中文摘要：

路桥过渡段是高速铁路线路的薄弱环节之一，路桥过渡段的轨道结构动力性能也直接影响到列车运行的平稳性。根据高速铁路对路桥过渡段轨道结构动力性能的要求，进行了改变轨下垫层刚度、使用2.8m长轨枕、使用轨枕胶垫和道砟垫、铺设辅助轨等7种轨道结构的动力性能试验。试验结果表明，轨下胶垫对改变轨道结构的动力性能作用有限，枕下胶垫和道砟垫能根据需要较为方便地调整轨道结构的整体刚度，2.8m长轨枕和辅助轨对提高轨道结构的整体性具有较大的作用。在动力荷载作用下，桥上道砟的密实度提高较快，从而进一步加大了与路基轨道的刚度差。对于高速铁路，在选择轨道结构时，不仅要考虑轨道刚度的合理值及其匹配，同时还应考虑轨道部件质量的合理分布。

英文摘要：

The transition section between bridge and plain track is one of the weak points of high-speed railway. The dynamic performance of the track structure at the transition section between bridge and plain track will directly affect the running stability of high-speed trains. According to the requirement of the high-speed railway for the dynamic performance of the track structure at the transition section between bridge and plain track, the dynamic performance tests of 7 track structure types were conducted, i.e. changing the rail pad stiffness, using 2.8 m sleepers, setting sleeper rubber pad, laying ballast mat and as- sistant rails, etc. Test results show that the effect of rail pad on changing the dynamic performance of track structure is little. The sleeper rubber pad and ballast mat can conveniently adjust the track stiffness according the requirement. 2.8m sleepers and assistant rails have greater effect on improving the integrity of the track structure. The ballast density on the bridge is improved faster under dynamic load, and the stiffness difference between bridge and plain track is further increased. For choosing the track structure of high-speed railway, not only the reasonable value of track stiffness and its matching must be considered, but also the reasonable distribution of track components＇ masses should be taken into account at the same time.