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浙江大学学报(工学版)
浙江大学学报(工学版)  2026, Vol. 60 Issue (3): 495-503    DOI: 10.3785/j.issn.1008-973X.2026.03.005
交通工程、土木工程     
砂土地基中吸力桶基础的复合承载特性
陈政宇1,2(),张陈蓉1,2,*(),时振昊1,2,郝宸1,2
1. 同济大学 地下建筑与工程系，上海 200092
2. 同济大学 岩土及地下工程教育部重点实验室，上海 200092
Combined bearing behavior of suction bucket foundation in sand
Zhengyu CHEN1,2(),Chenrong ZHANG1,2,*(),Zhenhao SHI1,2,Chen HAO1,2
1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China
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摘要：

针对砂土地基中海上风机吸力桶基础的复合承载问题开展研究. 采用状态相关砂土弹塑性模型，基于ABAQUS有限元软件UMAT子程序开展数值模拟. 通过土单元试验的模拟，验证了模型的合理性. 对砂土中吸力桶基础的承载特性进行模拟，将计算结果与遵循Mohr-Coulomb屈服准则理想弹塑性土体模型(MC模型)的计算结果进行对比，分析砂土中吸力桶基础复合加载下破坏包络面的区别. 结果表明，砂土状态相关的模型能够合理地反映吸力桶基础的承载特性，采用MC模型得到的吸力桶基础在二维及三维荷载空间的复合承载性能在大部分情况下更保守. 吸力桶基础在三维荷载组合作用下，在桶顶施加一定的竖向荷载有利于提高基础的水平-力矩复合承载力，但效果有限.
关键词： 砂土;  吸力桶基础;  状态相关模型;  砂土模型    
Abstract:

The combined bearing capacity of suction bucket foundations for offshore wind turbines in sandy soil was analyzed. A state-dependent elastoplastic model for sand was employed, and numerical simulations were conducted by using the UMAT subroutine in ABAQUS finite element software. The model’s validity was verified through simulations of soil element tests. Simulations were performed on the bearing behavior of suction bucket foundations in sandy soil. The computation results were compared with those obtained from an ideal elastic-plastic soil model following the Mohr-Coulomb yield criterion (MC model). Differences in the failure envelope surfaces under combined loading of the suction bucket foundation in sand were analyzed. Results show that the state-dependent sand model can reasonably reflect the bearing characteristics of the suction bucket foundation. The combined bearing capacity of the suction bucket foundation in two-dimensional and three-dimensional load spaces, which is obtained using the MC model, is generally more conservative in most cases. Applying a certain vertical load at the top of the bucket can improve the horizontal-moment composite bearing capacity of the foundation under three-dimensional combined loading, but the effect is limited.
Key words: sand    suction bucket foundation    state-dependent model    sand model
收稿日期: 2025-05-20 出版日期: 2026-02-04
:  TM 614  
基金资助: 国家自然科学基金资助项目（51779175）.
通讯作者: 张陈蓉     E-mail: 2232578@tongji.edu.cn;zcrong33@tongji.edu.cn
作者简介: 陈政宇（2001—），男，硕士生，从事岩土工程的研究. orcid.org/0009-0001-9550-0897. E-mail：2232578@tongji.edu.cn
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陈政宇
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引用本文:

陈政宇,张陈蓉,时振昊,郝宸. 砂土地基中吸力桶基础的复合承载特性[J]. 浙江大学学报(工学版), 2026, 60(3): 495-503.

Zhengyu CHEN,Chenrong ZHANG,Zhenhao SHI,Chen HAO. Combined bearing behavior of suction bucket foundation in sand. Journal of ZheJiang University (Engineering Science), 2026, 60(3): 495-503.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2026.03.005    或    https://www.zjujournals.com/eng/CN/Y2026/V60/I3/495

图 1  临界状态线与状态参数
参数数值参数数值
$ {G}_{{\mathrm{e}}}^{{\mathrm{ref}}} $/MPa125ξ0.7
v0.05d00.88
$ {M}_{{\mathrm{c}}} $1.25m3.5
$ {M}_{{\mathrm{e}}} $0.9375h13.15
$ {e}_{\Gamma} $0.934h23.05
λ0.019n1.1
表 1  状态相关砂土模型的参数
图 2  不排水三轴试验结果的对比
弹性参数摩擦角剪胀角其他参数
E1 = 86.54 MPaφ1 = 32.38°θ1 = 5.13°φc = 31.15°
E2 = 117.60 MPaφ2 = 32.04°θ2 = 4.09°c = 0.1 kPa
E3 = 142.02 MPaφ3 = 31.78°θ3 = 3.19°e0 = 0.833
E4 = 162.82 MPaφ4 = 31.56°θ4 = 2.37°emin = 0.597
E5 = 181.24 MPaφ5 = 31.39°θ5 = 1.61°emax = 0.977
ν = 0.05———
ρ = 2.446———
表 2  MC砂土模型的参数(Dr = 37.9%)
弹性参数摩擦角剪胀角其他参数
E1 = 100.01 MPaφ1 = 35.20°θ1 = 11.99°φc = 31.15°
E2 = 135.90 MPaφ2 = 34.71°θ2 = 10.95°c = 0.1
E3 = 164.12 MPaφ3 = 34.31°θ3 = 10.05°e0 = 0.735
E4 = 188.15 MPaφ4 = 33.96°θ4 = 9.23°emin = 0.597
E5 = 209.45 MPaφ5 = 33.64°θ5 = 8.47°emax = 0.977
ν = 0.05———
ρ = 2.446———
表 3  MC砂土模型的参数(Dr = 63.7%)
图 3  网格、地应力平衡与网格无关性的验证
图 4  力矩-转角曲线的对比(Dr = 60%)
图 5  荷载-位移曲线的对比
图 6  水平极限荷载下的应力云图(Dr = 37.9%)
图 7  切线相交法
图 8  V-H平面内无量纲化破坏包络线的对比
图 9  V-M平面内无量纲化破坏包络线的对比
图 10  H-M平面内无量纲化破坏包络线的对比
图 11  V对基础H-M破坏包络面的影响(V≤0.5Vult)
图 12  V-H-M荷载作用下吸力桶基础的破坏包络面(V≤0.5Vult)
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