无砟轨道路基地段曲线超高设置方式的研究

利用有限元方法,分别建立空间耦合精细化静力模型及车辆-轨道-路基动力协同仿真模型,对路基曲线地段无砟轨道采用不同超高设置方式后的力学特性进行对比研究,为无砟轨道超高设置方式的合理应用提供依据。分析结果表明:(1)采用支承层设置超高可减小结构变形及支承层本身受力,但轨道板纵、横向应力会明显增大;(2)采用支承层设置超高时,超高量变化对无砟轨道受力变形影响较明显,结构纵、横向应力随超高量的增加而增大;(3)支承层设置超高具有较好的减振效果,无砟轨道结构动态变形较小。

The Setting of Curve Superelevation for Ballastless Track in Subgrade Section

A static spatial coupled model and a dynamic vehicle-track-subgrade coupled system model for ballastless track in curves are developed with finite element method to analyze mechanical characteristics of ballastless track with different curve superelevation settings in subgrade section,providing references for the proper application of curve superelevation setting. The results show that: 1) Where curve superelevation is set up with the supporting layer,the supporting layer stress and structural deformation are relatively smaller, but the longitudinal and lateral stresses increase sharply. 2) Where curve superelevation is set up with the supporting layer,the impact of the changes of curve superelevation on the stress and deformation of ballastless track is remarkable,and the structure longitudinal and lateral stresses increase with the increase of curve superelevation. 3) The setting of curve superelevation with the supporting layer has good vibration-reducing effect,and the dynamic deformation of ballastless track is smaller.