Influence Factors and Control Technology of High Temperature Arching in End Beam Area of Twin-block Slab Ballastless Track
Aimming at the problem of the upward arching of the track slab near the end beam area on the two ends of the subgrade section of the line twin-block slab ballastless track of the high-speed railway,the finite element method was used to study the influence law of different temperature combinations,subgrade section lengths,and end beam pile-soil constraint stiffness.The results show that the temperature deformation of the track slab is the main cause of the upward arching,but the deformation disturbance of the support layer and its combined effect with the temperature deformation of the track slab cannot be ignored.As the length of the subgrade section increases,the amplitude of the upward arching increases significantly.The influence of pile-soil constraints on the upward arching of the end beam is relatively complex.The upward arching reaches its peak at a specific constraint stiffness in the middle space,meanwhile the constraint stiffness increases or decreases,the upward arching shows a decreasing trend.The effect of disconnecting the support layer on controlling the deformation of high-temperature upward arching is not significant.Breaking the track slab has a significant effect,but it is necessary to consider the rail forces in the corresponding sections.
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