| 黏土中超大直径钢管桩内侧摩阻力研究 |
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| 引用本文： | 刘润,尹瑞龙,梁超,陈广思.黏土中超大直径钢管桩内侧摩阻力研究[J].岩土力学,2023,44(1):232-240. |
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| 作者姓名： | 刘润 尹瑞龙 梁超 陈广思 |
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| 作者单位： | 天津大学 水利工程仿真与安全国家重点实验室，天津 300072 |
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| 基金项目： | 国家杰出青年科学基金（No. 51825904） |
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| 摘 要： | 随着当前海上风电装机容量逐渐增加，超大直径钢管桩基础得到了广泛应用。桩径的增加改变了桩-土相互作用模式，现行规范中钢管桩内侧摩阻力计算方法的适用性有待商榷。通过离心模型试验，采用双壁板桩和管桩模型揭示了黏土中有限范围土压力与不同桩径的内侧摩阻力发挥规律；采用有限元数值分析方法，开展了内侧摩阻力发挥规律的影响因素分析，建立了钢管桩内侧摩阻力计算方法，并与离心机试验结果进行了对比验证。结果表明：随着桩径增大，桩内壁土压力增大，内侧摩阻力也随之增大，并沿桩深呈指数型分布，其发挥范围为距桩端5倍桩径以内；提出的钢管桩内壁侧摩阻力计算方法与离心机试验结果吻合良好。
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| 关 键 词： | 黏土 超大直径钢管桩 内侧摩阻力 离心机试验 |
| 收稿时间： | 2022-03-08 |
Inner frictional resistance of super-large diameter steel pipe pile in clay |
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| LIU Run,YIN Rui-long,LIANG Chao,CHEN Guang-si.Inner frictional resistance of super-large diameter steel pipe pile in clay[J].Rock and Soil Mechanics,2023,44(1):232-240. |
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| Authors: | LIU Run YIN Rui-long LIANG Chao CHEN Guang-si |
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| Institution: | State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China |
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| Abstract: | With the increasing of current installed capacity of offshore wind power, super-large diameter steel pipe pile foundation has been widely used. The increase of pile diameter changes the pile-soil interaction mode, thus the applicability of the method for calculating inner frictional resistance of steel pipe piles in the current code is open to question. In this study, centrifugal model tests are carried out to reveal the behavior of earth pressure and internal frictional resistance in clay with different pile diameters by using double-walled pile and pipe pile models. By using finite element numerical analysis method, the factors influencing the inner frictional resistance are analyzed, and a method for calculation of inner frictional resistance of steel pipe piles is developed. The proposed method is verified by comparison with the centrifuge test results. The results show that, with the increase of pile diameter, the inner wall earth pressure increases, and the inner frictional resistance also increases. The inner frictional resistance is exponentially distributed along the pile depth, and it is available within 5 times the pile diameter from the pile tip. The proposed calculation method of inner wall frictional resistance is found to be in good agreement with centrifuge test results. |
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| Keywords: | clay super-large diameter steel pipe pile inner frictional resistance centrifuge test |
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