01658366

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Worldwide application of asphalt layer in both ballast track and ballastless track is well documented in recent years, asphalt waterproof layer has also been successfully applied to the shoulder of slab track in China. To eliminate the potential threats of joint cracking, application of full cross-section asphalt waterproof layer (FCAWL) in CRTSIII slab track is numerically studied. Finite element model of standard CRTSIII slab track is firstly built and validated, then the models of new structures are developed by incorporating FCAWL of different thickness into the validated model, finally, transient analysis is performed to study the effects of FCAWL on the dynamic responses of the whole structure. The analysis results show that application of FCAWL in CRTSIII slab track obviously reduces vibration acceleration and dynamic deformation of both super-structure and sub-structure. However, it also increases the stress level of sub-structure at the same time. The effects increase with growing thickness of FCAWL, while for all thicknesses, the dominant tensile stress on the bottom of asphalt layer is much lower than the strength criteria of asphalt mixture. Further study on long-term performance as well as fatigue life is still needed for determination of the optimal thickness of FCAWL.

This paper was sponsored by TRB committee AR050 Standing Committee on Railroad Track Structure System Design.

18-03423

English

6p

2018

Transportation Research Board 97th Annual Meeting

Digital/other

Figures; References; Tables

Asphalt; Concrete slab track; Deformation; Finite element method; Numerical analysis; Tensile strength; Train track dynamics; Vibration

China

Design; Materials; Railroads

Transportation Research Board Annual Meeting 2018 Paper #18-03423

TRIS, TRB, ATRI

Jan 8 2018 10:50AM