Research on Temperature and Humidity Cracks in Early Age of Track Slab of Double-Block Ballastless Track Structure

Based on the finite element method (FEM), this paper considers the constitutive relationship of the early age of concrete materials to study the distribution of surface cracks in the track slab under the action of uneven temperature and humidity fields. The research results show that: (1) The temperature stress on the surface of the early-age track slab is relatively large, especially in the middle area of the slab; (2) The track slab during sprinkler curing period has the risk of cracking, and the uneven temperature field has a significant impact on the cracks around the sleeper; (3) The humidity stress of track slab is mainly concentrated on the areas connected to the sleepers; (4) During the natural curing period, the humidity stress value on the surface of the track slab is greater than the tensile strength of the concrete. Furthermore, the uneven humidity field can easily cause transverse cracks in the center area of the track slab surface.