Numerical Simulation on the Pouring Process of Self-compacting Concretein CRTS III Slab Track

Abstract

In this study, a fluid-solid coupling model describing the pouring process of self-compacting concrete (SCC) in CRTS III ballastless slab track in straight section was established based on a coupled Eulerian-Lagrangian method, which realized the simulation of the whole pouring process of SCC. The influence law and mechanism of different construction parameters on the pouring process of SCC were studied theoretically. The effects of height and number of funnels on some key indices including the filling rate of SCC, the vertical and lateral displacements of slab track and the forces of withhold were mainly analyzed. The study was aimed at providing theoretical guidance for the intelligent pouring of SCC and the development of intelligent pouring equipment. Results indicated that the higher funnel and double-hole pouring both reduced the pouring time and improved the construction efficiency, and the latter one demonstrated a significant effect. The maximum vertical displacement of track slab was appeared in the middle of slab edge during single-hole pouring but was found in the vicinity of observation hole during double-hole pouring. The maximum lateral displacement of track slab was appeared near the withhold during the pouring process. A higher funnel led to greater pressure of SCC to track slab, which brought about larger vertical and lateral displacements of slab track and higher forces of withhold. Compared to single-hole pouring, the final floating dis-placement and lateral displacement of slab track and the force of withhold were greater during double-hole pouring

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