上海交通大学学报

上海交通大学学报 ›› 2014, Vol. 48 ›› Issue (11): 1510-1516.doi: 10.16183/j.cnki.jsjtu.2014.11.002

所属专题： 王建华教授学报发文专辑

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大顶力作用下圆形沉井后背土体受力变形特性分析

朱龙1(), 徐震2, 白占伟3, 陈锦剑1, 王建华1()   

  1. 1.上海交通大学土木工程系，上海 　200240
    2.上海市政工程设计研究总院（集团）有限公司，上海 　200092
    3.上海城市排水有限公司，上海 　200233
  • 收稿日期:2013-12-24 出版日期:2014-11-01 发布日期:2014-11-28
  • 作者简介:朱龙（1988-)，男，江苏省盐城市人，硕士生，主要研究方向为大直径混凝土顶管工程．E-mail: zhulongzat@126.com.|王建华（联系人），男，教授，博士生导师，电话（Tel.): 021-34207002; E-mail: wjh417@sjtu.edu.cn.
  • 基金资助:
    上海市科学技术委员会重点项目(11231202400)

Behavior of Resisting Soil Behind a Circular Caisson Well with Large Jacking Force

ZHU Long1(), XU Zhen2, BAI Zhan-wei3, CHEN Jin-jian1, WANG Jian-hua1()   

  1. 1.Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China
    2.Shanghai Municipal Engineering Design Institute (Group) Co. , Ltd. , Shanghai 200092, China
    3.Shanghai Municipal Sewerage Co. , Ltd. , Shanghai 200233, China
  • Received:2013-12-24 Online:2014-11-01 Published:2014-11-28

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摘要：

通过现场监测的方法，对顶管工程圆形沉井在不同顶力作用下后背土体反力和位移变化进行分析研究，并结合有限元数值模拟方法，对现有不同的工作井后背土抗力分布形态进行对比验证．研究结果表明：圆形沉井工作井后背土抗力分布近似直线，但在沉井底板深度处因底板处刚度较大而产生突变，而后在刃脚处达到最大；顶力作用下沉井后背土体发生的位移较小，并表现为整体移动；验证了在沉井后背土体产生较小位移情况下视沉井前壁未达主动状态的合理性，进一步给出沉井后背土反力随距离的变化规律．

关键词: 顶管, 工作井, 圆形沉井, 土体反力, 位移

Abstract:

Analysis of soil counterforce and displacement of circular caisson pipe jacking project was made under the effect of different top edge using the site monitoring method as well as the comparative validation of distribution pattern of resistance of different open caisson using finite element numerical simulation methods. The results show that the distribution pattern of resistance of open caisson is approximated by a straight line which mutates in the depth of the caisson bottom due to the stiffness of the floor at large and reaches the maximum at the foot. The displacement of soil occurs less but as a whole under the jacking force. Simultaneously, the rationality of less than the active state was verified in the case that the soil of open caisson produces a smaller displacement under the caisson sinking back below the front wall of the active state which gives the variation of inking back soil reactions with the different distance.

Key words: pipe jacking, working well, circular caisson, earth counterforce, displacement

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