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建立轨道过渡段基础刚度突变的轨道振动微分方程,推导单轮作用下轨道变形的解析表达式。利用该解析解和叠加原理,研究轨道刚度突变对轨道振动的影响,分析单轮对和TGV高速列车在3种轨道刚度比时的轨道动力响应。结果表明,轨道刚度突变对轨道振动影响较大,轨道动力响应随着刚度比和列车速度的增加而增加。在理论分析基础上,提出轨道过渡段整治原则:过渡段宜采用分层(3~4层)强化基础刚度的措施;列车在过渡段运行时应满足所引起的动力系数小于或等于1.2及过渡段各层之间的刚度比在0.5~1之间;过渡段每层平缓距离,当列车速度小于或等于160 km.h-1时,取5 m,当列车速度大于160 km.h-1时,取10 m。
The differential equation of orbital vibration with sudden change of foundation stiffness is established, and the analytical expression of the orbital deformation under single wheel rotation is derived. Using the analytical solution and superposition principle, the influence of orbital stiffness change on the orbital vibration is studied. The orbital dynamic response of the single-wheel and high-speed TGVs at three kinds of orbital stiffness ratios is analyzed. The results show that the sudden change of orbit stiffness has a great influence on the orbital vibration, and the orbital dynamic response increases with the increase of the stiffness ratio and the train speed. On the basis of theoretical analysis, the principle of track transitional section remediation is put forward: the transitional section should adopt the measures of stratification (3 ~ 4 layers) to reinforce the foundation stiffness; the train should satisfy the induced dynamic coefficient less than or equal to 1.2 and the transition The stiffness ratio between the layers is between 0.5 and 1. The smooth distance of each layer in the transition section is 5 m when the train speed is less than or equal to 160 km.h-1. When the train speed is more than 160 km.h -1 When, take 10 m.