In order to study the damping performance of double-block ballastless damping track in high-speed railway, a calculation model of double-block ballastless damping track was established. The finite element power flow method was adopted to calculate the power flow of the track structure. The track structure power flow transfer characteristic in vertical direction and the influence of parameters of fasteners and the damping layer were analyzed. The results show that the peak value of the power flow is reached at the natural frequency of the track structure, which indicates that the frequency of power flow peak relates to the vibration mode of the track structure. In the frequency range of 200-1200 Hz, the power flow of the roadbed slab passes from rail is reduced to maximum by fastener to achieve the optimal vibration reduction effect. In the low frequency range of 1-10 Hz, the damping effect of damping layer is weak. And in the frequency range of 1-200 Hz, the low stiffness of the damping layer makes better damping effect. While in the frequency range of 200- 1200 Hz, the damping effect of damping layer is significant and the maximum power flow reduction of the supporting layer is at 1200 Hz by 14％. However, after setting the damping layer, the power flow of slab increases in the frequency range of 3-2000 Hz, with the largest increase in the range of 60-100 Hz. With the increase of the damping layer stiffness, the frequency increases when the damping layer begins to reduce the vibration of the track structure.%为研究高速铁路减振双块式无砟轨道的减振性能,建立减振双块式无砟轨道计算模型,采用有限元功率流法计算轨道结构的功率流,并分析功率流在轨道结构中的竖向传递特性以及扣件和减振垫参数对结构功率流的影响.研究结果表明:轨道结构功率流峰值与轨道结构的模态振型有关,在轨道结构固有频率处达到峰值;当频率为200～1200 Hz时,扣件最大程度地减少钢轨传递给道床板的功率流,从而达到最佳的减振效果;当频率为1～10 Hz时,减振垫的减振作用相对较弱;当频率为1～200 Hz时,降低减振垫刚度有利于减小振动;当频率为200～1200 Hz时,减振垫对支承层的减振作用显著,在1200 Hz处功率流最大减幅为14％;当频率为3～2000 Hz时,设置减振垫后道床板的功率流反而有所增加,当频率为60～100 Hz时,增幅最大;随着减振垫刚度增加,减振垫开始起减振作用的频率增加.
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