Influence of extreme shallow jacked box tunnelling on underlying metro tunnels: A case study

IF 8.2 1区工程技术 Q1 ENGINEERING, CIVIL Underground Space Pub Date : 2023-10-01 DOI:10.1016/j.undsp.2023.04.001

Xiaobing Xu , Lei Tong , Zhuofeng Li , Xingwang Liu , Qi Hu , Hongbo Yao , Junyi Li

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Abstract

The application of jacked box tunnelling for underground passages has grown rapidly in recent years in China. In this study, the design of an extreme shallow jacked box tunnel traversing the underlying metro tunnels was introduced. An innovative additional soil filling above the ground surface was carried out to overcome the overlying-soil-carrying effect of the extreme shallow jacked box tunnelling. The structural safety of metro tunnels during the jacking process was analyzed through in-situ monitoring. It indicated that the overlying-soil-carrying effect was successfully alleviated. The metro tunnels generally showed horizontal displacement towards the receiving shaft, uplift and horizontal stretch during the jacking process. The stop of jacking machine in front of obstacles generally contributed to the decrease of horizontal displacement, uplift and horizontal stretch of metro tunnels. The largest horizontal displacement (1.3–1.6 mm), uplift (1.5 mm) and horizontal convergence (1.6–1.8 mm) generally occurred when the reception of jacking machine was completed, and they all met the requirement of 2 mm for this project. The design and construction of this shallow jacked box tunnel project could provide references for future similar projects.

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极浅顶箱式隧道开挖对地铁下伏隧道影响的实例研究

近年来，顶推箱形隧道在我国地下通道中的应用发展迅速。在本研究中，介绍了一种穿越地下地铁隧道的极浅顶推箱形隧道的设计。为了克服极浅顶推箱形隧道的覆土承载效应，在地表以上进行了创新的额外填土。通过现场监测，对地铁隧道顶进过程中的结构安全性进行了分析。结果表明，上覆土的持力效应得到了成功的缓解。地铁隧道在顶进过程中通常表现为向受力井的水平位移、隆起和水平拉伸。顶管机在障碍物前的停止通常有助于降低地铁隧道的水平位移、隆起和水平拉伸。最大的水平位移（1.3–1.6 mm）、隆起（1.5 mm）和水平收敛（1.6–1.8 mm）通常发生在顶升机接收完成时，它们都满足本项目2 mm的要求。该浅箱隧道工程的设计与施工可为今后类似工程提供借鉴。

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来源期刊

Underground Space ENGINEERING, CIVIL-

CiteScore

10.20

自引率

14.10%

发文量

审稿时长

63 days

期刊介绍： Underground Space is an open access international journal without article processing charges (APC) committed to serving as a scientific forum for researchers and practitioners in the field of underground engineering. The journal welcomes manuscripts that deal with original theories, methods, technologies, and important applications throughout the life-cycle of underground projects, including planning, design, operation and maintenance, disaster prevention, and demolition. The journal is particularly interested in manuscripts related to the latest development of smart underground engineering from the perspectives of resilience, resources saving, environmental friendliness, humanity, and artificial intelligence. The manuscripts are expected to have significant innovation and potential impact in the field of underground engineering, and should have clear association with or application in underground projects.