Reasons for Displacement of Ballastless Track Slab during Self-Compacting Concrete Pouring

In order to reduce the workload of fine adjustment track laying and improve the precision of track slab, a calculation model was established based on the characteristic of pouring self-compacting concrete under track slab and the fluid mechanics, and forces on track slab in self-compacting concrete pouring were calculated numerically with software Flulent. The research result shows that dynamic pressure due to pouring self-compacting concrete is a key factor for the displacement of track slab in the process; there is an exponential function relation between pressure on track slab and pouring velocity of self-compacting concrete; when the pouring velocity is greater than 5 m/s, track slab needs to be restrained in its vertical direction.