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A numerical analysis using a finite element program was performed on three structures:hot mix asphalt(HMA) reinforced trackbed(RACS-1),HMA directly supported trackbed(RACS-2),and traditional Portland Cement Concrete(PCC) slab track(SlabTrack).Although the comprehensive dynamic responses of RACS-1 were similar with SlabTrack,HMA layer can positively affect the stress distributions.In particular,the horizontal stresses indicate that the resilience of RACS-1 was improved relative to SlabTrack.In addition,HMA reinforced substructure has the capacity to recover the residual vertical deformation.The effective depth for weakening dynamic loadings is mainly from 0 to 2 m,this being especially true at 0.5 m.The results from the analysis show that HMA is a suitable material for the railway substructure to enhance resilient performance,improve the stress distribution,weaken dynamic loading,and lower the vibration,especially at the effective depth of 2 m.The HMA constructed at the top of the stone subbase layer allows the vertical modulus a smooth transition.In terms of the comprehensive dynamic behaviors,RACS-1 is better than SlabTrack,while the results for RACS-2 are inconclusive and require further research.
A numerical analysis using a finite element program was performed on three structures: hot mix asphalt (HMA) reinforced trackbed (RACS-1), HMA directly supported trackbed (RACS-2), and traditional Portland Cement Concrete (PCC) slab track Although the comprehensive dynamic responses of RACS-1 were similar to SlabTrack, HMA layer can positively affect the stress distributions.In particular, the horizontal stresses indicate that the resilience of RACS-1 was improved relative to SlabTrack.In addition, HMA reinforced substructure has the capacity to recover the residual vertical deformation. The effective depth for weakening dynamic loadings is mainly from 0 to 2 m, this is especially true at 0.5 m. The results from the analysis show that HMA is a suitable material for the railway substructure to enhance resilient performance, improve the stress distribution, weaken dynamic loading, and lower the vibration, especially at the effective depth of 2 m. The HMA constructed at the top of the stone subbase layer allows the vertical modulus a smooth transition. terms of the comprehensive dynamic behaviors, RACS-1 is better than SlabTrack, while the results for RACS-2 are inconclusive and require further research.