Performance of the suspension method in large cross-section shallow-buried tunnels

Cai, Guoqing, Zou, Xinxiang, Zhang, Qiang, Yang, Rui, Wu, Tianchi and Li, Jiguang 2023. Performance of the suspension method in large cross-section shallow-buried tunnels. High-speed Railway 1 (4) , pp. 224-232. 10.1016/j.hspr.2023.11.002

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Abstract

Large cross-section tunnel construction induces ground surface settlements, potentially endangering both subterranean projects and nearby above-ground structures. A novel tunnel construction method, known as the suspension method, is introduced in this paper to mitigate surface settlement. The suspension method employs vertical tie rods to establish a structural connection between the initial tunnel support system and the surface steel beam, thereby exerting effective control settlements. To analyze the performance of the proposed method, systematic numerical simulations were conducted based on the practical engineering of Harbin Subway Line 3. The surface settlement and vault settlement characteristics during construction are investigated. The results show a gradual increment in both surface and vault settlement throughout the construction process, culminating in a stabilized state upon the completion of construction. In addition, compared to the double-side drift method and the Cross Diaphragm Method (CRD) method, the suspension method can obviously reduce the surface settlement and vault settlement. Moreover, the surface settlements and the axial force of tie rods were continuously monitored during the construction process at the trial tunnel block. These specific monitoring measurements are illustrated in comparison to numerical analysis results. The monitored results show great agreement with the numerical predictions, confirming the success of the project. This research can serve as a valuable practical reference for similar projects, offering insights and guidance for addressing ground surface settlements and enhancing construction safety in the domain of large cross-section tunneling.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Additional Information:	License information from Publisher: LICENSE 1: URL: http://creativecommons.org/licenses/by-nc-nd/4.0/, Start Date: 2023-11-22
Publisher:	Elsevier
ISSN:	2949-8678
Date of Acceptance:	6 November 2023
Last Modified:	02 Jan 2024 17:45
URI:	https://orca.cardiff.ac.uk/id/eprint/165160

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