Effect of Excavation Sequence on Uplift Deformation of Underlying Existing Metro Tunnel
Publication: Journal of Performance of Constructed Facilities
Volume 35, Issue 2
Abstract
Although an appropriate excavation sequence contributes to minimizing the excavation-induced impact on the underlying existing tunnel, few studies have focused on the comparison of the excavation sequence for engineering projects in practice. In this paper, the numerical simulations based on FLAC3D were carried out to discuss the excavation-induced impact on the underlying existing tunnel, and the numerical results were analyzed in combination with the field data through a case history. The influence of different excavation sequences on the underlying tunnel was interpreted in comparison with the practical construction process. The results show that the excavation directly above the existing tunnel is the main cause of the uplift deformation of the underlying tunnel and that the soil above both sides of the tunnel should be excavated preferentially. The timely application of the foundation pit floor structure, together with the uplift piles and isolated piles, forms a door-frame structure that can effectively suppress the uplift deformation of the underlying tunnel after the excavation directly above the tunnel.
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Data Availability Statement
Some or all data, model, or code generated or used during the study are available from the corresponding author by request (some numerical simulation data).
Acknowledgments
The majority of the work presented in this paper was funded by the National Natural Science Foundation for Surface Project of China (Grant Nos. 51878157 and 41572273) and the Jiangsu Natural Science Foundation (Grant No. BK20181282). These financial supports are gratefully acknowledged.
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Published In
Journal of Performance of Constructed Facilities
Volume 35 • Issue 2 • April 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Sep 16, 2019
Accepted: Oct 29, 2020
Published online: Jan 30, 2021
Published in print: Apr 1, 2021
Discussion open until: Jun 30, 2021
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