采用三维非线性有限元方法对水平荷载作用下桩桶复合基础力学响应进行比较系统的数值分析。首先对已有的离心模型试验进行数值模拟,计算结果与相关试验数据较吻合;进而探讨桶体尺寸、砂土强度参数与水平荷载偏心距等对于桩桶复合基础水平承载力的影响,揭示砂土地基中桩桶复合基础的失稳模式与荷载分担机制。结果表明：桩桶复合基础的破坏模式主要为旋转失稳,基础水平承载力随桶体直径的增加而增加,桶高超过桩径的1.5倍后,水平承载力随桶高的增加而增加的趋势不再明显。在荷载承担方面,弯矩分量主要由桩构件分担,水平力主要由桶构件分担,并且砂土地基越密实越有利于桶构件发挥其抵抗水平力的能力。通过对数值模拟结果进行数据拟合,提出一个能够系统考虑桶体尺寸、砂土强度参数与荷载偏心距的水平承载力预测公式。
Abstract
The mechanical response of pile-bucket hybrid foundations subjected to horizontal loading is systematically investigated using three-dimensional nonlinear finite element analyses. Firstly, the existing centrifuge model test is numerically simulated, and the calculated results are in good agreement with the relevant experimental data. Then the effects of bucket size, soil strength parameters and horizontal load eccentricity on the horizontal bearing capacity of pile-bucket hybrid foundations are analyzed, revealing the failure mode and load-sharing mechanism of pile-bucket hybrid foundations in sand. The results indicate that the failure mode of the pile-bucket hybrid foundation is mainly rotational instability. The horizontal bearing capacity of the foundation increases with the increase of the bucket diameter. The trend of increasing horizontal bearing capacity with the increase of bucket height becomes less obvious when the bucket height exceeds 1.5 times the pile diameter. In the pile-bucket hybrid foundation, the bucket component primarily bears the horizontal force, while the pile component mainly withstands the bending moment. It is more advantageous to exert the horizontal resistance capacity of the bucket component in denser sand. Through data fitting of numerical simulation results, a lateral bearing capacity prediction formula is proposed that incorporates bucket dimensions, sand strength parameters, and load eccentricity.
关键词
海上风电 /
承载力 /
数值分析 /
桩桶复合基础 /
砂土 /
荷载分担机制 /
破坏模式
Key words
offshore wind power /
bearing capacity /
numerical analysis /
pile-bucket hybrid foundation /
sand /
load sharing mechanism /
failure mode
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基金
山东省自然科学基金（ZR2019MEE010）; 烟台市科技创新发展计划（2021XDHZ071）; 鲁东大学研究生创新项目（IPGS2024-081）
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