土工基础

›› 2012, Vol. 26 ›› Issue (3): 40-42.

• 工程实录 • 上一篇    下一篇

明挖隧道近距离上跨地铁隧道的影响分析

李红丽   

  1. （中铁第四勘察设计院，武汉 430063）
  • 收稿日期:2012-04-05 出版日期:2012-06-20 发布日期:2012-06-25
  • 作者简介:李红丽（1976-），女，工程师，毕业于石家庄铁道学院。

Analysis of the Impact of a Cut and Cover Tunnel Construction over the Subway

LI Hongli   

  1. （China Railway Siyuan Survey and Design Group Co., LTD, Wuhan Hubei 430063）
  • Received:2012-04-05 Online:2012-06-20 Published:2012-06-25

摘要： 通过对宁芜改线工程南京南明挖隧道近距离上跨南京地铁区间隧道的设计，利用数值模拟的手段对明挖隧道的基坑施工引起的下部隧道结构的上抬及受力变化值进行预判，根据预判值调整及优化设计。通过将数值模拟结果与实测值进行比对可知，两者较为吻合，认为计算中选取的模型及参数较为合理，数值计算可以对设计方案的合理性及影响进行判断。

关键词: 明挖隧道, 数值模拟, 基坑, 预判值, 卸载

Abstract: Subway network grows rapidly in many large cities. More and more subway lines will unavoidably cross over with the further network expansion. It is critical for the operational safety of the existing subway while constructing the new crossover subway tunnel. This paper presents the numerical analysis results of a cut and cover tunnel in south Nanjing over the existing subway. The bottom heave of the existing subway during the open cut construction is predicted. The construction sequence is optimized based on the numerical analysis results. The upheaval values from the numerical simulations are compared with the observed deformation during the construction and found they were consistent. It is concluded that the numerical analysis can provide valuable guidance during the design stage.

Key words: Cut and cover tunnels, Numerical analyses, Deep excavations, Predicted values, Unloading