道床是轨道线路的重要组成部分．道床的良好状态是保证轨道结构强度、保持道床弹性和稳定性的重要条件，它不仅能确保运输安全和机车车辆的使用寿命，同时在线路养护维修工作量的大小上也起着决定性的作用．近几年来道床污染板结非常严重，探索减缓道床污染恢复线路弹性是目前 Track bed is an important part of the track line. The good condition of the track bed is an important condition for ensuring the strength of the track structure and maintaining the flexibility and stability of the track bed. It not only ensures the transport safety and the service life of the rolling stock, but also plays a decisive role in the amount of maintenance work on the line. In recent years, ballast bed knot pollution is very serious, to explore ways to reduce the flexibility of line bed pollution recovery line is currently