Comparative analysis on dynamic behavior of two HMA railway substructures
Mingjing FANG1,2, Yanjun QIU2, Jerry G. ROSE3, Randy C. WEST1, Changfa AI2*
1. National Center for Asphalt Technology (NCAT), College of Engineering, Auburn University, Auburn, AL 36830-5577, USA;
2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;
3. College of Engineering, Civil Engineering Department, University of Kentucky, Lexington, KY 40506-0281, USA
Abstract 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.
This paper is supported by NSFC project (No.50978222). The authors would like to thank Prof.Yongxing Wei for his assistance. Also, Ms. Rachel Nichols of University of Kentucky and Mr. Bill Minor of Auburn University are acknowledged for editing this draft and providing many useful suggestions.
Cite this article:
Mingjing FANG, Yanjun QIU, Jerry G. ROSE, Randy C. WEST, Changfa AI.Comparative analysis on dynamic behavior of two HMA railway substructures[J] JMT, 2011,V19(1): 26-34
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