The dynamic finite element model of the infrastructure above embankment was established for CRTS Ⅱ slab ballastless track via ANSYS to analyze the dynamic stress distribution and transfer law of track and subgrade under the moving load with different speeds. Results indicate that, in different layers of track and subgrade, the dynamic stress distribution along the lateral direction has little to do with the speed of the moving load but has much to do with the distance away from the bottom of the rail. The stress distribution of track slab along the lateral direction presents to be a hump, and the stress reaches its maximum value right beneath the rail. The stress level between the rails is basically identical. With the increase of the depth, the dynamic stress of subgrade attenuates sharply when the depth is less than 1 m away from rail bottom, attenuates almost linearly within 1~4 m and attenuates slowly beyond 4 m. It is also found that the dynamic stress of infrastructure at different position increases on the whole with the increase of moving load speed. The stress increases linearly with the increase of speed in the range of train speed from 80 to 350 km · h-1. Whereas when the speed is less than 80 km · h-1 or greater than 350 km · h-1, the stress does not change obviously.%运用ANSYS软件,建立路堤上的CRTSⅡ型板式无砟轨道基础结构的动力有限元模型,研究不同速度移动荷载作用下轨道和路基动应力的分布和传递规律.结果表明:在不同的轨道和路基层内动应力沿横向的分布规律与移动载荷的速度相关性不大,而与各层距钢轨底面的距离关系很大；轨道板应力沿横向呈驼峰形分布,最大值位于钢轨正下方,钢轨之间应力水平基本一致；路基动应力随深度的增加,在距离钢轨底面1m范围内急速衰减,在1～4 m范围内基本呈线性快速衰减,超过4m后衰减较为缓慢；不同位置的路基动应力总体上随着移动荷载速度的增加而增大,在80～350 km·h-1的车速范围内具有较为明显的线性关系,而当速度小于80 km· h-1或者大于350krn·h-1时变化不明显.
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