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研究目的:我国正在进行大规模的客运专线建设,其中时速250km的客运专线占有相当大的比重。无砟道岔作为客运专线的重大基础设备,其轨道刚度影响动车组过岔时的安全性和平稳性,需进行合理设置。根据线路运营条件,运用理论分析,开展客运专线无砟道岔轨道刚度取值研究,为确定我国250km/h客运专线无砟道岔的合理轨道刚度提供理论指导。研究结论:从列车运行品质、道岔应力状态、振动水平、变形大小和部件刚度匹配5个方面提出岔区合理轨道刚度的评判准则,并基于车辆—道岔空间耦合动力学理论和轨道变形分析建立岔区合理轨道刚度的确定方法,对我国时速250km客运专线无砟道岔轨道的合理刚度进行了研究,结果表明:36～44kN/mm的扣件系统刚度,290～330kN/mm的轨下胶垫刚度,40～50kN/mm的板下胶垫刚度最为合理。
Research purposes: China is carrying out large-scale passenger dedicated line construction, of which 250 km / h passenger dedicated line occupies a large proportion. Ballastless turnout as a passenger dedicated line of major infrastructure equipment, the orbit stiffness of the impact EMU turnout safety and stability, the need for a reasonable set. According to the condition of line operation, the theoretical analysis is used to study the stiffness of ballastless track on passenger dedicated line, which provides theoretical guidance for determining the reasonable orbit stiffness of ballastless switch on passenger dedicated line of 250 km / h. Research conclusions: The criteria for judging the reasonable orbit stiffness of the turnout area are proposed based on five aspects of the train running quality, the stress state of the turnout, the vibration level, the deformation size and the stiffness of the components. Based on the coupled dynamics theory of the vehicle-turnout and the orbital deformation analysis, The reasonable stiffness of the orbit track in China is studied. The results show that the stiffness of the fastener system of 36 ~ 44kN / mm, the stiffness of the track under 290 ~ 330kN / mm , 40 ~ 50kN / mm plate under the most reasonable cushion stiffness.