Analyses of load transfer mechanism of single piles considering
 vertical shearing effect

LI Ping; Lü Ya-ru; LIU Han-long; DING Xuan-ming

doi:10.16285/j.rsm.2015.S2.051

English Version Journal Login

您当前的位置：

首页 >

文章列表页 >

Analyses of load transfer mechanism of single piles considering vertical shearing effect

更新时间：2026-06-25

- Analyses of load transfer mechanism of single piles considering vertical shearing effect
- Vol. 36, Issue S2, Pages: 371-376(2015)
- 作者机构：
  
  1. 河海大学土木与交通学院,江苏,南京,210098
  2. 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
  3. 重庆大学土木工程学院,重庆,400044
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2015.S2.051
  CLC： TU443
- Online First：14 June 2018，
  
  Published：2015
- 稿件说明：
移动端阅览
LI Ping, Lü Ya-ru, LIU Han-long, et al. Analyses of load transfer mechanism of single piles considering vertical shearing effect[J]. 2015, 36(S2): 371-376.
DOI：

LI Ping, Lü Ya-ru, LIU Han-long, et al. Analyses of load transfer mechanism of single piles considering vertical shearing effect[J]. 2015, 36(S2): 371-376. DOI： 10.16285/j.rsm.2015.S2.051.

摘要

桩的存在使桩周土的竖向有效应力不等于上覆土自重应力与上部外加荷载的简单叠加，原因是桩-土相对刚度导致桩-土接触面上产生竖向剪切。通过平衡分析法，得到不同荷载形式下桩周土竖向有效应力、桩侧正（负）摩阻力、总侧摩阻力和轴力（下拽力）的计算方法，根据已开展的饱和黏土中单桩的负摩阻力试验，验证了公式的合理性，证明了考虑竖向剪切效应的必要性。通过计算分析可知：桩周土竖向均布荷载作用下，桩-土竖向剪切效应削弱了桩周土竖向有效应力、桩侧负摩阻力和桩身下拽力，剪切效应的控制参数?分别取-0.01、-0.02和-0.04时，靠近桩端的桩侧负摩阻力分别为? = 0时的91%、83%和71%，靠近桩端的桩身下拽力分别为? = 0时的93%、87%和76%。由于下拽力受截面几何参数影响，其折减程度略小于桩侧负摩阻力。因此，桩周土表面均布荷载作用时，忽略桩-土竖向剪切效应可能高估由下拽力引起的桩顶沉降。

Abstract

As is well-known

the effective vertical stress of surrounding soil element of pile foundation is not identical to the dead weight of overburden soil plus the applied surcharge load. This is because the vertical shearing is developed on pile-soil interface due to the large pile-soil relative stiffness. The analytical solutions for the effective vertical stress

the unit positive (negative) shaft resistance

the total shaft resistance and the axial force (dragload)

subject to axial and surcharge loads

are derived by means of equilibrium analyses. Those solutions are calibrated by the reported test result of a single pile in saturated clay. It is shown that those solutions are reasonable and it is necessary to consider the vertical shearing of pile-soil interface. Under the surcharge load

the vertical shearing weakens the effective vertical stress

the unit negative shaft resistance and the dragload. The negative shaft resistances at the pile tip of the cases ? = -0.01

-0.02 and -0.04 are reduced to 91%

83% and 71% that of the case ? = 0

respectively. Meanwhile

the induced dragload at the pile tip of the cases ? = -0.01

-0.02 and -0.04 are reduced to 93%

87% and 76% that of the case ? = 0

respectively. The dragload is reduced slight smaller than the negative shaft resistance since it is also controlled by the cross-sectional geometries. This indicates that pile settlement is always overestimated independent of the vertical shearing.

关键词

Keywords

references

Views

260

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Finite element analysis of effects of shield driven tunneling on pile foundation

Finite element analysis of bearing capacity of pile under inclined load in layered soil

Calculation of upright post pile deformation in processes of foundation excavation

Model test study of negative skin friction for single pile under surface load

A modified Geddes’s method for estimating settlement of pile foundation considering influences of pile diameter and distribution pattern of shaft resistance

Related Author

WANG Li

ZHENG Gang

WANG Li

TANG Shi-dong

LI Hong

SU Yu-jie

WANG Song-ping

Related Institution

School of Civil and Safety Engineering, Dalian Jiaotong University

MOE Key Laboratory of Coast Civil Structure Safety, Tianjin University

Department of Civil Engineering, Tianjin University

Department of Geotechnical Engineering, Tongji University

Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University

AI问答

⁰