既有线提速平面曲线半径与曲线实设超高关系的分析

铁路线路平面曲线半径(R)选择与曲线实设超高(Δh)设置对提高列车行车速度具有重要的作用,针对既有线提速改造,分析了铁路最小曲线半径与列车运营模式的关系,曲线半径R与Δh的关系,建议新设的曲线半径应尽量选择较大值,Δh选择在20～40mm,为将来的超高调整留有余地。在客、货混运的线路上,最小曲线半径不仅与最高行车速度有关,而且还受最低行车速度的影响;同时,最小曲线半径也与欠超高和过超高的允许值有关。因此,提高最低行车速度、缩小最高与最低速差将获得较小的曲线半径,从而可节省工程投资。

Studying the Independence of Radius of Plane Curve to Actual Elevation of Curve for Speed-Raising on Existing Line

How to select radius of track plane curve and determine the actual elevation of curve is of great importance in running speed of train. As to the speed-raising reconstruction, by analyzing the independence of minimum radius of curve to service mode of train, and radius of plane curve to actual elevation of curve, we suggest to set the new radius of curve as bigger as possible, set Δh from 20~40mm leaving allowance for future adjustment in elevation. Of the mixed passenger and freight line, minimum radius of curve depends not only on maximum running speed, but also on maximum running speed, as well as on the tolerance of underelevation and overelevation. So raising the minimum running speed, narrowing the margin between maximum speed and minimum speed may helps to save the investment in project.