Research on interlayer relationship between asphalt concrete layer and support layer under ballastless track

doi:10.16265/j.cnki.issn1003-3033.2019.S1.023

Abstract

Abstract: In order to study the interlayer relationship and failure process between the full-section asphalt concrete layer and the support layer of ballastless track under temperature load, a numerical model is established for analysis. The surface-based CZM was used to describe the interlayer relationship between asphalt concrete layer and support layer. The interactions of different temperature and different support layer lengths were analyzed. Then, the interlayer damage of asphalt concrete layerand support layerwas analyzed throughout the process by choosing the most unfavorable working condition. The results show that the shear stress between the asphalt concrete layer and the support layer is the largest at the end and gradually decreases inward.The interlayer shear stress is the largest under the condition of low temperature and cooling, which is the most unfavorable condition.The increase of the length of support layer increases the interlayer shear stress and the possibility of interlayer damage. The interlayer damage of the asphalt concrete layer and the support layer starts from the position at the end of the plate, and the damage range gradually expands inward as the temperature decreases.

Key words: asphalt concrete layer, support layer, cohesive zone model(CZM), shear strength

CLC Number:

X935

LYU Song, XIAO Hong, CAI Degou. Research on interlayer relationship between asphalt concrete layer and support layer under ballastless track[J]. China Safety Science Journal, 2019, 29(S1): 126-133.

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