Analysis of Train-induced Dynamic Response of Metro Tunnel in Saturated Foundation Based on the Wave Function Transformation Method
Journal Title: Urban Mass Transit - Year 2025, Vol 28, Issue 5
Abstract
[Objective] The train-induced metro tunnel vibration may affect adversely the normal life of residents along the line, the use of precision instruments, and the structural safety of ancient buildings. In order to clarify the propagation law of the entire process of train-induced metro tunnel vibration, analyze the implementation effects of various vibration isolation and reduction measures, it is necessary to establish an efficient calculation model for the train-induced dynamic response of metro tunnels. [Method] The Biot wave equation is used to simulate the vibration characteristics of the foundation, and the vibration equation of the double-layer thin-walled shell is used to simulate the vibration characteristics of the metro tunnel and the tunnel grouting layer. The transformation formula of the wave functions for plane and cylindrical waves is introduced to solve the basic solution of the dynamic response of the tunnel embedded in the half-space foundation. Based on the basic solution of the dynamic response of the foundation-tunnel, the Euler beam with continuous line support is used to simulate the track structure, and the multi-body dynamics model is used to simulate the vehicle load. Subsequently, the structures such as vehicles and tracks are further coupled, and an analytical calculation model for the train-induced dynamic response of metro tunnels is proposed. Based on this model, the vibration reduction effects of vibration reduction measures such as the floating slab track of the metro tunnel are analyzed. [Result & Conclusion] While exerting the vibration reduction effect, different vibration reduction measures will lead to an increase in the vibration response of some sub-structures of the system to a certain extent. When analyzing the vibration reduction of the system, the vibration reduction design should be carried out from the perspective of systemic safety to avoid damage caused by the local vibration amplification.
Authors and Affiliations
Huiji GUO
Keywords
Related Articles
- EP ID EP766706
- DOI 10.16037/j.1007-869x.2025.05.028
- Views 10
- Downloads 0
Land Subsidence Law of Subway Shield Tunnel Construction Under-Crossing Buildings Considering the Coupling Effect of Double-Line Tunneling and Building Structure
［Objective］ Ground deformation caused by double-line tunnels under-crossing building structures in urban soft soil stratum is relatively complex. It is necessary to study the influence of the coupling effect of double-...
Influence Analysis of Lateral Connection between Track Beams of Suspended Monorail Transit Large-Span Bridges
［Objective］ Generally, the left and right track beams of suspended rail transit work independently, and are only connected at the piers. The track beams in mid-span are not connected to each other, which has little eff...
Time Synchronization Scheme for Train FAO Signaling System
[Objective] Time synchronization is the foundation for ensuring the coordinated linkage of sub-systems within the signaling system, which directly affects the punctuality and operational safety of trains, serving as the...
Study on Flow Plasticity and Permeability of Mixture Conditioned Muck for Metro Shield Tunnel in Water-rich Sand Stratum
[Objective] When tunnel boring machine advancing in the water-rich sand layer, problems such as high cutter torque, serious wear and spout of the screw conveyer can be easily generated. In order to ensure the safety of c...
Analysis of Tunnel Face Stability Based on Upper Bound Method of Limit Analysis
［Objective］ During tunnel excavation, the reformation of a free surface ahead of the tunnel face due to soil removal necessitates the application of appropriate support pressure to ensure soil stability. Thus, it is ne...