Analysis on Deformation of a Shallowcovered Asymmetricallypressured Tunnel Portal Section Located in Toppling Deformed Ground and Its Treatment

doi:10.3973/j.issn.1672-741X.2015.07.017

Tunnel Construction ›› 2015, Vol. 35 ›› Issue (7): 721-726.DOI: 10.3973/j.issn.1672-741X.2015.07.017

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Analysis on Deformation of a Shallowcovered Asymmetricallypressured Tunnel Portal Section Located in Toppling Deformed Ground and Its Treatment

WU Xuezhi¹, WANG Jian¹, YANG Baoquan², ZENG Tianwen¹

(1. Power China Chengdu Engineering Corporation Limited, Chengdu 611130, Sichuan, China;2. No. 2 Engineering Co., Ltd. of the Tenth Engineering Group Company of China Railway, Zhengzhou 476008, Henan, China)

Received:2014-10-09 Revised:2015-03-17 Online:2015-07-20 Published:2015-07-29

Abstract

Abstract:

The entrance portal section of a tunnel is located in toppling deformed ground and is shallowcovered and asymmetricallypressured. Two deformation incidents occurred during the construction of the portal section of the tunnel. In the paper, the causes for the deformation incidents are analyzed, and countermeasures such as muck piling, grouting and additional wiremeshing and shotcreting are taken. In the end, the deformation of the tunnel portal section has been brought under effective control and the possible tunnel collapse and landslide have been avoided. In the construction of the remaining tunnel section, the support parameters have been adjusted and the “threebench eightstep” construction method has been used innovatively. Finally, the tunnel has been completed successfully. 

Key words: tunnel portal, toppling deformation, shallow cover and asymmetrical pressure, bench method, deformation control

CLC Number:

U 455.4

WU Xuezhi, WANG Jian, YANG Baoquan, ZENG Tianwen. Analysis on Deformation of a Shallowcovered Asymmetricallypressured Tunnel Portal Section Located in Toppling Deformed Ground and Its Treatment[J]. Tunnel Construction, 2015, 35(7): 721-726.

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Analysis on Deformation of a Shallowcovered Asymmetricallypressured Tunnel Portal Section Located in Toppling Deformed Ground and Its Treatment

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