| With the development of China’s economy,the number of high-speed railway construction projects in the central and western regions is gradually increasing.The central and western regions are mainly mountainous terrain,and the terrain fluctuates violent.In order to overcome the elevation,avoid through bad geology and save engineering investment as soon as possible,more long and steep ramps are used in the longitudinal section design.However,the setting of long and steep ramps will cause many adverse effects on train operation.Therefore,it is necessary to study the train operation of EMU on long and steep ramps.In this paper,through the establishment of EMU operation simulation system,the influence of long ramp setting on EMU operation is studied and analyzed from the aspects of driving safety of long and steep downhill,adaptability of long and steep uphill EMU operation to slope length,train passing through electric phase separation and transportation capacity,as well as the long and steep ramps schemes in Chongqing-Kunming high-speed railway are studied.Based on the research results of various aspects,the main work and research conclusions of this paper are as follows:(1)For EMUs operating at 350 km/h,considering the requirements that the final speed of the slope top is not less than 70% of the design speed and the driving safety under braking failure,the slope gradient and slope length in the longitudinal section design can be referred to the following settings : The slope length is not limited at 15‰or below,the slope length at 20‰ is not more than 43.6 km,the slope length at 25‰ is not more than 19.5km,the slope length at 30‰ is not more than 10 km,and the slope length at 35‰ is not more than 6km.(2)When the EMU is operated by automatic passing through the electric phase separation on the long and steep ramp,the train should ensure that the entrance speed of the electric phase separation is greater than or equal to 110km/h on the line with a slope of more than 20‰,the entrance speed of the train should be greater than or equal to80km/h on the slope of 10‰ and above,and the entrance speed should be maintained at more than 60km/h below the slope of 10‰.In particular,it should be noted that in the electric phase separation area with slope greater than 15‰,the train inlet speed of60km/h may not meet the safety requirements.For the difficult situation,it is recommended to set a low slope before the electrical phase separation entrance to accelerate the train or set the electrical phase separation area at a low slope.(3)Consideringly considering that the emergency braking distance of EMUs on long and steep downhills meets the requirements of 《 Measures for Technical Management of Beijing-Tianjin Intercity Railway》and the interval of train interval tracking is less than or equal to 5min,the speed limit setting trains on long and steep downhills is carried out.It is considered that the EMU speed of 350km/h on long and steep downhills with growth of more than 6500 m on the slopes of-15‰,-20‰,-25‰,-30‰ and-35‰ should be maintained below 342km/h,334km/h,326km/h,314km/h and 278km/h respectively to meet the requirements of the specification.(4)Three kinds of long and steep ramp schemes of Chongqing-Kunming high-speed railway are simulated.Through the comprehensive analysis of the average running speed,running time and energy consumption of the train section,it is considered that the comprehensive slope scheme based on 30‰ is the best,and it is recommended to select this slope scheme,which is the same as the actual selection scheme.(5)Based on the MATLAB,the EMU model is established,and the energy-saving and time-saving strategies of train operation are constructed.Considering the influence factors of long and large ramps on train operation,the simulation software for the design of long and large ramps of high-speed railway is developed,so as to provide help for the design and comparison of line profile,the simulation of EMU operation,and the research on the influence factors of long and large ramps. |
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