Research On The Influence Of Curve Parameter On Rail Wear For Heavy Haul Railway

With the rapid development of the global economy, the national interregional trade activities increasing, heavy haul has naturally becamed one of the main development directions in today’s railway field. However, the increase of axle load, marshalling and running speed make the rail wear of curve track more serious, and bring the corresponding traffic safety problems. In order to solve corresponding problems, choosing the best combination of parameters, which could reduce rail wear from the pre-design and post maintenance of the heavy haul railway curve parameters, is a more economical, straightforward way.A heavy haul train model based on UM simulation software is established, while derailment coefficient, wheel load reduction rate is used as the safety assessment, wheel-rail lateral force, lateral creep forces, hedge round corner, wear power as the wear assessment index. A variety of the single factor and multiple factors are simulated on curve alignment parameters, and the method of comparative analysis is used to study on the settings of curve alignment parameters from the lower curve of the rail wear point of view. The major works are as follows:(1)Combined with the relevant specifications of railway and the actual conditions of railway, the detailed analysis of the heavy haul railway curve alignment parameters(curve radius, circular curve length, transition curve, slope length, limiting slope, slope difference and vertical curve radius), curve speed and track geometry parameters(superelevation, rail cant) are set, and the corresponding range of values are determined. The basis for simulation analysis curve parameters is provided.(2)The influence laws of rail wear are studied in curve parameters of single factor changes, and several parameters setting methods of slowing down curve rail wear are put forward.(3)The common law of different transition curve length on curve rail wear is studied, and the transition curve length, which gradually has little effect on curve rail wear, is selected as the best set of transition curve length. Several speeds under different radius corresponding to the best transition curve length on reducing rail wear are presented.(4)Corresponding setting principles and specific setting methods are put forward in response to optimizing the combination factors of superelevation and rail cant of heavy haul railway to slow down curve rail wear.(5)Track irregularity is set in the simulation analysis, the universality of combination factors of superelevation and rail cant setting principle is further verified, and found that the track irregularity has a great influence on uneven curve rail wear.