朔黄重载铁路半径400 m曲线线路钢轨打磨周期

Grinding Cycle of Rails for Curved Lines with Radius of 400 m on Shuozhou-Huanghua Heavy Haul Railway

对朔黄重载铁路半径400 m曲线线路钢轨进行2次修理性打磨,通过实测打磨前后钢轨廓形,调研钢轨表面疲劳损伤发展情况,分析了钢轨廓形变化对轮轨接触几何关系的影响;通过建立实际参数车辆-轨道多体动力学仿真模型,研究了钢轨廓形对车辆动力学性能的影响。结果表明:打磨后轮轨关系得到优化,轮轨接触点集中问题得到明显缓解,曲线上股钢轨侧磨速率明显减小,曲线下股钢轨表面疲劳损伤得到有效抑制;打磨后累计通过总质量累计约60 Mt时轮轨横向力、磨耗指数、轮轨接触应力接近打磨前。为缓解钢轨病害发展,延长钢轨使用寿命,建议朔黄重载铁路半径400 m曲线线路打磨周期设置为60 Mt。

Two repair grinding tests were conducted on the rails of the 400 m radius curve line of the Shuozhou-Huanghua heavy haul railway.The rail profile before and after grinding was measured,and the development of fatigue damage on the rail surface was investigated.The influence of changes in rail profile on the geometric relationship between wheel-rail contact was analyzed.By establishing a real parameter vehicle-track multi body dynamics simulation model,the influence of rail profile on vehicle dynamics performance was studied.The results show that the wheel rail relationship is optimized after polishing,and the problem of concentrated wheel-rail contact points is significantly alleviated.The lateral wear rate of the rail on the curve is significantly reduced,and the surface fatigue damage of the rail on the curve is effectively suppressed.After polishing,when the cumulative total mass is about 60 Mt,the wheelrail lateral force,wear index,and wheel-rail contact stress are close to that before polishing.To alleviate the development of rail diseases and extend the service life of the rails,it is recommended to set the grinding cycle of the 400 m radius curve line of the Shuozhou-Huanghua heavy haul railway to 60 Mt.