275.
Wang S F, Qi Z Y, Xu W D.Research on scour calculation of offshore wind power pile foundation[J]. Journal of Green Science and Technology, 2022, 24(20): 273-275.
[3] 柴威,何林,施伟,等. 海上风力机响应极值预报研究进展综述[J]. 太阳能学报,2026,47(3): 308-315.
Chai W, He L, Shi W, et al.Review on research progress in extreme response prediction of offshore wind turbines[J]. Acta Energiae Solaris Sinica, 2026, 47(3): 308-315.
[4] 丁红岩, 贾楠, 张浦阳, 等. 海上风电复合筒型基础粉质黏土下沉试验分析[J]. 天津大学学报(自然科学与工程技术版), 2017, 50(9): 893-899.
Ding H Y, Jia N, Zhang P Y, et al.Analysis of penetration test of composite bucket foundations for offshore wind turbines in silty clay[J]. Journal of Tianjin University(Science and Technology), 2017, 50(9): 893-899.
[5] 乐丛欢, 丁红岩, 张浦阳. 分舱板对海上风机混凝土筒型基础承载模式的影响[J]. 工程力学, 2013, 30(4): 429-434.
Le C H, Ding H Y, Zhang P Y.Influences of bulkheads on the bearing mode of concrete bucket foundation for offshore wind turbine[J]. Engineering Mechanics, 2013, 30(4): 429-434.
[6] 校建东, 张权, 林毅峰, 等. 一种用于单柱和复合筒组合基础的连接工装: CN110607802B[P].2024-07-30.
Xiao J D, Zhang Q, Lin Y F, et al. A connecting tool for mono-column and composite bucket combined foundations: CN110607802B[P].2024-07-30.
[7] 校建东, 乐丛欢, 林毅峰, 等. 一种单柱复合筒型基础结构及其施工方法:CN114809064A[P].2022-07-29.
Xiao J D, Le C H, Lin Y F, et al. A single-column composite bucket foundation structure and construction method: CN114809064A[P].2022-07-29.
[8] 乐丛欢, 校建东, 林毅峰, 等. 一种多分舱复合筒型基础及其施工方法: CN114809063A[P].2022-07-29.
Le C H, Xiao J D, Lin Y F, et al. A multi-compartment composite bucket foundation and construction method: CN114809063A[P].2022-07-29.
[9] 刘俊峰, 倪道俊, 校建东, 等. 海上风电单柱复合筒型基础沉放过程分析[J]. 太阳能学报, 2023, 44(3): 239-243.
Liu J F, Ni D J, Xiao J D, et al.Analysis of penetrating process of single-column composite bucket foundation for offshore wind turbine[J]. Acta Energiae Solaris Sinica, 2023, 44(3): 239-243.
[10] 张浦阳, 冯嘉成, 李响亮, 等. 土质对三筒吸力桩导管架基础水平承载特性的影响[J]. 太阳能学报, 2023, 44(4): 189-194.
Zhang P Y, Feng J C, Li X L, et al.Influence of different soil on horizontal bearing characteristics of tripod suction jucket foundations[J]. Acta Energiae Solaris Sinica, 2023, 44(4): 189-194.
基金
中国长江三峡集团有限公司科研项目（44006590）
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