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山东大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (5): 88-94.doi: 10.6040/j.issn.1672-3961.0.2016.153

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不同扩径体数量、位置对支盘桩承载力的影响

李连祥1,2,李先军1,2   

  1. 1.山东大学土建与水利学院, 山东 济南 250061;2.山东大学基坑与深基础工程技术研究中心, 山东 济南 250061
  • 收稿日期:2016-05-10 出版日期:2016-10-20 发布日期:2016-05-10
  • 作者简介:李连祥(1966— ),男,河北唐山人,教授,博士,主要研究方向为基坑与深基础工程. E-mail:jk_doctor@163.com
  • 基金资助:
    济南市科技计划基金资助项目(201201145)

Influence of squeezed branch pile bearing capacity on different numbers and positions of enlarged parts

LI Lianxiang1,2, LI Xianjun1,2   

  1. 1. School of Civil Engineering, Shandong University, Jinan 250061, Shandong, China;
    2. Engineering Research Center of Foundation Pit and Deep Foundation, Shandong University, Jinan 250061, Shandong, China
  • Received:2016-05-10 Online:2016-10-20 Published:2016-05-10

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摘要： 通过有限元模拟现场试验并以此设计34组对比模型,全面深入研究支盘桩承载性状,揭示内部工作机理。以相同扩径体数量的纵向对比,总结出侧阻力主要在前期发挥作用,端阻力主要在后期发挥作用,扩径体位置越深,支盘桩后期承载力越高,沉降曲线越缓;以不同扩径体数量的横向对比,发现承载力提高效率和扩径端阻力发挥效率的变化规律:扩径体数量设置过多,会使桩基承载力提高效率降低,扩径端阻力也不能正常发挥。为使经济性达到最优,建议最佳扩径体数量为2~3个,为工程设计提供参考。

关键词: 扩径体位置, 承载力净增长率, 扩径体, 扩径端阻力, 扩径体数量, ABAQUS

Abstract: The squeezed branch pile behavior and its internal working mechanism had been deeply investigated by simulating the field test and designing34 comparison models. According to vertical comparison on piles with the same number of enlarged parts, conclusions had been made that skin friction played a main role in the former stage but enlarged part resistance played later. A deeper enlarged part position could lead to a higher later-stage bearing capacity and a slower settlement curve. While lateral comparison on piles with different enlarged part number showed bearing capacity improving efficiency rule and enlarged part resistance efficiency rule: too many enlarged parts could reduce the bearing capacity improving efficiency and affect the performance of the enlarged parts. To achieve the best in economy, the suggested optimal number of enlarged parts was 2-3, which could provide reference for engineering.

Key words: enlarged part number, enlarged part resistance, ABAQUS, net growth rate of bearing capacity, enlarged part, enlarged part position

中图分类号: 

  • TU473
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