东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2014, Vol. 35 ›› Issue (10): 1507-1511.DOI: 10.12068/j.issn.1005-3026.2014.10.031

• 资源与土木工程 • 上一篇    下一篇

砂土中隧道垂直下穿既有管线的数值模拟

王正兴，缪林昌，石文博   

  1. (东南大学 交通学院，江苏 南京210096)
  • 收稿日期:2014-04-23 修回日期:2014-04-23 出版日期:2014-10-15 发布日期:2014-05-19
  • 通讯作者: 王正兴
  • 作者简介:王正兴(1981-)，男，江苏海门人，东南大学博士研究生；缪林昌(1961-)，男，江苏靖江人，东南大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51278099).

Numerical Simulation on Effects of Vertical Tunnel Excavation on Underground Pipeline in Sand

WANG Zhengxing， MIAO Linchang， SHI Wenbo   

  1. School of Transportation， Southeast University， Nanjing 210096，China.
  • Received:2014-04-23 Revised:2014-04-23 Online:2014-10-15 Published:2014-05-19
  • Contact: WANG Zhengxing
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摘要： 为研究隧道施工条件下管线的变形，通过开发颗粒流程序及利用室内管线加载-挠度试验建立了管线宏细观参数之间的关系.基于PFC2D建立了隧道-土体-管线的数值模型，模拟砂土中隧道垂直下穿既有管线过程中管线的变形位移.通过数值模拟分析了地层损失率及管线与隧道间距对模拟结果的影响规律.结果表明:随着地层损失率的增加及管隧间距的减小，管线中间的下拉效应与距管线中点35倍隧道直径处的上拱效应越明显；管线中部上覆附加应力会随地层损失率的增大及管隧间距的减小而增大，同时对应管底土压力则迅速减小并稳定在一较小值；管线与管底土层沉降槽宽度系数比值(ip/i)与地层损失率成正比，而与管隧间距成反比，最大值可达到24.

关键词: 隧道施工, 管线, 颗粒流, 沉降, 砂土, 附加荷载

Abstract: In order to investigate the deformation of pipeline during tunnel excavation， the relations between the macroscopic and microscopic parameters of pipelines were formed based on laboratory deflection test and PFC programming. Based on the PFC2D， the numerical model of the tunnelsoilunderground pipeline was established for simulating the deformation of pipelines during tunneling in sand， and the effects of ground loss and tunnelpipeline space were examined. The numerical results showed that the behavior of pipelines is negative downdrag in the middle and positive downdrag at 35 times the diameter of tunnel from the middle of pipelines， which are greater under the increase of ground loss and decrease of tunnelpipeline space. With increasing ground loss and decreasing tunnelpipeline space， the additional load on the top of pipeline increases and the vertical earth pressure decreases quickly at the bottom of the pipeline， which trends to reach a final value. The ratio of ip/i as the width coefficient is proportional to the ground loss， and inversely proportional to the tunnelpipeline space， where the maximum value of 24 can be reached.

Key words: tunnel excavation, pipeline, PFC2D, settlement, sand, additional load

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