Study on the Deformation Impact of Shield Tunnel Overpass Construction on Existing Operational Tunnels

DOI: https://doi.org/10.62517/jcte.202506313

Author(s)

Song Chen1, Zhenfeng Cao1, Dexin Liu2, Minglai Yang1,3,*

Affiliation(s)

1Faculty of Intelligence Technology, Shanghai Institute of Technology, Shanghai, China 2Shanghai ShenTong Rail Transit Research and Consultancy CO., LTD., Shanghai, China 3College Of Information Technology, Jilin Agricultural University, Changchun, China

Abstract

Based on a shield-driven metro tunnel section in Shanghai, this paper systematically investigates the deformation characteristics and influence mechanism of overcrossing existing operational tunnels using the shield tunneling method. A three-dimensional finite element model (MIDAS GTS NX) was established, and a staged construction simulation method was adopted to analyze the deformation response of the existing tunnel during shield advancement, as well as the influence of tail synchronous grouting thickness on deformation control. The results indicate that the vertical deformation induced by shield tunneling exhibits significant phasing and symmetry. The left tunnel crossing induces a single-peak uplift response, whereas the right tunnel crossing evolves into an "M-shaped" double-peak pattern, with the peak deformation points shifting approximately 2.4 m from the centerline of the existing tunnel. Moreover, appropriately increasing the synchronous grouting layer thickness can effectively reduce deformation and improve the ground support capacity, with a 0.20 m thickness showing optimal performance in terms of deformation control and cost-effectiveness. The findings provide theoretical and engineering guidance for deformation control and risk management during shield tunneling under complex underground conditions.

Keywords

Overcrossing Existing Tunnel; Vertical Deformation Pattern; Synchronous Grouting Thickness

References

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