砂卵石地层地铁隧道上方基坑开挖卸载影响与对策分析

戴志仁; 王天明; 杜宇; 汪珂; 向阳

doi:10.3973/j.issn.1672-741X.2017.10.008

隧道建设 >

2017 , Vol. 37 >Issue 10: 1255 - 1261

DOI: https://doi.org/10.3973/j.issn.1672-741X.2017.10.008

研究与探索

砂卵石地层地铁隧道上方基坑开挖卸载影响与对策分析

戴志仁 ,
王天明 ,
杜宇 ,
汪珂 ,
向阳

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（1. 中铁第一勘察设计院集团有限公司，陕西西安 710043； 2. 陕西省铁道及地下交通工程实验室, 陕西西安 710043）

戴志仁（1981—），男，江苏溧阳人，2010年毕业于同济大学，隧道及地下建筑工程专业，博士，高级工程师，主要从事城市轨道交通工程设计与研究方面的工作。Email： dzrzss@126.com。

收稿日期: 2017-06-20

修回日期: 2017-08-28

网络出版日期: 2017-10-26

基金资助

陕西省2016年度科学研究与发展计划（2016KCT-07）

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Influences of Unloading of Foundation Pit Excavation on Lower  Metro Tunnel in Sandygravel Strata and Its Countermeasures

DAI Zhiren ,
WANG Tianming ,
DU Yu ,
WANG Ke ,
XIANG Yang

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（1. China Railway First Survey & Design Institute Group Co., Ltd., Xi′an 710043, Shaanxi, China;  2. Key Laboratory of Shaanxi Railway and Underground Traffic Engineering, Xi′an 710043, Shaanxi, China）

Received date: 2017-06-20

Revised date: 2017-08-28

Online published: 2017-10-26

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摘要

在富水砂卵石地层条件下，地铁盾构隧道上方基坑大范围开挖卸载会对下卧盾构隧道产生不利影响。为确保地铁运营安全，对下卧盾构隧道隆起与变形趋势进行研究，从减小基坑开挖卸载的影响程度与增大隧道纵向刚度2方面着手，通过在盾构隧道内设置预应力锚索、轨道道床内设置暗梁结构并与管片叠合处理以及临时槽钢纵向固定等措施的综合应用，减小纵向不均匀变形趋势，同时采用管幕法超前支护形成压顶梁，并对上方基坑开挖采用“竖向分层、纵向分段、先支后挖”的基本原则，将盾构隧道的变形控制在毫米级范围，满足了地铁正常运营要求。

关键词： 砂卵石地层; 基坑开挖; 卸荷; 地铁隧道; 隧道管片; 预应力锚索; 叠合构件

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戴志仁 , 王天明 , 杜宇 , 汪珂 , 向阳 . 砂卵石地层地铁隧道上方基坑开挖卸载影响与对策分析[J]. 隧道建设, 2017 , 37(10) : 1255 -1261 . DOI: 10.3973/j.issn.1672-741X.2017.10.008

Abstract

The unloading of foundation pit excavation would affect the lower metro shield tunnel in waterrich and sandygravel strata. As a result, the deformation rules of the shield tunnel are studied in terms of reducing the influencing degree of unloading of foundation pit excavation on lower metro tunnel and increasing longitudinal stiffness of tunnel. The uneven longitudinal deformation of the tunnel is reduced by setting prestressed anchor rope in tunnel, setting hidden beam in the road bed and composited with segment and longitudinal fixing the Usteel. Meanwhile, the top beam is formed by advanced support of pipe curtain. The basic principle of vertical stratification, longitudinal segmentation and excavation after support is adopted for foundation pit excavation. The results show that the deformation of the tunnel has been effectively controlled and the normal operation of the metro has been guaranteed. 

Key words： sandygravel strata; foundation pit excavation; unloading; metro tunnel; tunnel segment; prestressed anchor rope; composite structure

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