Stress and Deformation Characteristics of Anchorage Structure behind Abutment of Longitudinally Connected Slab Ballastless Track under Temperature Load

Based on the software ANSYS, the three-dimensional finite element model considering bridge, track structure, anchorage structure and subgrade was established. The deformation of the anchorage structure behind the abutment of longitudinally connected slab track under temperature load was studied. Results show that when the temperature of the anchorage structure rises from 0 ℃ to 20 ℃, the longitudinally displacement exceeds the design limit (3.0 mm) and reaches 3.7 mm, which causes the void of the interface between the anchorage structure and the filler. When the temperatures of anchorage structure, bridge, track structure and subgrade increase at the same time, the longitudinal displacement of the anchorage structure and interface void between anchorage structure and filler are larger than those when the temperature of anchorage structure increases only, with an increase of 64.3% and 196.7% respectively. The maximum displacement of the anchorage structure under the action of temperature cyclic loading will gradually reach a certain stable state with the increase of cycle number. The deterioration of subgrade filler performance will increase the longitudinally displacement of the anchorage structure and the vertical void of the interface between the anchorage structure and the filler. When the mechanical parameters of subgrade filler are reduced to 0.7 times, the displacement of the anchorage structure and the interface void between anchorage structure and filler increase by 19.3 % and 31.9 % respectively. © 2021, Editorial Department of China Railway Science. All right reserved.