Abstract

The slab-mat composite assembled ballastless track, a novel form of urban rail transit structure, features a typical sandwich construction. Rubber material plays a crucial role in adjusting deformations of track system. This research establishes a three-dimensional refined finite element model to analyze the interaction among track slab, rubber mat (sleeve), and limit pile, considering interface failure. A full-scale longitudinal push slab test is conducted to validate the model. The study investigates the influence of rubber sleeve thickness and limit pile diameter on the mechanical properties of the track structure, interlayer bonding under temperature gradients, and the causes of track bending deformation. Results show that increasing the limit pile diameter reduces track slab displacement and contact stress, while increasing rubber sleeve thickness leads to higher slab displacement. Larger limit pile diameters improve the mechanical behavior of the track system. Rubber material effectively coordinates interlayer deformations, reducing damage to the rubber mat and concrete interface. The rubber mat absorbs most deformation due to temperature gradients, minimizing slab deformation and enhancing overall performance.

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