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Abstract

Because of the complicated construction sequence, alignment, and the disturbance of excavation to the surrounding rock, the excavation sequence and supporting structure of small-radius shallow buried spiral multi-arch tunnels in mountainous cities are always a difficult point in the design. Based on the finite difference software FLAC3D, this paper simulated the dynamic construction process of a small-radius shallow buried spiral multi-arch tunnel and analyzed the spatial effect of the excavation face, the interaction between the left and right tunnels, and the stability of the middle partition wall from different construction sequences and excavation steps. The results show that when the small-radius spiral multi-arch tunnel is excavated first, the disturbance to the surrounding rock is smaller near the main hole. When the spiral radius is 30 m, the optimal construction step of the left and right tunnels is 1.5B (B is the tunnel half-span width). During the construction of the first tunnel, the middle partition wall deflects to the first tunnel, and during the construction of the rear tunnel, the middle partition wall deflects to the back tunnel. The displacement perpendicular to the direction of the middle partition wall is the largest, so it is necessary to strengthen and support the middle partition wall during construction to prevent overturning. The calculation results have a certain reference value for the design of small-radius shallow buried spiral multi-arch tunnels in mountainous cities.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2022.06.029

First Page

157

Last Page

161

Submission Date

May 2025

Reference

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