Study On The Influence Of Train Diagram Structure On Passing Capacity Of High Speed Railway

Firstly,this paper introduces the basic concepts of train diagram,and analyses the elements of horizontal and vertical structure of train diagram according to the two-dimensional direction of train diagram.Taking Beijing-Shanghai high-speed railway as an example,according to the diagram at the end of 2017,the structure characteristics of the diagram in Beijing-Shanghai high-speed railway are analyzed,including the type and quantity of trains,transport organization mode,stop structure and overtaking arrangement,etc.Taking Shinkansen Line in Japan as an example,the structure of the diagram and operation characteristics of Shinkansen Line in Japan are analyzed.Then,by comparing and analyzing the characteristics of two typical high-speed railways,Beijing-Shanghai high-speed railway and Shinkansen high-speed railway in Japan,it is found that the structure of the high-speed railway diagram in China is more complex and the regularity is not obvious than that of Shinkansen high-speed railway in Japan.After analyzing the relationship between the occupancy time and the capacity of the operation chart,the capacity utilization of the diagram is expressed by the occupancy time of the diagram.By analyzing the composition of the structure unit of the diagram,it is found that the running train group cannot be determined when the train overtaking.Therefore,the structure unit of the diagram is standardized,and the running line group is proposed as the structure unit of the running diagram when the train overtaking.Then,on the basis of determining the ideal conditions of the diagram,the influence of different structure units of the diagram on the capability under ideal conditions and general conditions is analyzed.On the basis of determining the elements in the vertical structure of the diagram,including the number of stops and the structure of stops.The relationship between the two elements and the capacity is analyzed qualitatively.Next,the formula of calculating the extra time occupied by the structure of the diagram under ideal conditions is deduced.Through quantitative analysis of the relationship between the stopping rate and the capacity of the diagram,it is concluded that the relationship between the stopping rate and the capacity presents an U-shape.Then,on the basis of determining the characteristic parameters of the stop structure,the relationship between the characteristic parameters and the capacity is quantitatively analyzed,and the linear relationship between the characteristic parameters of the stop structure and the extra time occupied by the operation diagram is obtained.After deriving the formula,the capacity of the diagram under ideal conditions is determined by the stopping condition of the first train,the stopping condition of the last train,the stopping rate of the station and the number of characteristic parameters.Finally,the above laws are verified by drawing train diagram.On the basis of determining the elements of the lateral structure of the diagram,the relationship between the elements of the lateral structure and the capability is qualitatively analyzed.Then,on the basis of the previous paper,the formula for calculating the extra occupancy time of diagram under general conditions is derived.Through the calculation and analysis of the influence of B type trains on the capacity by MATLAB,it is concluded that with the increase of the proportion of B type trains,the capacity increases first and then decreases,and when the ratio of B type trains is around 55%,the influence of B type trains on the capacity is the greatest.Then,on the basis of determining the characteristic parameters of the running line drawing structure,the relationship between the characteristic parameters and the capability is quantitatively analyzed.It is concluded that the relationship between the characteristic parameters and the additional occupancy time of the running chart is approximately linear.The smaller the value of the characteristic parameters,the smaller the influence of the occupancy time of the running chart,the greater the capacity of the diagram.Finally,the above laws are verified by drawing train diagram.This paper focuses on the current high-speed railway capacity shortage problem,through excavating the potential law between the structure and capacity of the operation diagram,it has a certain guiding significance for the transport organization of busy high-speed railway.