Study on Arching Pattern of Continuous Ballastless Slab Track Induced by Oblique Crack in Concrete Base under High Temperature in Summer
Oblique crack damage in the concrete base of ballastless slab track may result in arch deformation and sec-ondary damages under the influence of high temperatures in summer.In order to analyze the arch deformation,delamina-tion,stress,and damage caused by oblique cracks in the concrete base under high temperatures in summer,a finite ele-ment model of the CRTS Ⅱ slab ballastless track structure was established based on the cohesive zone model and the con-crete plastic damage model.The effectiveness of the model was verified by comparing it with on-site measurement results.The findings demonstrate that in the case of oblique crack penetration,the track structure begins to deform rapidly under the temperature force.The concrete base dips offset as the temperature rises.The track construction deforms into an arch as a result of the gap that first forms between the CA mortar layer and the concrete base,then between the track slab and the CA mortar layer.The gradual development stage from 0 to 20 ℃,the accelerated development stage from 20 to 30 ℃,and the quick destruction stage over 30 ℃ are the three stages of the evolution of structural properties with tem-perature.The maximum deformation of the track construction is 26 mm when the oblique fracture is positioned in the cen-ter of the precast track slab at an angle of 30°.It is recommended to focus on the oblique cracks that are located in the center of the precast track slab with an angle not exceeding 45°,when the temperature exceeds 30 ℃.
ballastless slab trackcohesive zone modelconcrete plastic damage modelhigh temperaturearch deformation
万方数据
维普
