Factors Influencing Longitudinal Stability Analysis of Unit Slab Track on Subgrade

In the paper, a numerical mechanical model for the slab track was established. Under the condition of some longitudinal loads such as braking force and temperature load, the mechanical characteristics and the deforming rule of slab track were analyzed. The results indicated that the cam plate, the elastic modulus of colophony, the gap between the block and colophony affected the longitudinal displacement of track slab obviously. The inner forces and the displacement of track have been changed a little when the friction coefficient between the slab and CA mortar was varying from 0.25 to 1. While, the displacement of slab and colophony were both more than 2mm as the axial temperature loading of 10°C was applied on the slab, which leaded to the conclusion that temperature loading had the significant effect on the longitudinal displacement and inner force of track.