Visualization comparative model tests on neutral point position of 
tapered pile and equal section pile

KONG Gang-qiang; SUN Xue-jin; CAO Zhao-hu; ZHOU Yang

doi:10.16285/j.rsm.2015.S1.007

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Visualization comparative model tests on neutral point position of tapered pile and equal section pile

更新时间：2026-06-25

- Visualization comparative model tests on neutral point position of tapered pile and equal section pile
- Vol. 36, Issue S1, Pages: 38-42(2015)
- 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,江苏,南京,210098
  2. 河海大学土木与交通学院,江苏,南京,210098
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2015.S1.007
  CLC： TU473
- Online First：14 June 2018，
  
  Published：2015
- 稿件说明：
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KONG Gang-qiang, SUN Xue-jin, CAO Zhao-hu, et al. Visualization comparative model tests on neutral point position of tapered pile and equal section pile[J]. 2015, 36(S1): 38-42.
DOI：

KONG Gang-qiang, SUN Xue-jin, CAO Zhao-hu, et al. Visualization comparative model tests on neutral point position of tapered pile and equal section pile[J]. 2015, 36(S1): 38-42. DOI： 10.16285/j.rsm.2015.S1.007.

摘要

地面堆载作用下楔形桩中楔形角的存在可以降低桩身下拽力，但针对倒楔形角的存在与中性点位置关系的研究却相对较少。为了分析地面堆载作用下楔形桩和等截面桩的桩-土相互作用机制，基于透明土材料和PIV（particle image velocimetry）技术，采用非插入式测试方法开展地面堆载作用下楔形桩和等截面桩中性点位置的对比模型试验研究，测得不同地面堆载等级作用下桩体沉降与桩周土体沉降等变化规律，探讨了桩-土相对位移、中性点位置与地面荷载等级的变化规律。研究结果表明，利用透明土材料来研究桩基中性点位置的试验方法在技术上是可行的；文中试验条件下楔形桩和等截面桩中性点位置均随着地面堆载等级的增加而降低。

Abstract

The dragload of tapered pile can be reduced by inverted tapered angle. However

the researches focused on the relationship between tapered angle and neutral point position are relatively little. In order to analyze the pile-soil interaction mechanism of tapered pile and equal section pile under surcharge load

based on transparent soil material and particle image velocimetry(PIV) technology

model test on neutral point position of tapered pile and equal section pile are comparatively carried out. The pile and layered soil settlement under different surcharge loads are non-intrusively measured. The pile-soil relative displacement and neutral point position versus surcharge loads are analyzed and discussed. The results show that transparent soil material is technically feasible for studying the neutral point position of piles problems. The results also show that the neutral point position of tapered pile and equal section pile decrease with surcharge loads increasing in this model test condition.

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