Mechanical analysis method and anti-fracture design of shallow buried subway tunnels under normal fault dislocation

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (1) : 252-261.

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Mechanical analysis method and anti-fracture design of shallow buried subway tunnels under normal fault dislocation

GUO Wenyuan1, LI Shimin1, WANG Zhigang*2, GAO Tao1,3, TAO Lianjin2, XIE Lin1,LIU Jiangong2, LIU Huanan1

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Abstract

Seismic research shows that the damage of tunnels crossing active fault zones is extremely serious. In this paper, based on the project of Taiyuan City Urban Railway Line 1 Phase I Project, the interval tunnel crossing the Jiaocheng fault zone, the mechanical analysis model is established by Pasternak two-parameter foundation model, and the analytical solution of the longitudinal response of the underground pipeline under the positive fault is derived, and then the three-dimensional refined finite element model is established by ABAQUS software. The results of the analytical solution are in good agreement with the numerical simulation results, which proves the correctness of the analytical solution. Finally, the combination of segmental lining and flexible joints in the key protection zone is used to compare and analyse the effects of segment length, longitudinal position of joints and width of flexible joints on the overall disaster reduction effect of the tunnel structure. The results show that the results of the analytical solution of the longitudinal response of the underground pipeline under the fault movement can provide a reference for the determination of the key protection zone. The combination of segmental lining and flexible joints can effectively reduce the degree and extent of damage to the tunnel structure. The shorter the length of the tunnel section, the smaller the area of damage; increasing the width of the flexible joint will reduce the degree and extent of damage to the tunnel structure, and the damage area will be concentrated in the end part of the segmental lining structure. When the flexible joints are installed in the butt joint mode, the deformation and energy absorption of the joints can be maximised, and the disaster reduction effect is optimal. The study can provide a theoretical basis for the design and analysis of the fracture resistance design of tunnel projects crossing active fault zones using the combination of segmental + flexible joints.

Key words

Metro tunnel / Active fault zone / Analytical solution / Articulated tunnel / Numerical modelling / Break-resistant design

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GUO Wenyuan1, LI Shimin1, WANG Zhigang2, GAO Tao1, 3, TAO Lianjin2, XIE Lin1, LIU Jiangong2, LIU Huanan1. Mechanical analysis method and anti-fracture design of shallow buried subway tunnels under normal fault dislocation[J]. Journal of Vibration and Shock, 2025, 44(1): 252-261

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