Research On Optimization Of Passing Capacity Of High-Speed Railway Under Condition Of Node Service Frequency Is Basically Constant

The purpose of this thesis is to improve the passing capacity of high-speed railway and the core requirement is to keep the frequency of node service basically constant.This paper expounds the research background and significance of the passing capacity of high-speed railway,the general situation of the passing capacity of highspeed railway,the influencing factors of the passing capacity of high-speed railway,and the calculation method of the passing capacity of existing high-speed railway.On this basis,an average minimum train interval improvement method is put forward and its characteristics are discussed.Using the average minimum train interval improvement method,the paper takes the operating parameters of high-speed railway in China as the realistic basis and combines them with the field practice.Taking the train at the speed of 310km/h as the standard train,the capacity utilization relationship between trains at the speed of 310km/h,310km/h and 350km/h,310km/h and 250km/h,350km/h and 250km/h is analyzed.The stopping mode of the train is analyzed.The structure of train operation diagram is analyzed quantitatively,and the law of optimization of passing capacity of high-speed railway in a single scene is obtained.That is to say,trains with similar or identical running lines should be laid out in a centralized way.Under the condition that the service frequency of nodes is basically constant,the impact of overrunning,mixed running and stopping can be reduced to the minimum,so that the train operation diagram can be as close as possible to the distant and stopping structure.According to the basic requirement of constant service frequency of nodes,the previous research results and relevant constraints,the design process of model frame building,operational drawing and evaluation passing capacity optimization was described by using the idea of genetic algorithm.This paper describes the key technologies such as the idea of designing train operation diagram,up and down line of the cross-line trains,the interoperability of and the station nodes.Finally,taking the Beijing-Shanghai high-speed railway as an example,the service frequency of existing station nodes as the basic requirement are optimized and simulated.Firstly,the four sections of Beijing-Jinan,Jinan-Xuzhou,Xuzhou-Nanjing and Nanjing-Shanghai are simulated respectively,determine the train stop plan and draw the train operation diagram and then the whole line is integrated to deal with the problems of the line and the cross-line as a whole.The simulation results are compared with the existing train operation diagram.After optimization,the simulation satisfies the basic constant service.The number of trains in the whole route of Beijing-Shanghai high-speed railway increased from 42 trains per day to 61 trains per day after optimization.Nanjingnan railway station has the largest stopping number of trains at all stations on the Beijing-Shanghai high-speed railway,with 217 trains per day.The capacity of the Beijing-Shanghai high-speed railway has been optimized and improved,among which the most significant section is Nanjing-Shanghai section,with a maximum increase of 75.26% in traffic volume and a maximum reduction of 42.89% in average interval time.