高级搜索
  • 全国中文核心期刊
  • 中国科技核心期刊
  • 美国工程索引（EI）收录期刊
  • Scopus数据库收录期刊

刚性桩加固高速公路软基性状分析

曹卫平, 赵敏

曹卫平, 赵敏. 刚性桩加固高速公路软基性状分析[J]. 岩土工程学报, 2011, 33(sup2): 217-223.
引用本文: 曹卫平, 赵敏. 刚性桩加固高速公路软基性状分析[J]. 岩土工程学报, 2011, 33(sup2): 217-223.
shu
CAO Wei-ping, ZHAO Min. Behaviors of rigid piles for reinforcing highway embankments in soft soils[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(sup2): 217-223.
Citation: CAO Wei-ping, ZHAO Min. Behaviors of rigid piles for reinforcing highway embankments in soft soils[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(sup2): 217-223.
shu

刚性桩加固高速公路软基性状分析  English Version

  • 1.西安建筑科技大学土木工程学院,陕西 西安 710055 ； 2. 西安工业大学建筑工程学院,陕西 西安 710032

基金项目: 国家自然科学基金项目(51078308)；陕西省教育厅科学研
详细信息
    作者简介:

    曹卫平 (1969 – ) ,男,陕西杨凌人,博士,副教授,主要从事土力学、地基处理等方面的教学与研究工作。

  • 中图分类号: TU471

Behaviors of rigid piles for reinforcing highway embankments in soft soils

  • 1. College of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China; 2. College of Civil Engineering Xi'an Technological University, Xi’an 710032, China

