Field Test Optimization of Shield Tunnelling Parameters Undercrossing an Existing High-Speed Railway Tunnel: A Case Stud
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ORIGINAL PAPER
Field Test Optimization of Shield Tunnelling Parameters Undercrossing an Existing High-Speed Railway Tunnel: A Case Study Zhen Huang . Hai Zhang . Zhen Long . Wenge Qiu . Guowang Meng . Lianchen Zhu
Received: 21 July 2020 / Accepted: 7 September 2020 Ó Springer Nature Switzerland AG 2020
Abstract An existing high-speed railway tunnel undercrossed by shield tunnelling is a high-risk project. Selecting reasonable shield tunnelling parameters is key in controlling the deformation of existing high-speed railway tunnels. In this paper, a Metro Line 3 undercross of an existing high-speed railway tunnel project is taken as the research background. First, a shield section with similar geological conditions as the undercross section is selected as the test section. Then, reasonable shield tunnelling parameters are determined by monitoring the settlement values of surface and ground structures in the test section. Finally, combined with the monitoring results of vertical soil displacement, the reliability of the shield tunnelling parameters is verified. After the completion of shield tunnelling in the test section, there is no void behind the shield tunnel wall, and the monitoring results of the Z. Huang H. Zhang G. Meng (&) College of Civil Engineering and Architecture, Key Laboratory of Disaster Prevention and Structural Safety, Guangxi University, Nanning 530004, China e-mail: [email protected] Z. Huang e-mail: [email protected] Z. Long L. Zhu China Railway 25th Bureau Group 5th Engineering Co., Ltd, Guangzhou 510600, China W. Qiu School of Civil Engineering, Southuest Jiaotong Univerity, Chengdu 610031, China
vault settlement and segment posture in the tunnel meet the control values in the specification, which further support the rationality of the tunnelling parameters. In the process of shield tunnelling the undercross of the existing high-speed railway tunnel, the monitoring results of overall tunnel settlement, bottom uplift point settlement, track settlement, and track height difference meet the control values in the specification, which effectively avoids the adverse impacts of the shield tunnelling undercross of the existing high-speed railway tunnel and ensures the safety of the existing tunnel. Keywords Shield tunnel Tunnelling parameters Field test High-speed railway tunnel Undercross construction Settlement deformation
1 Introduction Shield tunnelling is the most common method for the construction of urban subway tunnels. At the same time, it is difficult for shield tunnelling to avoid disturbances to the stratum, especially when shield tunnelling parameters (including silo pressure, total thrust of shield, cutter-head torque, cutter-head speed, shield tunnelling speed, slag discharge, synchronous grouting volume, and grouting pressure) are poorly controlled, and this method can easily cause disturbance and damage to the surrounding environment
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Geotech Geol Eng
(Hu et al. 2020; Li et al. 2020). Therefore, it is important to
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