Security analysis of dismantling temporary supports of large-span shallow tunnel in upper-soft and lower-hard stratum

LIU Tao; ZHAO Song-zhuang; SUN Fu-feng

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Security analysis of dismantling temporary supports of large-span shallow tunnel in upper-soft and lower-hard stratum

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- Security analysis of dismantling temporary supports of large-span shallow tunnel in upper-soft and lower-hard stratum
- Vol. 35, Issue S1, (2014)
- 作者机构：
  
  1. 中国海洋大学环境科学与工程学院,山东,青岛,266100
  2. 青岛地铁集团有限公司,山东,青岛,266000
- 作者简介：
- 基金信息：
- DOI：
  CLC： U451
- Online First：20 June 2014，
  
  Published：2014
- 稿件说明：
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LIU Tao, ZHAO Song-zhuang, SUN Fu-feng. Security analysis of dismantling temporary supports of large-span shallow tunnel in upper-soft and lower-hard stratum[J]. 2014, 35(S1).
DOI：

LIU Tao, ZHAO Song-zhuang, SUN Fu-feng. Security analysis of dismantling temporary supports of large-span shallow tunnel in upper-soft and lower-hard stratum[J]. 2014, 35(S1). DOI：

摘要

对于复合式衬砌隧道，初支受力最危险的时期就是为保证二次衬砌的完整性而分段拆除临时支撑的阶段。依托青岛地铁某暗挖车站，采用现场实测数据分析和数值模拟相结合的方法，对比拆撑前后围岩与初支变形情况，进而对6 m范围内交替拆撑，并以6 m为工作单元间隔拆撑的拆撑方案安全性进行分析。实测数据表明，地表沉降、拱顶沉降及净空收敛在拆撑前后增长量及影响均较小，数值计算结果与实测数据吻合较好，可知初支的安全性受支撑拆除的影响较小。研究结论为实现信息化施工提供了依据，也为今后类似工程积累了相关经验。

Abstract

For composite lining tunnel

initial liner is the most dangerous when temporary supports are dismantled before construction of second-layer liner. A project example of Qingdao metro is introduced. Using in-situ monitoring and numerical simulation

this paper contrasted deformation of rock and initial liner before and after dismantling temporary supports. Security of dismantling temporary supports is analyzed. Measured data show that volume growth and growth rate of displacement are small. Displacement results of numerical simulation are well consistent with measured data. The results show that the security of initial liner is little influenced by dismantling temporary supports. As a result

this study provides evidence for information-oriented construction of tunnel as well as experience for the future related projects.

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