The Reasonable Stiffness of Ballastless Track Turnout of 250 km/h Passenger Dedicated Line

Research purposes:In China,the construction of passenger dedicated line is in progress on a large scale and in which the the majority are the 250 km/h ones.As the important infrastructure of passenger dedicated line,the stiffness of ballastless track turnout influences the safety and stability of the track,so it needs reasonable designed.According to the operating conditions of track,the research was done on the stiffness value of ballastless track turnout of passenger dedicated line with theoretical analysis for providing the theoretical guidance for determining the reasonable stiffness of ballastless track turnout of 250 km/h passenger dedicated line.Research conclusions:From five aspects of comfortableness,stress,vibration,deformation,and matching components stiffness,the criterions for determining the reasonable stiffness of the turnout were proposed.The method for determining the track stiffness was also established by using the vehicle-turnout space coupling dynamic analysis and track deformation analysis.With this,the research was done on reasonable stiffness of ballastless track turnout of 250 km/h passenger dedicated line.The research results showed that stiffness of 36～44 kN/mm to the fastening,the stiffness of 290～330 kN/mm to the rubber pads under rail,and the stiffness of 40～50 kN/mm to the rubber pads under tie plate were reasonable.