摘要

    摘要
  • 摘要: 刚性桩在高速公路软土地基处理中得到了广泛应用,但目前对其承载变形机理还缺乏深刻认识。采用数值方法对端承型桩及摩擦型桩在路堤填筑及软基固结过程中桩土应力比、桩土沉降、桩身轴力、负摩阻力及中性点深度的发展变化规律进行了分析。分析结果表明：①不论端承型桩还是摩擦型桩,由于其刚度远大于桩间土刚度,因此绝大部分路堤荷载由桩承担,桩间土仅承担了少部分路堤荷载。桩间土土压力随着路堤填筑和软土固结经历了先增大、然后减小、最终趋于稳定的过程；②路堤填筑及软基固结过程中,端承型桩仅发生很小的沉降,其大部分沉降发生在路堤填筑过程中,摩擦型桩的沉降则较大,其大部分沉降发生在路堤填筑完毕之后的软基固结过程中。端承型桩大部分区段桩身沉降小于桩侧土沉降,而摩擦型桩大部分区段桩身沉降大于桩侧土沉降；③无论是端承型桩还是摩擦型桩,在路堤填筑过程中,桩身轴力及负摩阻力增加均较快,而在软基固结过程中增加则较慢。端承型桩的大部分桩段存在负摩阻力,摩擦型桩的负摩阻力分布区段则较短；④在路堤填筑及软基固结过程中 , 桩身中性点位置经历了比较复杂的变化过程。
    Abstract: Rigid piles have been widely used to reinforce highway embankments in soft soils due to their rapid construction, low costs, and small total and differential settlements, while their mechanism has been still incompletely understood till now. A numerical analysis is conducted to evaluate the variation of the soil stress concentration ratio, pile and soil settlements, pile shaft axial forces, negative skin friction and neutral plane for end-bearing piles as well as floating piles during the embankment filling and the consolidation of soft soils. The results indicate that the stress concentration ratio varies with the embankment filling and the consolidation of soft soils, and most of embankment load is born by the pile owing to that the pile stiffness is significantly greater than that of soft soils. The end-bearing pile settles a little and most of the settlement occurs during the embankment filling while the settlement of the floating pile is much greater and most of the settlement occurs during the soil consolidating. The settlement of most part of the end-bearing pile shaft is greater than that of the surrounding soil, but the settlements of most part of the floating pile shaft is less than that of the surrounding soil. The pile axial force and negative skin friction, for the end-bearing pile and the floating pile, develops more quickly during the embankment filling than during the soil consolidating. Negative skin friction develops along most part of the end-bearing pile shaft while only a small part for the floating pile. The location of the neutral plane exhibits a complicated variation.
    • HTML全文
    • 参考文献(12)
  • [1] 陈小庭 , 夏元友 , 芮 瑞 , 等 . 管桩加固软土路堤桩土应力比现场试验 [J]. 中国公路学报 , 2006, 19 (3): 12 – 18. (CHEN Xiao-ting, XIA Yuan-you, RUI Rui, et al. Field experiment on pile-soil stress of soft subgrade reinforced by pre-stress concrete piles[J]. Chinese Journal of Highway and Transport, 2006, 19 (3): 12 – 18. (in Chinese))
    [2] 贾 宁 , 陈仁朋 , 陈云敏 , 等 . 杭甬高速公路拓宽工程理论分析及监测 [J]. 岩土工程学报 , 2004, 26 (6): 755 – 760. (JIA Ning, CHEN Ren-peng, CHEN Yun-min, et al. Theoretical Analysis and Measurement for widening project of Hangzhou-ningbo expressway[J]. Chinese Journal of Geotechnical Engineering, 2004, 26 (6): 755 – 760. (in Chinese))
    [3] 夏元友 , 芮 瑞 . 刚性桩加固软土路堤竖向土拱效应的试验研究 [J]. 岩土工程学报 , 2006, 28 (3): 327 – 331. (XIA Yuan-you, RUI Rui. Experimental research on vertical soil arching effect of embankment reinforced by rigid piles[J]. Chinese Journal of Geotechnical Engineering, 2006, 28 (3): 327 – 331. (in Chinese)).
    [4] HAN J, GABR M A. Numerical analysis of Geosynthetic reinforced and pile-supported earth platforms over soft soil[J]. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 2002, 128 (1): 44 – 53.
    [5] 袁灯平 , 黄宏伟 , 程泽坤 . 软土地基桩侧负摩阻力研究进展初探 [J]. 土木工程学报 , 2006, 39 (2): 53 – 60. (YUAN Deng-ping, HUANG Hong-wei, CHEN Ze-kun. Recent research on the negative skin friction of piles in soft soils[J]. China Journal of Civil Engineering, 2006, 39 (2): 53 – 60. (in Chinese))
    [6] CHARLES W W Ng, POULOS H G, CHAN V S H, et al. Effects of tip location and shielding on piles in consolidating ground[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2008, 134 (9): 1245 – 1260.
    [7] LEUNG C F, RADHAKRISHNAN R, TAN S A. Performance of precast driven piles in marine clay[J]. Journal of Geotechnical Engineering, 1991, 117 (4): 637 – 657.
    [8] 曹卫平 , 陈云敏 . 台华高速公路路堤失稳原因分析及对策 [J]. 岩石力学与工程学报 , 2007, 26 (7): 1504 – 1510. (CAO Wei-ping, CHEN Yun-min. Analyses on the failure mechanism and treatment for taihua highway embankment slope over soft soils[J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26 (7): 1504 – 1510. (in Chinese))
    [9] ORIANNE J, DANIEL D, RICHARD K. Soft ground improvement by vertical rigid piles two-dimensional physical modelling and comparision with current design methods[J]. Soils and Foundations, 2005, 45 (6): 15 – 30.
    [10] LAM S Y, CHARLES W W Ng, LEUNG C F, et al. Centrifuge model and numerical modeling of axial load effects on piles in consolidating ground[J]. Canadian Geotechnical Journal, 2009, 46 (1): 10 – 24.
    [11] JEONG S, KIM S, BRIAUD J L. Analysis of downdrag on pile groups by the finite element method[J]. Computers and Geotechnics, 1997, 21 (2): 143 – 161.
    [12] 曹卫平 , 陈云敏 , 陈仁朋 . 考虑路堤填筑过程与地基土固结相耦合的桩承式路堤土拱效应分析 [J]. 岩石力学与工程学报 , 2008, 27 (8): 1610 – 1617. (CAO Wei-ping, CHEN Yun-min, CHEN Reng-peng. Analysis of soil arching in piled embankments considering coupled effect of embankment filling and soil consolidation[J]. Chinese Journal of Rock Mechanics and Engineering, 2008, 27 (8): 1610 – 1617. (in Chinese))
    • 相关文章
    • 施引文献
    • 资源附件(0)
计量
  • 文章访问数:  1155
  • HTML全文浏览量:  1
  • PDF下载量:  561
  • 被引次数: 0
出版历程
  • 收稿日期:  2011-08-02
  • 发布日期:  2011-12-06

目录

摘要
HTML全文
    参考文献(12)
    相关文章
    施引文献
    资源附件(0)

    /

    返回文章
    返回
    版权所有 © 2010水利部交通部国家能源局南京水利科学研究院 苏ICP备05007122号-11公安联网备案号：32010602011255
    编辑部地址：南京市虎踞关34号《岩土工程学报》编辑部邮编：210024电话：025-85829534，85829556E-mail: ge@nhri.cn