Dynamic analysis of water-rich heavy haul railway tunnels considering basement defects evolution and train effects

• DOI: 10.1007/s40534-024-00360-6
• Publication Date: 2025-01-10T18:26:02Z
• Authors: Zhu Peng; Chenghua Shi; Zixu Zhu; Lei Xu; Cong Liu; Mingfeng Lei
• Keywords: Basement

Abstract With the rapid development of heavy haul railway transportation technology, tunnel foundation defects and their effects on structural performance have attracted wide attention. This paper systematically investigates evolution mechanism in tunnels impact stiffness degradation through experiments numerical simulations. A train–ballasted track–tunnel basement–surround rock dynamic interaction model (TTTR model) is constructed. Firstly, study reveals four-stage process initial basement under complex environmental conditions. Experiments were conducted to measure load-bearing capacity structure different defect states. It found that defects, especially coupling loose fill with water-rich environment surrounding rock, significantly reduce bottom increase risk damage. Then, based refined simulation wheel–rail multi-scale coupled modeling TTTR was successfully constructed, its validity proven validation. time-varying technique constrained boundary substructures (CBS technique) adopted, improving computational efficiency while ensuring calculation accuracy. The also analyzes degrees void behavior train characteristics structure. finds a significant train’s operational state, track vibration displacement, stress lining structure, effect voids environment, which has greatest impact. research results this provide theoretical basis technical support for maintenance reinforcement structures.