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隧道建设(中英文) ›› 2016, Vol. 36 ›› Issue (7): 826-831.DOI: 10.3973/j.issn.1672-741X.2016.07.009

• 研究与探索 • 上一篇    下一篇

西安地铁侧坡出入段线上跨既有隧道施工影响分析

刘淼   

  1. (北京安捷工程咨询有限公司, 北京 100037)
  • 收稿日期:2016-01-26 修回日期:2016-03-17 出版日期:2016-07-20 发布日期:2016-07-27
  • 作者简介:刘淼(1988—),男,河南南阳人,2014年毕业于中国石油大学(北京),工程力学专业,博士,工程师,现从事地铁施工、隧道施工安全风险咨询工作。Email: flygogo@163.com。

Analysis of Influence of Construction of Access Section of Xi’an Metro on Existing Shield Tunnels

LIU Miao   

  1. (AGILETECH Engineering Consultants Co., Ltd., Beijing 100037, China)
  • Received:2016-01-26 Revised:2016-03-17 Online:2016-07-20 Published:2016-07-27

摘要:

地铁近接施工安全影响是轨道交通建设所面临的重要问题,相关研究与分析对于现场施工及既有结构安全具有重要意义。以西安地铁6号线侧坡出入段线明挖上跨既有区间隧道为背景,通过对出入段线分块、分层开挖以及结构回填过程的数值模拟,得出明挖施工卸载再加载过程对下卧隧道的影响程度。计算表明,周边地层受明挖施工卸载再加载效应影响较为明显,总体变形表现为隆起抬升,最大隆起量出现在基坑底部,约为48.15 mm;下卧隧道受出入段线施工影响的最大隆起量为10.86 mm,结构差异变形量为0.008 9%,出现在右线隧道被上跨部分底部;隧道管片最大拉应力为2.13 MPa,最大压应力为4.92 MPa。隧道变形量满足结构安全要求,隧道结构应力远小于其设计强度,出入段线施工对下卧隧道影响较小。

关键词: 西安地铁, 出入段线, 近接开挖, 影响性评估, 明挖法, 盾构隧道

Abstract:

The study of influence of Metro construction on existing structures is very important. Numerical simulation is made on portioning excavation and structural backfilling of access section of Xi’an Metro Line No. 6 crossing above existing shield tunnels. The influence of unloading and reloading induced by open cut construction of the access section on lower shield tunnels is studied. The calculation results show that: 1) The influence of unloading and reloading induced by open cut construction of the access section on surrounding soils is obvious; the soils tend to uplifting and the maximum uplifting occurs to foundation pit base for about 48.15 mm. 2) The maximum uplifting of lower right line shield tunnel is 10.86 mm; and the differential deformation of structure is 0.008 9%. 3) The maximum tensile strength and compressive strength of tunnel segment are 2.13 MPa and 4.92 MPa respectively. The results show that the deformations and stresses of the tunnels can meet the safety requirements.

Key words: Xi’an Metro, access line, adjacent excavation, influence assessment, open cut method, shield tunnel

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