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为确定弹性支承块式无碴轨道的合理刚度,提出以轨道应力与变形、动态轨距扩大及轨道动力响应参数为指标确定轨道刚度的方法。该方法运用有限单元法,建立弹性支承块式无碴轨道应力与变形、动态轨距扩大及动力响应3种计算模型,分析刚度对轨道应力与变形、动态轨距扩大及动力性能的影响。结果表明:增大钢轨支点刚度能减小钢轨弯曲应力和挠度,增大块下胶垫刚度能减小支承块位移;扣件刚度是影响动态轨距扩大的主要因素;增大扣件刚度能使支承块的加速度迅速增大。最后提出200 km/h弹性支承块式无碴轨道的合理刚度。
In order to determine the reasonable stiffness of the resiliently supported block ballastless track, a method to determine the orbit stiffness based on the orbital stress and deformation, dynamic gauge expansion and orbit dynamic response parameters is proposed. This method uses finite element method to establish three kinds of calculation models of the stress and deformation of the elastic support block ballastless track, dynamic gauge expansion and dynamic response, and analyzes the influence of stiffness on the track stress and deformation, dynamic gauge expansion and dynamic performance. The results show that increasing the stiffness of the rail fulcrum can reduce the bending stress and deflection of the rail, and increasing the stiffness of the rubber under the block can reduce the displacement of the bearing block. The stiffness of the fastener is the main factor that affects the dynamic gauge expansion. So that the acceleration of the support block increases rapidly. Finally, the reasonable stiffness of 200 km / h elastic support block ballastless track is proposed.