Dynamic Response Analysis on Stress and Displacement of the Shield Tunnel Structure and Soil Layer under Train-Induced Vibration in Xiamen Metro Line 6

Abstract

Tunnel engineering develops rapidly. To study the dynamic response of shield tunnel structure and its bottom soil layer caused by metro train operation, a three-dimensional finite-difference dynamic calculation method is used to establish a shield tunnel-soil layer coupling model based on the shield tunnel project of Maluan Central Station-Jimei Island Station of Xiamen Metro Line 6, and the dynamic response of tunnel structure and its bottom soil layer caused by metro train operation is calculated. The results show that: Under the action of train-induced vibration, the shield tunnel structure mainly bears compressive stress and generates compressive deformation. The dynamic response of tunnel structure represents a significant increasing trend with the enhancement of train-induced vibration load. Under the same load strength, dynamic response change amplitude of structure is not obvious with tunnel structural stiffness, stress is gradually increasing, and displacement is weakening. The deeper the soil depth at the bottom of the shield tunnel structure, the weaker the dynamic response of the soil layer. The stress response of the soil layer at the same depth is increasing with the train-induced vibration load improving, but the displacement response has a stage characteristic. The dynamic response of the soil layer at the same depth does not change obviously with the increase in shield tunnel structural stiffness, but the stress response gradually increases, and the displacement response becomes weak. In general, investigation of the dynamic response of the subway shield tunnel under train-induced vibration has important practical significance for maintaining the long-term safe operation of subway tunnels.

Dynamic Response Analysis of a Fiber-Reinforced Polymer Reinforced Viaduct under Full Scale Moving Maglev Train Load

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“…where ξ n and ω n are, respectively, the nth mode damping ratio and the circular frequency of the girder, P vn (t) is the nth-order mode load of the moving vehicle forces. The nth-order response component in the frequency domain can then be defined by the Fourier transform of Equation (49).…”

Study of the Influence of Metro Loads on the Destruction of Nearby Buildings and Construction Structures Using Bim Technologies

“…As a result, it becomes possible to make a forecast of manmade factors -vibration sources that are already present or are just being designed, or will soon appear near existing buildings. Vibration waves that travel in the soil have a spatial nature and affect the bases and foundations initially and, subsequently, adjoining structures that make up the structure matrix due to their proximity to the metro and other logistical components that cause vibration and dynamic loads (Kril, 2008;Guo et al, 2022).…”

Dynamic Response of Bridge–Tunnel Overlapping Structures under High-Speed Railway and Subway Train Loads

“…In the numerical simulation, the pile foundation was simulated using the method of beam element pile interface, and due to the small difference in the soil properties of the formation, the interface parameters along the pile length were considered equal. The following empirical formulae were used for the calculation [14,26]:…”

“…Yang et al [13] applied the model test method to analyze the dynamic response characteristics of a tunnel under the vibration loading of a high-speed train and reported a significant difference in the dynamic effect of cross-sectional shapes on tunnels. Guo et al [14] investigated the dynamic response of a shield tunnel structure and soil under the train vibration of Xiamen Metro Line 6. Xu et al [15] studied the dynamic response of the pile-soil foundation of a closedistance tunnel under a high-speed train load and divided the tunnel into three zones based on the safety threshold: dangerous zone, strongly affected zone, and weakly affected zone.…”