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International Journal of Railway Technology
ISSN 2049-5358
IJRT, Volume 6, Issue 1, 2017
A Numerical Study on Asphalt Layer Location in a Slab Track System for High-Speed Railways
M. Fang1, D. Park2, J.L. Singuranayo1 and J.G. Rose3

1School of Civil Engineering and Architecture Wuhan University of Technology, Wuhan, China
2Department of Civil Engineering, Kunsan National University Miryong-dong, Kunsan, Jeonbuk, 54150, South Korea
3Department of Civil Engineering, University of Kentucky Lexington, United States of America

Full Bibliographic Reference for this paper
M. Fang, D. Park, J.L. Singuranayo, J.G. Rose, "A Numerical Study on Asphalt Layer Location in a Slab Track System for High-Speed Railways", International Journal of Railway Technology, 6(1), 23-39, 2017. doi:10.4203/ijrt.6.1.2
Keywords: high-speed railways, asphalt concrete, substructure, ballastless trackbed, slab track, finite element method, numerical analysis.

Summary
This paper presents a quick but effective selection of the potential location for an asphalt layer implementation in a slab track system via three-dimensional numerical analysis. Based on the finite element method (FEM), one reference model with a traditional slab track (S0) and four proposed models, with an asphalt layer in different locations of slab track (S1, S2, S3, and S4), were established, followed by the reasonability verification using test data from literature. During the modelling, the bottom and the top of graded crushed stone, and the bottom of cement base, as well as the cement slab, were replaced by a certain thickness of dense and coarse asphalt mixture, respectively. The vertical acceleration and the deflection on the top of the improved subgrade layer, as well as the transversal and longitudinal tensile strain on the bottom of the asphalt layer, were the recommended mechanical parameters for structural evaluation. The results showed that the top of crushed stone replaced by the asphalt layer (S2) is the recommended solution of the asphalt layer installed in the slab track system. Meanwhile, the slab track directly installed on the asphalt layer (S4) is also a good direction for future research on asphalt slab tracks. An aggregate gradation with NMAS = 25 mm has also been recommended in this research.

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