长大坡道对我国250 km/h高速铁路运输能力影响研究

Influence of Long Steep Grade on the Carrying Capacity of 250 km/h High Speed Railway in China

近年来,我国中西部地区相继建成了多条设计速度250 km/h高速铁路,其中很多线路存在连续长大坡道的情况,不可避免会对运输能力存在一定影响。利用仿真计算方法,分别从上坡运行与下坡运行2方面分析长大坡道对高速铁路通过能力的影响,得出上坡运行时,在坡道运行存在速差,不同速度等级列车共线运营导致通过能力有所下降;下坡运行时,由于动车组制动距离变长,导致列车区间追踪间隔变大,从而影响通过能力,最后提出250 km/h长大坡道高速铁路动车组运用对策,对提高我国中西部250 km/h长大坡道高速铁路运输能力和运营质量具有一定指导意义。

In recent years,many high speed railways with a design speed of 250 km/h have been built in central and western China.Many of them have long steep grades,which will inevitably affect the carrying capacity.This paper used the simulation method to analyze the influence of a long steep grade on the carrying capacity of a high speed railway from two aspects of uphill and downhill operations.The results show that there is a speed difference on the grade when an electric multiple unit(EMU)is running uphill,and the carrying capacity of EMUs with different speeds will be reduced in the case of operation on the same line.When running downhill,EMUs have increased time headway due to their longer braking distance,which thereby affects the carrying capacity.Finally,the paper put forward the operation countermeasures for 250 km/h high speed railway on long steep grades,being of guiding significance for elevating the carrying capacity and operation quality of 250 km/h high speed railway on long steep grades in central and western China.