黄土山区冲沟地形对桥梁桩基有效桩长影响研究

王磊; 刘晓健; 刘志华; 杨国俊; 郭震山

doi:10.13409/j.cnki.jdpme.2020.04.016

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黄土山区冲沟地形对桥梁桩基有效桩长影响研究

更新时间：2025-09-25

- 黄土山区冲沟地形对桥梁桩基有效桩长影响研究
- Influence of Gulch Topography on Effective Length of Bridge Pile Foundationin in Loess Hilly Area
- 防灾减灾工程学报 2020年40卷第4期页码：614-622
- 作者机构：
  
  1.山西交通科学研究院集团有限公司桥梁工程防灾减灾山西省重点实验室，山西太原 030006
  2.陕西省高速公路建设集团公司，陕西西安 710075
  3.兰州理工大学防震减灾研究所，甘肃兰州 730050
- 作者简介：
  
  王　磊（1988-），男，工程师，工学硕士。主要从事特殊地区桥梁防灾减灾与安全风险评估。Email:741902424@qq.com
- 基金信息：
  
  山西省交通运输厅科技项目(2017⁃1⁃23);山西交通控股集团有限公司科技项目(19-JKKJ-9);甘肃省自然科学基金项目(2017GS10911)
- DOI：10.13409/j.cnki.jdpme.2020.04.016
  中图分类号： U443.15
- 收稿：2018-07-17，
  
  修回：2018-10-15，
  
  纸质出版：2020-08-15
- 稿件说明：
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王磊,刘晓健,刘志华等.黄土山区冲沟地形对桥梁桩基有效桩长影响研究[J].防灾减灾工程学报,2020,40(04):614-622.

WANG Lei,LIU Xiaojian,LIU Zhihua,et al.Influence of Gulch Topography on Effective Length of Bridge Pile Foundationin in Loess Hilly Area[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(04):614-622.
王磊,刘晓健,刘志华等.黄土山区冲沟地形对桥梁桩基有效桩长影响研究[J].防灾减灾工程学报,2020,40(04):614-622. DOI： 10.13409/j.cnki.jdpme.2020.04.016.

WANG Lei,LIU Xiaojian,LIU Zhihua,et al.Influence of Gulch Topography on Effective Length of Bridge Pile Foundationin in Loess Hilly Area[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(04):614-622. DOI： 10.13409/j.cnki.jdpme.2020.04.016.

摘要

为全面了解黄土山区冲沟地形对桥梁桩基有效长度的影响，在对山西省典型黄土山区桥梁下部全面调查的基础上，依据黄土地区现场桩基静载试验，应用FLAC

建立黄土山区地形桥梁桩基有限差分模型，分析了不同坡度、临坡距、桩长变化对桩基有效桩长的影响，揭示了桩基承载力、桩侧摩阻力、桩端阻力及有效桩长变化规律，并依据计算结果提出相关工程技术建议。研究结果表明：一定桩长时，斜坡坡度、临坡距变化对桩侧摩阻力产生不同程度影响，对桩端阻力影响不大；坡度越大，临坡距越小，桩侧摩阻力减小幅度越显著，最大为70.89%；坡度较小、临坡距较大时，增长桩长使桩侧摩阻力从95.99%提高至99.71%；桩侧摩阻力变化的根本原因是桩基有效长度发生改变，桩基有效桩长折减程度同斜坡坡度及桩基临坡距有关，与桩长无关；建立的桩基有效长度计算公式可为黄土山区冲沟地形条件桩基础设计提供技术借鉴。

Abstract

Based on widely investigation on bridges foundation in loess area of Shanxi province and on-site pile static loading test

the parameters of slope gradient

slope distance and pile length were analyzed to study the influence of gulch topography on effective length of bridge pile in loess hilly area. By means of the FLAC3D finite analysis

the change rules of ultimate bearing capacity

pile lateral friction

tip resistance and effective pile length were obtained

and furthermore some suggestions for engineering were provided. The research shows that: with certain pile length

the slope gradient and slope distance have great influence on pile lateral friction

and has little influence on tip resistance. Moreover

the lateral friction of the pile gradually reduces with increase of slope angle and decrease of distance to the slope. The reduction can reach 70.89%. The lateral friction can rise from 95.99% to 99.71% by elongating the pile length for the ground with small slope angle or long distance to the slope. The basic influence factor on lateral friction is the effective length of the pile. The reduction coefficient of the effective length of the pile is independent of pile length

and closely related to the slope gradient and the distance to the slope. Finally

the calculation formula of pile effective length is provided

which gives an effective technical reference for pile design in gulch topography of loess hilly area.

关键词

Keywords

references

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