Study on the mechanical performance and interface damage of CRTS II slab track with debonding repairment

In this work, the effect of the carrying-out debonding repairment on the mechanical performance and interface damage of China Railway Track System (CRTS) II slab track was studied. The bilinear cohesive zone model (CZM) based on the stress-displacement relationships for describing the interface behaviors of the debonding repaired CRTS II slab track was obtained through the experimental tests. A finite element model (FEM) of the CRTS II slab track incorporating the debonding repairment between the track-slab and the mortar layer was established, which was applied in the simulations under the vertical temperature gradient load. The results show that the temperature deformation of the track-slab could be well restored and no structural damage occurred under the vertical temperature gradient load. The damage only initiates and develops at the edge of the interface between the track-slab and the mortar layer (T-M interface) under the vertical positive temperature gradient. However, the evolutions of the maximum damage variable and the damage area indicate that the influence of the interface damage emerging at the T-M interface is relatively limited. (C) 2020 Elsevier Ltd. All rights reserved.