基于离散元分析的高速铁路桥上轨枕选型

为合理选择高速铁路桥上有砟轨道轨枕形式,在轨枕形式的综合调研基础上,采用PFC 3D离散元软件,建立了Ⅲ型轨枕、宽轨枕、梯子式轨枕和框架型轨枕的轨枕-道床模型,对高速铁路桥上有砟轨道结构进行了数值分析.结果表明:4种轨枕都具有较大的轨道框架刚度,具备持久保持轨道几何形位和稳定性的能力;宽轨枕和框架型轨枕与道床的接触力分布较均匀,最大接触力也较小,比Ⅲ型轨枕更适用于高速铁路桥上有砟轨道结构.但考虑到框架型轨枕的优势不明显以及尚未开发相应的养护维修设备,建议高速铁路桥上有砟轨道采用宽轨枕. 

3D Discrete Element Analysis of Selection of Sleeper Types on High-Speed Railway Bridge

In order to select a reasonable sleeper type used for a high-speed railway bridge, based on a comprehensive investigation of sleeper types, sleeper-ballast bed models for type Ⅲ sleeper, broad sleeper, ladder sleeper and frame sleeper were established using the discrete element software PFC 3D, and numerical analyses of ballast track structures for high-speed railway bridges were carried out. The research result shows that the four sleeper types have a large track frame rigidity and a long-time ability to sustain track geometry and stability. Contact forces between broad sleeper as well as frame sleeper and ballast bed are relatively small and distribute more evenly, and compared with type Ⅲ sleeper, broad sleeper and frame sleepe are more suitable for ballast track structures on high-speed railway bridges. However, the advantages of frame sleeper are not so obvious and its corresponding maintenance equipment has not been developed, so broad sleeper should be adopted for high-speed railway bridges in China.