Retaining Technology for Deep Foundation Pit Excavation Adjacent to High-Speed Railways Based on Deformation Control

Considering the deep foundation pit of a car dumper room close to the Beijing–Baotou railway, the countermeasures of the foundation pit design are analyzed according to the surrounding environment and stratum conditions. Through Midas GTS software as well as field measured results, the construction...

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Autores principales:	Guohui Wang, Wenhua Chen, Liguo Cao, Youdong Li, Shuangchen Liu, Junchao Yu, Bingbing Wang
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	railway subgrade numerical analysis deformation retaining structure foundation pit Science Q
Acceso en línea:	https://doaj.org/article/3ce913e926f3499188d29b44199cbb09
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spelling	oai:doaj.org-article:3ce913e926f3499188d29b44199cbb092021-11-05T14:43:45ZRetaining Technology for Deep Foundation Pit Excavation Adjacent to High-Speed Railways Based on Deformation Control2296-646310.3389/feart.2021.735315https://doaj.org/article/3ce913e926f3499188d29b44199cbb092021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/feart.2021.735315/fullhttps://doaj.org/toc/2296-6463Considering the deep foundation pit of a car dumper room close to the Beijing–Baotou railway, the countermeasures of the foundation pit design are analyzed according to the surrounding environment and stratum conditions. Through Midas GTS software as well as field measured results, the construction effect on the adjacent railway subgrade is discussed. Therefore, the deformation characteristics of the foundation pit as well as the retaining structure, including the railway subgrade, caused by the excavation process, are revealed. The results show that the five-sided water-stop structure formed by cement piles around and at the bottom of the pit avoids the consolidation settlement of the adjacent railway subgrade caused by deep dewatering and also reduces the lateral displacement (i.e., in a horizontal direction) and the heave of the pit bottom. As a result, the lateral displacement near the railway side is larger than that of the retaining structure on the other side due to the subgrade on the pit side. The cross-lot bracing across the foundation pit will transfer the bias pressure of the subgrade to the retaining structure far away from the railway, while the transfer effect of the knee bracing is not obvious. The deformation of the railway subgrade and its evolution rate caused by the removal of internal bracing is significantly greater than the subgrade deformation and the change rate of deformation caused by excavation. The research results provide useful guidance for the deep foundation pit design.Guohui WangWenhua ChenLiguo CaoYoudong LiShuangchen LiuJunchao YuBingbing WangFrontiers Media S.A.articlerailway subgradenumerical analysisdeformationretaining structurefoundation pitScienceQENFrontiers in Earth Science, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	railway subgrade numerical analysis deformation retaining structure foundation pit Science Q
spellingShingle	railway subgrade numerical analysis deformation retaining structure foundation pit Science Q Guohui Wang Wenhua Chen Liguo Cao Youdong Li Shuangchen Liu Junchao Yu Bingbing Wang Retaining Technology for Deep Foundation Pit Excavation Adjacent to High-Speed Railways Based on Deformation Control
description	Considering the deep foundation pit of a car dumper room close to the Beijing–Baotou railway, the countermeasures of the foundation pit design are analyzed according to the surrounding environment and stratum conditions. Through Midas GTS software as well as field measured results, the construction effect on the adjacent railway subgrade is discussed. Therefore, the deformation characteristics of the foundation pit as well as the retaining structure, including the railway subgrade, caused by the excavation process, are revealed. The results show that the five-sided water-stop structure formed by cement piles around and at the bottom of the pit avoids the consolidation settlement of the adjacent railway subgrade caused by deep dewatering and also reduces the lateral displacement (i.e., in a horizontal direction) and the heave of the pit bottom. As a result, the lateral displacement near the railway side is larger than that of the retaining structure on the other side due to the subgrade on the pit side. The cross-lot bracing across the foundation pit will transfer the bias pressure of the subgrade to the retaining structure far away from the railway, while the transfer effect of the knee bracing is not obvious. The deformation of the railway subgrade and its evolution rate caused by the removal of internal bracing is significantly greater than the subgrade deformation and the change rate of deformation caused by excavation. The research results provide useful guidance for the deep foundation pit design.
format	article
author	Guohui Wang Wenhua Chen Liguo Cao Youdong Li Shuangchen Liu Junchao Yu Bingbing Wang
author_facet	Guohui Wang Wenhua Chen Liguo Cao Youdong Li Shuangchen Liu Junchao Yu Bingbing Wang
author_sort	Guohui Wang
title	Retaining Technology for Deep Foundation Pit Excavation Adjacent to High-Speed Railways Based on Deformation Control
title_short	Retaining Technology for Deep Foundation Pit Excavation Adjacent to High-Speed Railways Based on Deformation Control
title_full	Retaining Technology for Deep Foundation Pit Excavation Adjacent to High-Speed Railways Based on Deformation Control
title_fullStr	Retaining Technology for Deep Foundation Pit Excavation Adjacent to High-Speed Railways Based on Deformation Control
title_full_unstemmed	Retaining Technology for Deep Foundation Pit Excavation Adjacent to High-Speed Railways Based on Deformation Control
title_sort	retaining technology for deep foundation pit excavation adjacent to high-speed railways based on deformation control
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/3ce913e926f3499188d29b44199cbb09
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Retaining Technology for Deep Foundation Pit Excavation Adjacent to High-Speed Railways Based on Deformation Control

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