Model test of vertical bearing capacity of cast-in-situ X-shaped concrete piles

ZHANG Min-xia; LIU Han-long; DING Xuan-ming; WANG Zhi-qiang

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Model test of vertical bearing capacity of cast-in-situ X-shaped concrete piles

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- Model test of vertical bearing capacity of cast-in-situ X-shaped concrete piles
- Vol. 33, Issue 2, (2012)
- 作者机构：
  
  1. 河海大学岩土力学与堤坝工程教育部重点实验室,南京,210098
  2. 河南理工大学土木工程学院,河南,焦作,454000
  3. 河海大学岩土工程科学研究所,南京,210098
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU473.1
- Online First：14 February 2012，
  
  Published：2012
- 稿件说明：
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ZHANG Min-xia, LIU Han-long, DING Xuan-ming, et al. Model test of vertical bearing capacity of cast-in-situ X-shaped concrete piles[J]. 2012, 33(2).
DOI：

ZHANG Min-xia, LIU Han-long, DING Xuan-ming, et al. Model test of vertical bearing capacity of cast-in-situ X-shaped concrete piles[J]. 2012, 33(2). DOI：

摘要

为研究现浇X形混凝土桩的荷载沉降特性及其荷载传递机制，利用河海大学的大型试验模型槽开展X形桩的足尺模型静载荷试验。通过在桩身设置的钢筋测力计及在桩底埋设的土压力盒，实测了在竖向荷载作用下X形桩与土相互作用时的工作性状。试验结果表明：X形桩的荷载沉降曲线为缓变型；桩侧摩阻力与桩端阻力随桩顶沉降的增加均呈递增性；但随着桩顶荷载的增加，桩侧摩阻力分担桩顶荷载比例却呈递减性，其分担桩顶荷载比例由初期的约90%下降到极限状态时的70%左右，而桩端阻力分担桩顶荷载的比例呈递增性，其分担桩顶荷载比例由初期的约10%上升到极限状态时30%左右。研究成果可为今后竖向受荷X形桩的设计与研究提供重要参考。

Abstract

To study the load settlement characteristics and load-transfer mechanism of cast-in-situ X-shaped concrete piles

full-scale model pile load test of X-shaped pile is carried out by using the large-scale test trench of Hohai University. The interaction behavior of the vertical loaded X-shaped piles is obtained by means of the reinforcement stress gauges set in the pile and earth-pressure boxes embedded in the pile bottom. The experiment results show that: X-shaped pile load settlement curve is an adjustment curve; pile side friction and tip resistance show incremental development with the increasing pile settlements; but with the increase of pile top load

the ratio of pile side resistance sharing pile head load is regressive

its sharing ratio decreases from the initial load of about 90% to 70% of the limit state

while the ratio of tip resistance sharing the load is incremental

the pile top load-sharing ratio of about 10% from the initial state up to 30% of the limit. The research results are useful for the design and analysis of X-shaped piles under vertical load.

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