Work

Numerical study of the dynamic responses of precast epoxy asphalt cured track (PEACT) transition zone

Year: 2025

Type: article

Abstract: • A validated FE model for DREAMs in the PEACT transition zone is established and validated. • The effectiveness of crumb rubber for vibration reduction is demonstrated. • Dynamic responses of a typical graded DREAM configuration in PEACT transition zone are characterized. • A design-ready guide on layout, damping, and modeling settings for PEACT transition zone is provided The rapid advancement of high-speed railway (HSR) has imposed significantly higher demands on rail tracks' performance and vibration mitigation capabilities, necessitating the design of track systems that can withstand extreme operational conditions while ensuring passenger comfort. Precast epoxy asphalt-cured track (PEACT) has emerged as a promising solution, offering superior mechanical properties and environmental adaptability. In this study, a full-scale finite-element model of PEACT is established and validated. Four dry-mixed rubberised epoxy asphalt mixtures (DREAMs) are incorporated, with their material parameters (e.g., modulus, density, damping) explicitly defined. Several modelling enhancements are implemented beyond conventional response analysis, including: (i) DREAM-grade-specific Rayleigh damping calibration derived from modal analysis, (ii) a stability-first boundary–mesh prescription. These strategies improve modelling fidelity for non-uniform transition zones. The results show that PEACT dynamic responses remain within acceptable ranges, and that DREAMs provide substantial vibration attenuation, contributing an additional ∼40% reduction on top of the fastener system. From a design perspective, these findings provide practical evidence that graded DREAM layouts can effectively control vertical surface displacement to below 0.5 mm under 350 km/h loading, facilitating smoother stiffness transitions, reduced maintenance demand, and more reliable HSR operation.

Source: Results in Engineering

DOI: 10.1016/j.rineng.2025.108453

Authors: You Wu, Chenguang Shi, Yunhong Yu, Yulou Fan, Jun Yang

Institutions: Delft University of Technology, Chongqing Jiaotong University, Southeast University

Language: English

Topic: Railway Engineering and Dynamics

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Industry, innovation and infrastructure, Sustainable cities and communities

Open Access status: gold

Estimated APC paid: $1,940