A Novel Excavation and Construction Method for an Extra-Long Underwater Tunnel in Soft Soils

The cut-and-cover technique is widely used in the field of tunnel engineering owing to its simple construction technology, high working efficiency, and low cost. However, the safety of the foundation pit and the environmental impact during excavation are of great concern, especially for tunnels that...

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Autores principales:	Jian Wu, Zhifang Zhou, Wenjun Xia, Haixiao Wang, Zhongqiang Fang
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/c4cff8bbf5a244e19fe8725a386cdbc2
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spelling	oai:doaj.org-article:c4cff8bbf5a244e19fe8725a386cdbc22021-11-29T00:57:08ZA Novel Excavation and Construction Method for an Extra-Long Underwater Tunnel in Soft Soils1687-809410.1155/2021/6184411https://doaj.org/article/c4cff8bbf5a244e19fe8725a386cdbc22021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/6184411https://doaj.org/toc/1687-8094The cut-and-cover technique is widely used in the field of tunnel engineering owing to its simple construction technology, high working efficiency, and low cost. However, the safety of the foundation pit and the environmental impact during excavation are of great concern, especially for tunnels that pass through lakes and/or rivers. In this paper, a novel excavation and construction method is presented for the Taihu tunnel, which is the longest lake-crossing tunnel in China. In this method, a cofferdam of double-row steel sheet piles (DSSPs) was designed in order to divide the overlying excavation into several closed zones. During the construction, four zones were regarded as a unit, and different construction steps were carried out simultaneously in each zone. Therefore, an assembly line for the tunnel excavation was established to accelerate the construction speed. The most distinctive advantage of this method is that the excavation did not cut off the normal flow of the lake water and the shipping routes, with low environmental impact. To investigate the tunnel deformation during excavation, a finite element analysis combined with field monitoring data was adopted, indicating that the magnitude of the tunnel deformation was notably less than those reported from other excavation projects. Moreover, the effect of groundwater on the piles and the safety of the foundation pit was revealed using numerical modelling. This study provides a new idea for the design and construction of tunnel engineering, especially for extra-long underwater tunnels in soft deposits.Jian WuZhifang ZhouWenjun XiaHaixiao WangZhongqiang FangHindawi LimitedarticleEngineering (General). Civil engineering (General)TA1-2040ENAdvances in Civil Engineering, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Engineering (General). Civil engineering (General) TA1-2040 Jian Wu Zhifang Zhou Wenjun Xia Haixiao Wang Zhongqiang Fang A Novel Excavation and Construction Method for an Extra-Long Underwater Tunnel in Soft Soils
description	The cut-and-cover technique is widely used in the field of tunnel engineering owing to its simple construction technology, high working efficiency, and low cost. However, the safety of the foundation pit and the environmental impact during excavation are of great concern, especially for tunnels that pass through lakes and/or rivers. In this paper, a novel excavation and construction method is presented for the Taihu tunnel, which is the longest lake-crossing tunnel in China. In this method, a cofferdam of double-row steel sheet piles (DSSPs) was designed in order to divide the overlying excavation into several closed zones. During the construction, four zones were regarded as a unit, and different construction steps were carried out simultaneously in each zone. Therefore, an assembly line for the tunnel excavation was established to accelerate the construction speed. The most distinctive advantage of this method is that the excavation did not cut off the normal flow of the lake water and the shipping routes, with low environmental impact. To investigate the tunnel deformation during excavation, a finite element analysis combined with field monitoring data was adopted, indicating that the magnitude of the tunnel deformation was notably less than those reported from other excavation projects. Moreover, the effect of groundwater on the piles and the safety of the foundation pit was revealed using numerical modelling. This study provides a new idea for the design and construction of tunnel engineering, especially for extra-long underwater tunnels in soft deposits.
format	article
author	Jian Wu Zhifang Zhou Wenjun Xia Haixiao Wang Zhongqiang Fang
author_facet	Jian Wu Zhifang Zhou Wenjun Xia Haixiao Wang Zhongqiang Fang
author_sort	Jian Wu
title	A Novel Excavation and Construction Method for an Extra-Long Underwater Tunnel in Soft Soils
title_short	A Novel Excavation and Construction Method for an Extra-Long Underwater Tunnel in Soft Soils
title_full	A Novel Excavation and Construction Method for an Extra-Long Underwater Tunnel in Soft Soils
title_fullStr	A Novel Excavation and Construction Method for an Extra-Long Underwater Tunnel in Soft Soils
title_full_unstemmed	A Novel Excavation and Construction Method for an Extra-Long Underwater Tunnel in Soft Soils
title_sort	novel excavation and construction method for an extra-long underwater tunnel in soft soils
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/c4cff8bbf5a244e19fe8725a386cdbc2
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A Novel Excavation and Construction Method for an Extra-Long Underwater Tunnel in Soft Soils

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