Influence of Material Parameters on Interface Damage of CRTSⅡ Slab Ballastless Track under Temperature Load

Abstract

During the construction and service of high-speed railway slab ballastless track, the structural material parameters may change, which is quite different from its engineering design values. At present, there is still a lack of in-depth research on the impact of this change on the damage of the interface between the track slab and the mortar layer. In this paper, the finite element model of CRTS II slab ballastless track is established. Cohesive force model is used to simulate the damage behavior of the interface. The influence of the elastic modulus of the track slab, the elastic modulus of the mortar layer and the interfacial bonding strength on the damage of the interface between the track slab and the mortar layer under the extreme temperature gradient load of 90 C/m is analyzed. The results show that the influence of elastic modulus of track slab and mortar layer on the interface damage is basically the same. High elastic modulus deteriorates the interface stress and will increase the interface damage degree and damage area. The interfacial bonding strength has a significant effect on the interfacial damage. When the bonding strength is less than its design value, the interfacial damage rapidly deteriorates with the decrease of the bonding strength.