Research On Optimization Of Cross-line Train Operation On Busy Trunk Lines Based On Capacity Utilization

As China’s high-speed railways gradually become a network and service levels are gradually improving,high-speed rail services attract more and more passenger flows,especially in the economically developed central and eastern regions.Due to superior geographical conditions and developed economic conditions,the number of passenger flows is large,The composition is complex,the utilization of high-speed railway capacity is tight,and it is often difficult to find a ticket during peak periods,forming a busy main line of high-speed railway.In this context,the study of methods to improve the capacity of busy trunk lines has strong practical value.There are a large number of cross-line trains operating on busy arterial lines.Although the passenger direct rate is increased,the line capacity is also cut,affecting the operation of trains on this line,and reducing the capacity utilization efficiency of the line.Therefore,this article starts with the research on the improvement of capacity from the cross-line train.Based on the study of cross-line train operation and capacity utilization research at home and abroad,this paper analyzes the relationship between cross-line train operation and capacity utilization based on the actual operation data of the busy trunk line of Beijing-Shanghai high-speed railway on a certain day,and summarizes the effect of crossline train operation.The structure optimization model and the space-time optimization model based on capacity utilization are established,and the analysis is carried out in combination with examples.The specific research contents of this paper are as follows:(1)Analyzed the relationship between the operation of cross-line trains and capacity utilization,and selected the Beijing-Shanghai high-speed rail as the main representative of the busy trunk line.Based on the data of the Beijing-Shanghai high-speed rail on a certain day,the capacity utilization situation and the cross-line of the Beijing-Shanghai high-speed rail were analyzed.Train operation conditions,summarize the impact of crossline trains on capacity,summarize the problems in the utilization of the Beijing-Shanghai high-speed rail capacity;analyze the possible transmission modes of cross-line trains,and summarize the advantages and disadvantages and applicable conditions of different transmission modes;Analyze the impact of cross-line train operation on capacity from the theoretical level,and lay a theoretical foundation for follow-up research.(2)Establish a structural optimization model for cross-line trains and trains on the same line based on capacity utilization.In view of the large proportion of cross-line trains on the Beijing-Shanghai high-speed rail line,and some cross-line trains serve most of the passenger flow of the same line,the average proportion of cross-line trains cross-line passenger flow is set to determine whether the cross-line trains are running,which will affect the impact Passenger flows are redistributed and merged,and on this basis,a structural optimization model based on capacity utilization is compiled to determine the number of trains on the line after the reduction of cross-line trains.(3)Establish a space-time optimization model for cross-line trains and on-line trains based on capacity utilization.After the structural optimization is completed,for the crossline trains in the operation plan,set the adjustable time domain for the cross-line trains to enter the line according to the running distance of the train running path except for the Beijing-Shanghai high-speed rail line to form a train operation diagram suitable for the current operation plan,And then analyze the capacity improvement through the encrypted operation diagram.(4)Take the Beijing-Shanghai busy arterial line and some of the lines connecting it as a case study.Select the cross-line passenger flow in some directions,use the optimization method and model of this article,observe the optimized number of trains on the cross-line,the passenger load factor and the encryption of the operation chart,and analyze the improvement effect after optimization.This paper includes 31 charts,31 tables,and 69 references.