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小间距平行顶管管道土压力计算方法研究

杨仙 肖宇锋 黎永索 陈娟

杨仙, 肖宇锋, 黎永索, 陈娟. 小间距平行顶管管道土压力计算方法研究[J]. 工程科学学报. doi: 10.13374/j.issn2095-9389.2021.03.17.002
引用本文: 杨仙, 肖宇锋, 黎永索, 陈娟. 小间距平行顶管管道土压力计算方法研究[J]. 工程科学学报. doi: 10.13374/j.issn2095-9389.2021.03.17.002
YANG Xian, XIAO Yu-feng, LI Yong-suo, CHEN Juan. Calculation method of the earth pressure for parallel pipe jacking with small spacing[J]. Chinese Journal of Engineering. doi: 10.13374/j.issn2095-9389.2021.03.17.002
Citation: YANG Xian, XIAO Yu-feng, LI Yong-suo, CHEN Juan. Calculation method of the earth pressure for parallel pipe jacking with small spacing[J]. Chinese Journal of Engineering. doi: 10.13374/j.issn2095-9389.2021.03.17.002

小间距平行顶管管道土压力计算方法研究

doi: 10.13374/j.issn2095-9389.2021.03.17.002
基金项目: 国家自然科学基金资助项目(51678226);湖南省自然科学基金资助项目(2019JJ50150)
详细信息
    通讯作者:

    E-mail: chenjuan@hnust.edu.cn

  • 中图分类号: P642.3

Calculation method of the earth pressure for parallel pipe jacking with small spacing

More Information
  • 摘要: 小间距顶管过程中,由于管−管相互作用的影响,使得管周土压力分布与单管顶进土压力分布模式产生差异,从而造成小间距顶管荷载确定、结构计算及顶力估算与控制等设计施工难题。结合数值模拟反分析,基于太沙基土压力理论和极限平衡理论,假设了土体松动线和上部既有顶管的支挡作用线,进一步构建了小间距平行顶管管道拱顶垂直土压力的计算方法。基于构建的土压力计算方法,分析了土体抗剪强度、管径、管间距等对新建顶管拱顶土压力的影响,并与不考虑既有顶管影响的土柱理论和太沙基理论计算值进行了对比。计算结果表明:土体抗剪强度越大,新建顶管拱顶垂直土压力越大,而其侧面的土压力越小;抗剪强度较大时,新构建方法计算拱顶土压力小于太沙基理论计算结果,抗剪强度较小时,新构建方法计算拱顶土压力大于太沙基理论计算结果;顶管埋深增加时,新建顶管拱顶土压力增加,相较于土柱理论和太沙基理论,新构建方法计算的新建顶管拱顶土压力增量最小;随着管间距增加,新建顶管拱顶土压力越来越大。

     

  • 图  1  小间距平行顶管土压力计算示意图

    Figure  1.  Schematic of earth pressure calculation of parallel pipe jacking with small spacing

    图  2  数值模拟云图.(a)竖向位移云图;(b)竖向正应力云图

    Figure  2.  Cloud images of (a) vertical displacement and (b) vertical normal stress from numerical simulation

    图  3  AB段微元体受力示意图

    Figure  3.  Schematic of force on the micro-element in the AB segment

    图  4  BC段微元体受力示意图

    Figure  4.  Schematic of force on the micro-element in the BC segment

    图  5  CD段微元体受力示意图

    Figure  5.  Schematic of force on the micro-element in the CD segment

    图  6  GIH段微元体受力示意图

    Figure  6.  Schematic of force on the micro-element in the GIH segment

    图  7  既有顶管受力平衡示意图

    Figure  7.  Schematic of force balance of the existing pipe jacking

    图  8  内摩擦角影响分析

    Figure  8.  Analysis of the internal friction angle impact

    图  9  黏聚力影响分析

    Figure  9.  Analysis of the cohesion impact

    图  10  顶管埋深影响分析

    Figure  10.  Analysis of the buried depth impact

    图  11  顶管间距影响分析

    Figure  11.  Analysis of the pipe jacking spacing impact

    图  12  两管不同排布情况下假设条件示意图

    Figure  12.  Schematic of the assumed conditions in the different arrangement of the two pipes

    表  1  数值模拟材料力学参数

    Table  1.   Mechanical parameters of the materials in numerical simulation

    Cohesive forces
    of soil/kPa
    Internal friction
    angle of soil/(°)
    Unit weight
    of soil/
    (kN·m−3)
    Elastic modulus
    of steel/Pa
    Poisson’s ratio
    of steel
    Unit weight
    of steel/
    (kN·m−3)
    530192×10110.378
    下载: 导出CSV
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  • 收稿日期:  2021-03-17
  • 网络出版日期:  2021-06-18

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