减小负摩阻力履带桩的研发及力学特性分析

doi:10.13722/j.cnki.jrme.2022.0784

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摘要针对湿陷性黄土地区的桩基负摩阻力问题，提出一种既可以减小桩侧负摩阻力，又能增加正摩阻力的履带桩。对其构造和工作原理进行探讨。基于已有研究的荷载传递函数，结合履带的运动特性对荷载传递法进行修正，推导出适用于新型桩的桩侧正摩阻力以及负摩阻力分布函数，以及桩体沉降和考虑时间效应的土体沉降计算公式，最终给出该新型桩的单桩竖向极限承载力计算方法。结合算例，采用非线性有限元软件ABAQUS模拟该新型桩的结构特性、工作原理，并将模拟值与理论值进行对比分析。进行新型桩与普通桩的室内模型试验。结果表明：(1) 履带的设置可以使中性点上移，减小桩侧负摩阻力；(2) 履带桩能够使桩侧土体竖向位移减小，随着距桩中心的距离增加，沉降量越小，更有利于地基的稳定性；(3) 单桩承载力模拟结果与理论计算所得结果基本一致，验证了理论分析方法的正确性；(4) 与普通直桩相比，减小负摩阻力效果明显，单桩承载力得到提高，为湿陷性黄土地区桩基工程的设计提供一定的理论指导。

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	董建华1
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	郑亚林1
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	吴晓磊1
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关键词 ：桩基础, 履带桩, 复合地基, 荷载传递法, 固结效应, 负摩阻力

Abstract：Aiming at the problem of negative friction of pile foundation in collapsible loess area，a kind of crawler steel pipe pile is proposed，which can not only reduce the negative friction of pile side，but also increase the positive friction. Its structure and working principle are discussed. Based on the load transfer function and combined with the motion characteristics of the track，the load transfer method is modified according to the motion characteristics of the track，and the distribution functions of the positive and negative friction on the side of the pile，as well as the calculation formulas of the pile settlement and the soil settlement considering the time effect are derived，Finally，the calculation method of the vertical ultimate bearing capacity of the new pile is given. Combined with an example，the structural characteristics and working principle of the new pile are simulated by using the nonlinear finite element software ABAQUS，and the simulated value is compared with the theoretical value. The indoor model test of new type pile and common pile is carried out. The results show that：(1) The track can make the neutral point move up and reduce the negative friction on the pile side. (2) With the increase of the distance from the pile center，the smaller the settlement is，which is more conducive to the stability of the foundation. (3) The simulation results of single pile bearing capacity are basically consistent with the theoretical calculation results，which verifies the correctness of the theoretical analysis method. (4) Compared with the ordinary straight pile，the effect of reducing negative friction is obvious，and the bearing capacity of single pile is improved，which provides certain theoretical guidance for the design of pile foundation projects in collapsible loess areas.

Key words： pile foundation caterpillar pile composite foundation load transmission method consolidation effect negative friction

引用本文:

董建华1，2，郑亚林1，2，吴晓磊1，2. 减小负摩阻力履带桩的研发及力学特性分析[J]. 岩石力学与工程学报, 2023, 42(6): 1520-1533.
DONG Jianhua1，2，ZHENG Yalin1，2，WU Xiaolei1，2. Study and development of caterpillar pile for reducing negative friction resistance and analysis of its mechanical properties. , 2023, 42(6): 1520-1533.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0784 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I6/1520

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