Effect of Embedded Steel Bars Under Longitudinal Temperature Deformation on Track Slab

Abstract:

The longitudinal deformation of track slab under temperature load leads to the deviation of anchor reinforcement， which could lead to differences in the structural stress state from the design intention. To clarify the actual effect of planting reinforcement， first， the temperature deformation of longitudinal slab ballastless track was monitored， which quantitatively represented the actual deviation of anchor reinforcement. Then， the refined finite element model of embedded reinforcement anchorage of ballastless track was established， which was used to analyze the damage law of embedded reinforcement layer under different deflection conditions. Finally， the actual embedded steel bars effect of ballastless track under the coupling of anchorage reinforcement deviation and debonding was clarified. The results show that the longitudinal deformation of track slab could reach 0.946 mm. The offset of the anchor reinforcement aggravates the damage of the rubber layer of the embedded reinforcement， which is the main reason for the degumming failure of the anchor system. The damage evolution of the embedded rubber layer is vertical from top to bottom. The debonding failure between the embedded reinforcement layer and the track slab weakens the ability of the anchorage system to resist high-temperature camber deformation. When the debonding depth exceeds 200 mm， the camber of the track slab increases by 137.18%. In the evaluation of the actual effect of the embedded steel bars on ballastless tracks， it is necessary to consider the longitudinal temperature deformation of the track slab and dynamically adjust the actual maintenance plans.