Prefabricated Structure of SuperLarge
CrossSection OpenCut Tunnel
and&nbsp;Its
Construction Method

LIN Zhi; FENG Wanlin; CHEN Xiang; HAI Dapeng; HE Tingquan; YANG Hongyun

doi:10.3973/j.issn.2096-4498.2022.07.005

Tunnel Construction >

2022 , Vol. 42 >Issue 7: 1167 - 1176

DOI: https://doi.org/10.3973/j.issn.2096-4498.2022.07.005

Prefabricated Structure of SuperLarge CrossSection OpenCut Tunnel and Its Construction Method

LIN Zhi ,
FENG Wanlin ,
CHEN Xiang ,
HAI Dapeng ,
HE Tingquan ,
YANG Hongyun

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(1. State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University,
Chongqing 400074, China; 2. China Construction Seventh Engineering Division Co., Ltd., Zhengzhou 450003, Henan, China； 3. Guangxi Xinfazhan Communication Group Co.， Ltd., Nanning 530029, Guangxi, China)

Online published: 2022-08-04

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Abstract

The prefabricated structure construction technology of opencut tunnels is not mature in China. Thus, the prefabricated structural system and construction methods of a superlarge crosssection opencut tunnel on Xinsen avenue in Chongqing, China, are being studied to improve the construction quality of tunnel projects. Then, a prefabricated structural system that integrates full prefabrication, castinplace invert, and prefabricated upper structure suitable for opencut highway and municipal large crosssection tunnels is established, and the suggested structure thickness and multilayer waterproof structure scheme are proposed. The analytical and numerical simulation findings reveal the following: (1) The structural mechanical response analysis results of the foursegmentation scheme in castinplace invert and prefabricated upper structures show that the structural stress, displacement, and opening angle of the joints meet relevant requirements and have a certain safety reserve. (2) A prefabricated opencut tunnel construction method with a superlarge crosssection, i.e., sidewall installation, castinplace invert, assemble crown, detailed operation, and soil backfilling, is provided.

Key words： superlarge crosssection opencut tunnel; prefabricated structure; prefabricated construction; opencut structure system

Cite this article

LIN Zhi , FENG Wanlin , CHEN Xiang , HAI Dapeng , HE Tingquan , YANG Hongyun .

Prefabricated Structure of SuperLarge CrossSection OpenCut Tunnel and Its Construction Method

[J]. Tunnel Construction, 2022 , 42(7) : 1167 -1176 . DOI: 10.3973/j.issn.2096-4498.2022.07.005

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