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基于柱孔扩张理论的沉井刃脚极限土阻力分析

周和祥 马建林 胡中波 陈文龙 杨柏

周和祥, 马建林, 胡中波, 陈文龙, 杨柏. 基于柱孔扩张理论的沉井刃脚极限土阻力分析[J]. 西南交通大学学报, 2020, 55(5): 1060-1066. doi: 10.3969/j.issn.0258-2724.20181045
引用本文: 周和祥, 马建林, 胡中波, 陈文龙, 杨柏. 基于柱孔扩张理论的沉井刃脚极限土阻力分析[J]. 西南交通大学学报, 2020, 55(5): 1060-1066. doi: 10.3969/j.issn.0258-2724.20181045
ZHOU Hexiang, MA Jianlin, HU Zhongbo, CHEN Wenlong, YANG Bai. Analysis of Ultimate Soil Resistance Beneath Cutting Curb Based on Cylindrical Cavity Expansion Theory[J]. Journal of Southwest Jiaotong University, 2020, 55(5): 1060-1066. doi: 10.3969/j.issn.0258-2724.20181045
Citation: ZHOU Hexiang, MA Jianlin, HU Zhongbo, CHEN Wenlong, YANG Bai. Analysis of Ultimate Soil Resistance Beneath Cutting Curb Based on Cylindrical Cavity Expansion Theory[J]. Journal of Southwest Jiaotong University, 2020, 55(5): 1060-1066. doi: 10.3969/j.issn.0258-2724.20181045

基于柱孔扩张理论的沉井刃脚极限土阻力分析

doi: 10.3969/j.issn.0258-2724.20181045
基金项目: 国家重点研发计划(No.2016YFC0802203)
详细信息
    作者简介:

    周和祥(1991—),男,博士研究生,研究方向为桥梁沉井基础工程,E-mail:1223591918@qq.com

    通讯作者:

    马建林(1958—),男,教授,研究方向为桥梁超深超大基础工程,E-mail:majianlin01@126.com

  • 中图分类号: TU473.2

Analysis of Ultimate Soil Resistance Beneath Cutting Curb Based on Cylindrical Cavity Expansion Theory

  • 摘要: 为解决目前刃脚极限土阻力计算方法所存在的不足,基于考虑剪胀效应的柱孔扩张理论,提出了刃脚极限土阻力的理论解答. 首先考虑刃脚基础单侧方向破坏的特点,将两个刃脚对称拼接成一个整体基础进行计算;其次利用柱孔扩张理论,通过分析刃脚底部土体在竖直方向的受力平衡求得刃脚极限土阻力;最后利用离心模型试验与现场监测对该计算方法进行了对比验证. 研究结果表明:与离心模型试验结果相比,当沉井下沉深度为36 m时,本文方法计算刃脚土阻力误差为6.6%,与现场实测结果相比,当沉井下沉深度为5 m时,本文方法计算刃脚土阻力误差为1.36%,当沉井下沉深度为10 m时,本文方法计算刃脚土阻力误差为19.5%,当沉井下沉深度为15 m时,本文方法计算刃脚土阻力误差为9.70%. 计算值与离心模型试验值、现场实测值均吻合较好. 本研究可为刃脚极限土阻力计算问题提供一个新思路.

     

  • 图 1  柱孔扩张计算模型

    Figure 1.  Model of cylindrical cavity expansion

    图 2  刃脚组合计算模式

    Figure 2.  Combined calculation mode of cutting curbs

    图 3  刃脚极限土阻力

    Figure 3.  Ultimate soil resistance beneath the cutting curb

    图 4  摩尔应力圆

    Figure 4.  Mohr’s stress circle

    图 5  离心模型试验布置(单位:cm)

    Figure 5.  Layout diagram of centrifuge model test (unit:cm)

    图 6  土压力传感器布置(单位:cm)

    Figure 6.  Layout diagram of earth pressure sensor (unit: cm)

    图 7  刃脚土压力传感器平面布置

    Figure 7.  Layout diagram of earth pressure sensor at the cutting curb

    表  1  结果比较(计算值与离心模型试验值)

    Table  1.   Comparison of results (calculated values and centrifuge model test)

    沉井下沉
    深度/m
    计算刃脚土
    阻力/(kN•m−1
    实测刃脚土
    阻力/(kN•m−1
    误差/
    %
    366583.86175.86.6
    下载: 导出CSV

    表  2  结果比较(计算值与现场实测值)

    Table  2.   Comparison of results (calculated values and field measured values)

    沉井下沉
    深度/m
    计算刃脚土阻
    力/(kN•m−1
    实测刃脚土阻
    力/(kN•m−1
    误差/
    %
    52653.82690.41.36
    103720.84622.519.50
    154607.95102.59.70
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-12-05
  • 修回日期:  2019-04-01
  • 网络出版日期:  2019-04-04
  • 刊出日期:  2020-10-01

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