Ballasted track is a basic track structure used on the railway lines in china.It is a complex construction, including rail, under-rail pad, sleeper, roadbed and so on.

• 轨道是由钢轨、轨枕、联结零件、道床等部件组成的复杂结构物，其材料具有不同的力学性质，受力也有很强的随机性和复杂性，这给轨道的设计及力学仿真计算带来了诸多困难。