淤泥填海地层盾构近距穿越既有隧道变形控制

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (1325 KB) HTML (0 KB)
Export: BibTeX | EndNote (RIS)

Abstract Research purposes: This study aims to ensure deformation control of a newly constructed shield tunnel crossing above an existing tunnel with short distance in silt reclamation stratum during both construction and operational phases. Based on the construction case where Line 5 of the Shenzhen Metro crossing above Line 11, a series of numerical simulations were employed to evaluate different soft stratum reinforcement schemes. Consequently, the corresponding deformation control strategies were proposed, and the effectiveness of the reinforcement scheme was verified through deformation monitoring during the construction process.
Research conclusions: (1) The reinforcement scheme of the ground jet grouting pile based on improving the long-term anti-deformation ability of tunnels is proposed. It shows that the effect of the increase of the width on the horizontal convergence of the tunnel is not obvious when the reinforcement width is greater than 5 m. (2) Compared with the unreinforced case, the floating deformation of existing underlying tunnels and surface settlement are reduced by 44% and 86% after reinforcement, respectively, which can meet the deformation control requirements during the construction period. (3) The measured data of the construction period shows that the maximum floating deformation of existing tunnels is 3.2 mm, and the maximum surface settlement along the line is 5 mm, which meets the deformation control requirements, indicating that the proposed stratum reinforcement measures are effective. (4) The research results have certain reference significance for the construction of shield tunneling crossing existing projects in silt reclamation stratum.

Key words： silt reclamation stratum shield tunnel short-distance crossing deformation control high-pressure jet grouting pile

Received: 27 June 2022

PACS:

U25

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	ZHANG Wenlong
	LIU Hua
	HU Yazhou
	LIU Renpu
	TAN Qianyuan
	XIE Nan
	YE Weitao

Cite this article:

ZHANG Wenlong,LIU Hua,HU Yazhou, et al. Deformation Control of Shield Short-distance Crossing Existing Tunnels in Silt Reclamation Stratum[J]. Journal of Railway Engineering Society, 2024, 41(9): 87-91.

URL:

https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2024/V41/I9/87

[1]	张飞. 新建隧道下穿高铁路基施工过程稳定性分析[J]. 铁道工程学报, 2022(5):53-58.Zhang Fei.Stability Analysis of Construction Process of New Tunnel Passing through High-speed Railway Foundation[J]. Journal of Railway Engineering Society, 2022(5):53-58.
[2]	张庆闯,戴志仁,时亚昕,等. 新建隧道近接穿越既有运营地铁隧道关键技术[J]. 铁道工程学报, 2020(6):58-63.Zhang Qingchuang, Dai Zhiren, Shi Yaxin, etc. Key Technologies for Newly-built Tunnel Tunnelling through Operated Tunnel[J]. Journal of Railway Engineering Society, 2020(6):58-63.
[3]	Zhang Z, Zhang M, Zhao Q.A Simplified Analysis for Deformation Behavior of Buried Pipelines Considering Disturbance Effects of Underground Excavation in Soft Clays[J]. Arabian Journal of Geosciences, 2015(10):7771-7785.
[4]	黎高辉. 地铁工程空间交叠隧道加固及施工技术研究[J]. 工程建设, 2017(8):60-64.Li Gaohui.Study on Construction Technology and Scheme of Overlapped Tunnel of Subway Engineering[J]. Engineering Construction, 2017(8):60-64.
[5]	李凯梁. 新建隧道上穿工程对既有地铁隧道纵向隆起变形影响研究[D]. 哈尔滨:哈尔滨工业大学, 2017.Li Kailiang.Study on Effects of Longitudinal Heave Deformation of Existing Metro Tunnel Due to Construction of Up-crossing New Tunnel[D]. Harbin:Harbin Institute of Technology, 2017.
[6]	Do N A, Dias D, Oreste P, etc. Three-dimensional Numerical Simulation of a Mechanized Twin Tunnels in Soft Ground[J]. Journal of Zhejiang University Science A, 2014(11):896-913.
[7]	孙玉永,周顺华,向科,等. 近距离下穿既有隧道的盾构施工参数研究[J]. 中国铁道科学, 2010(1):54-58.Sun Yuyong, Zhou Shunhua, Xiang Ke,etc. Study on the Construction Parameters of Shield Tunneling in Short-Distance Undercrossing the Existing Tunnel[J]. China Railway Science,2010(1):54-58.
[8]	何春,张栲,周诚.地铁盾构隧道管片结构应力可视化监测技术[J]. 铁道工程学报, 2014(11):104-110.He Chun, Zhang Kao, Zhou Cheng.Visual Monitoring Technology for Structure Stress of Metro Shield Tunnel[J]. Journal of Railway Engineering Society, 2014(11):104-110.
[9]	CJJ/T 202—2013,城市轨道交通结构安全保护技术规范[S].CJJ/T 202—2013, Technical Code for Protection Structures of Urban Rail Transit[S].