A construction strategy for a tunnel with big deformation

By integrating literature reviews, site observa- tion, field monitoring, theoretical analysis, summarization, etc., a construction strategy was proposed and verified for tunneling with big deformation in this paper. The tunnel was in phyllite, shotcrete cracks and steel arch distortion were observed...

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Bibliographic Details
Published in:Journal of modern transportation 2013-06, Vol.21 (2), p.86-94
Main Authors: Chen, Liang, Chen, Shougen, Tan, Xinrong
Format: Article
Language:English
Subjects:
Automotive Engineering
Construction
Construction specifications
Deformation
Engineering
Foundations
Geoengineering
Hydraulics
Laboratory tests
Monitoring
Regional/Spatial Science
Rock
Rocks
Strategy
Theoretical analysis
Tunneling
Tunnels (transportation)
大变形
岩石变形
岩石强度
建筑
文学评论
混凝土裂缝
现场监测
隧道建设
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Summary:By integrating literature reviews, site observa- tion, field monitoring, theoretical analysis, summarization, etc., a construction strategy was proposed and verified for tunneling with big deformation in this paper. The tunnel was in phyllite, shotcrete cracks and steel arch distortion were observed, and a big deformation with a maximum of 2.0 m was monitored during the initial stage of the construction. Through carefully examining the site observation and laboratory test results, a construction principle was established for the tunneling on the basic concept of maintaining the rock strength/stiffness and keeping the rock dry, by providing confinement pressure to the rock, reducing the rock exposure time, keeping water out of the tunnel, etc. To achieve the construction principle, a set of specific construction measures with 11 items was further proposed and applied to the construction. To check the effectiveness of the construction measures, field monitoring was carried out, which showed that the rock deformation was well controlled and the tunnel became stable. An allowable deformation was then determined using the Fenner formulae and the monitored data in order to guide further construction, which received a good result. From this study, it can be concluded that providing quick strong initial support and reserving core soil at the working faceare extremely important to control the rock deformation and keep the tunnel stable.
ISSN:2095-087X
2662-4745
2196-0577
2662-4753
DOI:10.1007/s40534-013-0014-y