土工基础

›› 2019, Vol. 33 ›› Issue (1): 78-82.

• 工程实录 • 上一篇    下一篇

砂土类地基中螺纹灌注桩竖向抗拔性能模型试验研究

段自侠,雷 真，屈俊童，字晓雷，屈林河,张永钊   

  1. (云南大学 建筑与规划学院,昆明 650500)
  • 收稿日期:2018-04-23 修回日期:2018-05-10 出版日期:2019-03-02 发布日期:2019-03-08
  • 作者简介:段自侠（1990-），男，硕士研究生，研究方向为岩土工程。
  • 基金资助:

    云南省应用基础研究青年计划（2015FD005）；云南大学“东陆中青年骨干教师”培养计划；昆明市科学基金项目（2015—1—G—01089）。

Model Study on the Uplift Capacity of Vertical Threaded Steel Pile in Sandy Soils

DUAN Zixia, LEIZhen, QU Juntong, ZI Xiaolei,QU Linhe, ZHANG Yongzhao   

  1. (School of Architecture and Planning, Yunnan University,Kunming 650500)
  • Received:2018-04-23 Revised:2018-05-10 Online:2019-03-02 Published:2019-03-08

摘要： 依据模型试验相似理论，采用砂土模拟现场地基土层，通过室内模型试验得出：螺纹桩抗拔承载力是等直径直线型桩的1.34~1.92倍；同直径螺纹桩从螺纹间距100 mm加密到50 mm时抗拔承载力约为1.1倍。对等直径螺纹间距为100 mm、50 mm螺纹桩的轴力、侧摩阻力、桩周土压力进行对比分析，得出50 mm螺纹间距桩的抗拔承载能力的优越性。最后，依据试验参数提出合理螺纹间距设置公式，并推导出螺纹灌注桩基于砂土层的抗拔承载力公式。

关键词: 螺纹灌注桩, 抗拔机理, 承载力, 室内模型试验

Abstract: According to the similarity theory of model test, sand soil was used to simulate the soil layer in the field. The comparative studies of the laboratory model show that the axial capacity of the threaded steel pile is 1.34~1.92 times those of the identical diameter pile without shreds. When the thread spacing was densified from 100 mm to 50mm, the uplift capacity was 1.1 times of that of 100 mm spacing. The soil pressures, skin friction and the axial capacity of threaded pile with thread spacings of 100 mm and 50mm were comparatively studied and it was concluded that spacing of 50mm threaded pile is a better product. The empirical formula for the axial uplift capacity is was also recommended based on the test results.

Key words: shredded steel pile, uplift capacity, axial capacity, laboratory model tests