Research On Cross-line Passenger Flow Assignment Oriented To Capacity Releasing Of High-speed Railway Bottleneck Section

In recent years,with the rapid development of my country’s high-speed railway,the network structure tends to be complex,and the passenger flow has led to a continuous increase,so the bottleneck section has become more and more prominent in restricting network capacity.The capacity relieve of bottlenecks from a macro level is the fundamental guarantee for the network operations,and it has important significance for improving network throughput.Based on the complex high-speed railway network,this paper researches on railway passenger’s multi-path trip selection and allocation,and focuses on bottleneck section relief and improves the capabilities of passenger service.On this basis,a series of technical methods of enterprise-passenger dual criteria has constructed,including service path impedance function design,generation of reasonable service route alternatives,and adjustment of passenger flow in bottleneck sections,which provide decision support for the preparation of transportation organization.The specific research content is as follows:(1)On the basis of analyzing high-speed railway passenger transportation on busy trunk lines and capacity utilization,it is clear that the large number of cross-line trains is the main reason for the capacity bottleneck in the Xuzhou east to Bengbu south section,then researching the connection between the Beijing-Shanghai high-speed rail and other lines.Based on this,considering the current status of multiple lines in parallel and passenger multi-path trip,taking full use of the capacity of high-speed railway network as the goal,focusing on the research of the transportation path and transportation mode of the cross-line passenger flow in the bottleneck section,in order to realize the capacity relief of the bottleneck section from the macro level.(2)Put forward the concept of service path,and build a high-speed railway service network.Considering the game relationship between railway enterprises and passengers on service path selection,introduce the resistance of cross-line service to quantify the impact of cross-line behavior on line capacity loss and then construct a dual-criteria service path comprehensive resistance function including running side,transfer side and cross-line side based on the existing study.With the elimination of "small triangle network" as the constraint condition of path generation,a reasonable service path selection model under the complex high-speed railway network is established.Considering the multiple constraints of service path generation,a two-stage algorithm based on Yen’s algorithm is designed to realize path search and rationality checking.(3)In order to describe the multi-level nodes in the high-speed railway network,build a high-speed railway double-deck hybrid network.Adopt the non-aggregated passenger flow merging method based on the shortest path principle,and design an improved "two-side contrast algorithm" based on the Dijkstra algorithm.The selection of cross-line passenger flow in the bottleneck section is based on the direct mode service path,and the passenger flow level is divided based on the minimum resistance service path.Construct a random user equilibrium high-speed railway passenger flow distribution model based on a reasonable service path candidate set,and combine the MSA algorithm with the section equalization resistance function and the augmented Lagrangian multiplier respectively to design two capacity-constrained railway passenger flow assignment algorithms.(4)Build a high-speed railway case network with the goal of easing capacity of Xuzhou East-Bengbu South Section.And rovide bottleneck section capacity relief plan and general suggestions of cross-line passenger flow adjustment.