东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2013, Vol. 34 ›› Issue (5): 704-707.DOI: -

• 资源与土木工程 • 上一篇    下一篇

大跨度卸载对下卧盾构隧道影响的数值分析

赵文，关永平，李慎刚，纪新博   

  1. (东北大学资源与土木工程学院，辽宁沈阳110819)
  • 收稿日期:2012-11-26 修回日期:2012-11-26 出版日期:2013-05-15 发布日期:2013-07-09
  • 通讯作者: 赵文
  • 作者简介:赵文(1962-)，男，辽宁沈阳人，东北大学教授，博士生导师.
  • 基金资助:
    国家“十二五”科技支撑计划项目(2012BAK24B01)；中央高校青年教师科研启动基金资助项目(N110301003).

Numerical Analysis on the Effect of LargeSpan Unloading on Underlying Shield Tunnel

ZHAO Wen， GUAN Yongping， LI Shengang， JI Xinbo   

  1. School of Resources ＆ Civil Engineering， Northeastern University， Shenyang 110819， China.
  • Received:2012-11-26 Revised:2012-11-26 Online:2013-05-15 Published:2013-07-09
  • Contact: GUAN Yongping
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摘要： 结合哈大客专沈阳站房改造工程研究了大跨度卸载对下卧既有盾构隧道管片及接头的影响.为准确反映管片环向接头在附加荷载作用下的张开、错位等情况，基于Flac3D建立三维模型，运用嵌入式梁单元模拟了螺栓接头，并针对实际工程中坑底堆载保护措施进行了数值计算.结果表明，既有隧道在2倍卸载宽度范围内发生隆起变形，最大隆起量为1593mm，最小纵向曲率半径为28248m，并且管片环向接头在附加荷载作用下产生的错位量及张开量分别为067，137mm，各项控制指标均满足工程要求.表明坑底堆载措施能保证盾构管片及接头在上部基坑施工期间的安全性.

关键词: 基坑工程, 下卧隧道, 管片接头, Flac3D, 施工方案

Abstract: Based on the pit excavation engineering in Shenyang， which sits atop the existing tunnels， the effect of shield tunnel segment joint was studied. In order to accurately reflect the opening of segment joint for additional load， threedimensional model was created in Flac3D， which simulating segment joint by embedded beam elements. The result indicate that uplift deformation scope of existing tunnel is about 20 times of the excavation width， maximum uplift is about 1593mm， minimum longitudinal radius of curvature is about 28248m. The opening and dislocation of radial segment joint are 067mm， 137mm respectively， all control target meet the engineering requirements. The surcharge of heap loading will guarantee the security of shield segments and joints during in the construction of pit engineering.

Key words: foundation pit engineering, down tunnel, segments joint, Flac3D, construction scheme

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