| 引用本文: | 邹新军,王奕康,周密.上硬下软地层中桩盘复合基础VH承载特性[J].哈尔滨工业大学学报,2022,54(2):145.DOI:10.11918/202012048 |
| ZOU Xinjun,WANG Yikang,ZHOU Mi.Bearing behavior of monopile-friction wheel hybrid foundation under V-H loading in stiff-over-soft soil deposits[J].Journal of Harbin Institute of Technology,2022,54(2):145.DOI:10.11918/202012048 |
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| 摘要: |
| 海上风机基础正常工作条件下要承受上部结构传递的水平荷载H、倾覆力矩M及竖向荷载V,单桩-摩擦盘复合基础（桩盘复合基础）结合了单桩基础和重力式基础的承载优势, 是一种新型的海上风机基础形式。为研究桩盘复合基础在组合力下的承载特性,基于自行设计的V-H组合加载装置,完成一系列桩盘复合基础室内载荷模型实验,获得了上硬下软地层中V-H共同作用时桩盘复合基础的水平荷载-位移曲线及桩身弯矩分布。经无量纲化处理和拟合,得到组合力下桩盘复合基础承载力包络线及计算公式。之后在模型试验的基础上建立多组数值模型,并通过数值模拟对桩盘复合基础的组合受力特性进行参数分析。结果表明:桩盘复合基础在上硬下软地层中V-H荷载空间的承载特性明显优于单桩基础；V-H组合作用时,预先施加的V在达到（0.5~0.6）Vu时,其对基础的水平及弯矩承载力提高作用最明显。实际工程中,可根据海上风机受力特点与破坏包络线的关系进行基础设计,由本研究拟合得到的承载力计算公式可评估桩盘复合基础的承载能力。 |
| 关键词: 桩盘复合基础 联合受荷 破坏包络面 |
| DOI：10.11918/202012048 |
| 分类号:TU47 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(1,9) |
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| Bearing behavior of monopile-friction wheel hybrid foundation under V-H loading in stiff-over-soft soil deposits |
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ZOU Xinjun1,2,WANG Yikang1,ZHOU Mi3
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(1.College of Civil Engineering, Hunan University, Changsha 410082, China; 2.Key Laboratory of Building Safety and Energy Efficiency (Hunan University), Ministry of Education, Changsha 410082, China; 3.State Key Laboratory of Subtropical Building Science (South China University of Technology), Guangzhou 510640, China)
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| Abstract: |
| The foundations of offshore wind turbines are often subjected to horizontal load (H), bending moment (M), and vertical load (V). The monopile-friction wheel hybrid foundation is an innovative type of foundation for offshore wind turbine, which combines the advantages of both monopile foundation and gravity foundation. In order to investigate the bearing characteristics of the monopile-friction wheel hybrid foundation under combinedloading conditions, a series of model tests were conducted based on the in-house designed experimental equipment. The horizontal load-displacement curves and the bending moment distributions of the pile shaft were determined under different V-H loading conditions in stiff-over-soft soil deposits through model tests. By dimensionless treatment and fitting process, the envelopes of bearing capacity and the corresponding simplified formula were obtained. Then, based on the model tests, several groups of numerical models were established, and numerical simulations were conducted for parametric analysis. Results show that the bearing performance of the monopile-friction wheel hybrid foundation underV-H loading conditions was significantly improved compared with that of the monopile foundation in stiff-over-soft soil deposits. The pre-applied V had the most obvious enhancement effect on the horizontal and bending moment bearing capacities of the foundation when it reached about (0.5-0.6)Vu under V-H combined loadings. In engineering practice, the relationship between the loading conditions and the computed failure envelopes can provide guidance for foundation design, and the bearing performance of monopile-friction wheel hybrid foundation can be evaluated through the empirical formula proposed in this study. |
| Key words: monopile-friction wheel hybrid foundation combined loading failure envelope |
