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浙江大学学报(工学版)
浙江大学学报(工学版)  2024, Vol. 58 Issue (3): 570-578    DOI: 10.3785/j.issn.1008-973X.2024.03.014
土木工程、交通工程     
软基中多向受荷大直径单桩桩土相互作用试验研究
戴朴修1(),刘开富2,*(),谢新宇1,3,徐越栋2
1. 浙江大学 滨海和城市岩土工程研究中心，浙江 杭州 310058
2. 浙江理工大学 建筑工程学院，浙江 杭州 310018
3. 浙江大学 温州研究院，浙江 温州 325035
Experimental investigation on pile-soil interaction of monopile under multidirectional load in soft foundation
Puxiu DAI1(),Kaifu LIU2,*(),Xinyu XIE1,3,Yuedong XU2
1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
2. School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou 310018, China
3. Institute of Wenzhou, Zhejiang University, Wenzhou 325035, China
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摘要：

为了研究多向循环受荷大直径单桩的水平变形响应及桩土相互作用机理，开展多向受荷大直径单桩的1g大比尺模型试验，探讨不同竖向和水平循环荷载比下的桩侧受力及变形响应. 试验结果表明，施加竖向循环荷载会增大桩身水平位移的发展速率；最大弯矩出现在2.0倍桩径深度处，随着循环次数的增大，桩身弯矩表现出减小的趋势；在循环荷载作用下，最大土抗力所在的位置随着循环次数的增大逐渐从1.5倍桩径深度处向2.0倍桩径深度处移动，循环土体抗力-桩身水平变形（p-y）曲线的退化主要发生在表层土体；施加竖向循环荷载会增大桩土界面的初始刚度，但同时也会加速桩土体系的刚度退化. 建议在海上风电大直径单桩的设计中，特别注意竖向循环荷载对长期循环荷载作用下桩身位移及桩土相互作用的不利影响.
关键词： 1g模型试验;  大直径单桩;  复杂荷载;  p-y曲线;  桩土相互作用    
Abstract:

A 1g large-scale model test was carried out, in order to further study the lateral deformation response and pile-soil interaction mechanism of large-diameter monopile under multidirectional cyclic load. The lateral stress and the deformation response of the pile under different vertical and lateral cyclic load ratios were discussed. Test results showed that applying vertical cyclic loads would increase the development rate of lateral displacement of the monopile. The maximum bending moment appeared at the depth of 2.0 times the pile diameter, and the bending moment of the pile body showed a decreasing trend with the increase of the number of cycles. The position of the maximum soil resistance gradually moved from 1.5 times the pile diameter depth to 2.0 times the pile diameter depth under cyclic load, and the degradation of cyclic soil resistance-pile lateral deformation (p-y) curve mainly occured in the surface soil. Applying vertical cyclic load would increase the initial stiffness of the pile-soil interface, but it would also accelerate the stiffness degradation of the pile-soil system. Special attention should be paid to the adverse effects of vertical cyclic load on pile displacement and pile-soil interaction under long-term cyclic load in the design of large-diameter monopile for offshore wind turbines.
Key words: 1g model test    monopile    complex loading    p-y curve    pile-soil interaction
收稿日期: 2023-03-01 出版日期: 2024-03-05
CLC:  TU 43  
基金资助: 国家自然科学基金资助项目(52078465)；浙江省公益技术应用研究资助项目(LGG22E080015).
通讯作者: 刘开富     E-mail: daipuxiu@zju.edu.cn;liukaifu@zstu.edu.cn
作者简介: 戴朴修（1998—），男，硕士生，从事海上风电大直径单桩研究. orcid.org/0009-0002-7098-3009. E-mail：daipuxiu@zju.edu.cn
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引用本文:

戴朴修,刘开富,谢新宇,徐越栋. 软基中多向受荷大直径单桩桩土相互作用试验研究[J]. 浙江大学学报(工学版), 2024, 58(3): 570-578.

Puxiu DAI,Kaifu LIU,Xinyu XIE,Yuedong XU. Experimental investigation on pile-soil interaction of monopile under multidirectional load in soft foundation. Journal of ZheJiang University (Engineering Science), 2024, 58(3): 570-578.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2024.03.014    或    https://www.zjujournals.com/eng/CN/Y2024/V58/I3/570

土体类型w/%$ \gamma $/(kN·m?3)e$ c $/kPa$ \varphi $/(°)$ {w_{\text{L}}} $/%$ {w_{\text{P}}} $/%$ {I_{\text{L}}} $$ {I_{\text{P}}} $
粉砂11.017.50.71—33.0————
淤泥质黏土44.018.61.1311.427.445.124.60.9520.5
表 1  试验土物理参数
图 1  淤泥质黏土不排水抗剪强度随深度变化曲线
图 2  岩土工程灾变模拟系统
图 3  模型桩布置及测试图
图 4  静载及多向循环加载模型试验布置
图 5  循环荷载示意图
荷载类别试验编号$ \mu $$ \eta $$ \lambda $N
静力S1————
S2————
循环C1-10.300.210000
C1-20.300.310000
C1-30.300.410000
C2-10.30.10.210000
C2-20.30.10.310000
C2-30.30.10.410000
表 2  静载及多向循环加载试验方案
图 6  循环试验荷载-位移曲线
图 7  循环试验位移曲线
图 8  循环试验归一化位移曲线
图 9  不同循环次数下的桩身弯矩分布曲线
图 10  不同循环荷载比下的桩身弯矩对比分析(N=10000)
图 11  桩身最大弯矩归一化分析
图 12  不同循环次数下桩侧土抗力分布曲线
图 13  不同循环荷载比下的桩身土抗力对比分析(N=10000)
图 14  2.0D深度处的循环p-y曲线($ \lambda $=0.2)
图 15  不同深度处实测静力p-y曲线峰值、循环p-y曲线峰值与API推荐值对比
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