Comparative Analysis on SCC Pouring of Ballastless Track in Straight and Curved Sections
In view of the problems of floating of track slab and excessive stress on fastening device during self-compacting concrete(SCC)pouring,based on the Coupled Eulerian-Lagrangian(CEL)method,this paper establishes fluid-solid coupling models for SCC pouring of CRTS Ⅲ slab ballastless track in straight and curved sections respectively,and compares and analyzes the mechanical characteristics of track slab and fastening device during SCC pouring in straight and curved sections theoretically.The study results indicate that the floating force of track slab,the maximum vertical and lateral displacements of track slab and the axial force of toggle arm increase with the increase of hopper height or the number of hoppers.The floating force of track slab,the maximum vertical displacement of track slab and the axial force of toggle arm in curved section change more significantly with the increase of hopper height.During single-hole grouting,the floating force of track slab,the maximum vertical displacement of track slab and the axial force of toggle arm in curved section are less than those in straight section;during double-hole grouting,they are greater than those in straight section.The maximum lateral displacement of track slab in curved section is significantly greater than that in straight section.This is mainly because the horizontal component of the floating force of track slab in curved section exerts a pushing effect on the track slab in the lateral direction.The axial force of inner toggle arm in curved section is significantly greater than that of outer toggle arm.
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