异形桩桩土荷载传递机理理论分析

吕亚茹; 刘汉龙; 王明洋; 李平

doi:10.11779/CJGE2015S1040

异形桩桩土荷载传递机理理论分析 English Version

吕亚茹^{1, 2},
刘汉龙^{2, 3},
王明洋¹,
李平²

1. 解放军理工大学爆炸冲击防灾减灾国家重点实验室,江苏南京 210007; 2. 河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京 210098; 3. 重庆大学土木工程学院,重庆 400044

基金项目: 国家自然科学基金项目（51408607,51408187）; 中央高校; 基本科研业务费专项资金项目（2013B01214）

详细信息

作者简介:
吕亚茹(1987- ),女,博士,主要从事软土地基加固方面的科学研究。

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出版历程
- 收稿日期: 2015-03-25
- 发布日期: 2015-07-24

Theoretical analyses of load transfer mechanism for special pile foundations

1. State Key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact, PLA University of Science and Technology, Nanjing 210007, China; 2. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098; 3. College of Civil Engineering, Chongqing University, Chongqing 400045, China

摘要

摘要: 近年来,异形桩成为国内外学者研究的热点之一。所谓的异形桩有两种,第一是通过改变桩身纵向截面形状得到变截面异形桩,第二是通过改变桩截面几何形状得到异形截面桩,其共同目的是通过改变桩身形状来提高桩基承载力。然而,目前的研究仍着眼于异形桩的宏观承载特性上,其复杂的桩土荷载传递机理即异形效应并未得到根本的揭示。通过平衡分析方法得到了考虑桩土剪切作用的单桩荷载传递计算方法,包括桩周土竖向有效应力、桩侧正（负）摩阻力、桩身总侧摩阻力和桩身轴力（下拽力）的计算公式。通过模型试验验证了公式的合理性。通过对比分析等截面面积的圆形桩、H形桩和X形桩,揭示了桩土剪切作用在异形截面桩中的表现,初步探讨了异形截面桩的异形效应。
- 异形桩 /
- 荷载传递机理 /
- 桩土剪切作用 /
- 异形效应 /
- 平衡分析
Abstract: In recent years, the special piles have been focused at home and abroad, including the piles with non-uniform cross-sectional area along shafts and those with special geometrical cross-sections. The load bearing capacity is enhanced for special piles by means of altering the pile geometry. Since many previous studies mainly emphasize on the bearing capacity, the complex fundamental load transfer mechanisms between special piles and their surrounding soil, called geometrical effects, are not well investigated and fully understood. Theoretical solutions are derive through equilibrium analyses for calculating the effective vertical stress, the unit positive (negative) shaft resistance, the total shaft resistance and the axial force (dragload). Those solutions are calibrated by reported large-scale model tests. The vertical shearing mechanisms of special piles are investigated by comparing a circular pile, an H-pile and an X-shaped pile with the same cross-sectional area. The geometrical effects are preliminarily discussed.
- special pile /
- load transfer mechanism /
- vertical shearing mechanism /
- geometrical effect /
- equilibrium analysis

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参考文献(16)

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