The Effect Of Circular Curve Geometric Parameters On Heavy Haul Train’s Curve Negotiation Performance And Parameter Analysis

Line parameters of heavy haul railway have a significant impact on the safety of vehicles and the wear of wheel and rail. The technological innovation of existing heavy haul railways has resulted in a continuous improvement of both vehicle’s axle load and density. To reduce wear and ensure safety, there is an increasing requirement for railway curve setting. Thus, it is of great significance to investigate the effect of circular curve geometric parameters on heavy haul train’s curve negotiation performance and to optimize curve parameters.Combined with the actual operating situation of our heavy haul railway, a vehicle-track dynamic model was established in this thesis. The law of curve geometric parameters’effect on vehicle-track system dynamic response which including the super-elevation, the curve radius and the rail base slope was subsequently analyzed based on the model. Then, the curve parameters and matching are studied from the aspects of the operation safety and wheel-rail wear. The results indicate that the appropriate super-elevation can reduce rail side wear e.g. super-elevation of60mm can help to improve the wheel-rail contact state and curving performance while the balanced super-elevation is80mm. When the curve radius more than2000m, namely the lateral displacement is less than4mm, the wheel diameter difference and the contact angle difference are comparatively great under a rail base slope of1/20, result in a small wear and good wheel alignment capability. When the curve radius less than2000m, namely the lateral position is in the range of4mm to9mm, at this time, all performance indicators are better under a rail base slope of1/40. The research in this thesis is expected to provide helpful reference for the curve parameter setting of heavy haul railways.