The Optimization Algorithm Of Precise Adjustment Of The Transition Section Between Ballast Track And Ballastless Track

At present,the research on the transition section between ballast and ballastless track mainly focuses on two aspects of track optimization design and dynamic performance.There have been few studies on how to adjust the transition section to keep the geometric regularity.The transition section is divided into ballast track part and ballastless track part.The main line of ballast track is mainly adjusted by tamping operation.The ballastless track is finely adjusted by the fastener system.However,the ballast track can only be completed by manual adjustment.The plane and longitudinal reference track are adjusted by pulling chord method and rail gauge method.Then the rail gauge is used to control gauge and level to complete adjustment of the non-reference track.Site workers according to the track adjustment plan,rely on their own experience to adjust.It could produce different operation methods,resulting in good or bad homework results.Therefore,it is necessary to solve the problem that how to optimize the original adjustment plan by using the pulling chord method and rail gauge method.Combining with manual adjustment method of ballast track on transition section.By comparing and analyzing adjustment amount before and after adjustment,modeling and analyzing the track lifting process,the optimization model of plane and longitudinal adjustment is established.The optimization software of transition section between ballast track and ballastless track is developed by using C# language.Comparing with the remaining adjustment,which are obtained by using the original scheme and experience coefficient scheme adjust.The experimental data analysis shows that when the transitional track is adjusted,if the track lining value of the adjustment area is all less than 4mm,making an adjustment every four sleepers from the starting point of the pulling chord.Before and after the adjust point do not affect each other,the original scheme use is adjusted directly and does not need to be optimized.When the track lining value is more than 4mm,comparing original scheme with adjustment optimization scheme,the following conclusions can be drawn.When the transition section is located in a line segment,the residual maximum of track lining value is reduced by 1.8mm,and the cumulative residual of track lining value decreases by 2.1 times,and the average residual of track lining value decreases by 2 times.When the transition section is located in a circular curve,the residual maximum of track lining value is reduced by 2.6mm,and the cumulative residual of track lining value is reduced by 3.3 times,and the average residual of track lining value is reduced by 3 times.When the longitudinal section of the transition section is adjusted,manual pulling chord will appear the problem of string sagging.However,the rail gauge method can avoid this effect.The correctness and practicability of the optimization model of longitudinal section adjustment is proved by using experience coefficient scheme on field operation.When the difference between the measured level and the design level is not zero,the maximum residual of track lifting value is reduced by 0.4mm,the cumulative residual of track lifting value is reduced by 1.1 times,and the average residual of track lifting value is reduced by 1 times.