混凝土灌注过程中无砟轨道板产生位移的原因

为减少轨道铺设中的精调工作量,提高轨道板的施工精度,根据无砟轨道板下自密实混凝土灌注施工特点,基于流体力学理论建立了轨道板受力计算模型,用Fluent软件模拟计算了灌注过程中轨道板的受力情况.研究结果表明,灌注过程中,自密实混凝土流动作用是引起轨道板位移的主要原因;轨道板受力与自密实混凝土灌注速度呈指数关系增大,当灌注速度大于5 m/s时,需对轨道板施加竖向固定约束. 

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.