Research On Cooperative Optimization Of Urban Rail Transit Passenger Flow Control And Bus Based Passenger Evacuation At Peak Hour

With the gradual advancement of urban rail transit construction,the demand for urban rail transit travel increases rapidly,and the contradiction between supply and demand is increasingly prominent.In particular,during morning and evening rush hours on weekdays,a large number of passengers are often stranded on commuter lines.At present,the research on mass transit transportation organization focuses on the operation organization of mass transit itself,but few people introduce emergency buses into the research of large passenger flows transportation organizations to conduct collaborative transportation.In view of the above problems,this paper proposes a combined shuttle strategy with station passenger flow control as the core and cooperative emergency bus connection service.Implementing passenger flow control at stations during peak periods can effectively reduce the phenomenon of overcrowding,and ensure operational safety at the station.But passenger flow control measures will inevitably cause station passengers to stay and harm passengers’ interests.Therefore,as a supplement to passenger flow control measures,this paper proposes an emergency bus shuttle service to meet the travel needs of stranded passengers.The main research work of this paper is as follows:(1)Aiming at the deficiency of the previous research on evacuation strategies for large passenger flows in urban rail transit,this paper proposes a research framework for collaborative evacuation organizations with passenger flow control as the core.and then a twostage mathematical model for optimizing the operation of the subway system during the peak passenger flow period was established,and the advantages of the two modes of transportation were combined to solve the problem of rail transit system congestion during the peak passenger flow period.(2)In the model of bus collaborative passenger flow control,according to the characteristics of bus collaborative evacuation,This paper considers the limitations of the minimum number of passengers in the station and improves the existing passenger flow control model.The improved model can identify the source of the large passenger flow in the restricted area and control it from the source.And clarified the question of when to control passenger flow and the number of people(3)In the process of bus route design,according to the limitation of bus shuttle time during the morning rush hour.a mixed-integer nonlinear programming model with limited resource utilization is established The model takes the number of control passengers as input parameters,and takes the maximum number of public transport passengers as the target,the bus departure interval,the connection time and the number of available buses as the constraints.The design of bus bridge lines makes it clear which lines should be a bridge between the stations and how many buses should be allocated to the bridge lines,and the bus departure interval.(4)Taking the morning rush hour of a working day of Chengdu metro line 1 as an example,the established two-stage model is verified and analyzed,and the corresponding coordinated transportation scheme is obtained.The results show that the scheme of connecting the subway service with bus shuttle during the peak period is feasible and meets the practical demand,which can effectively transport the stranded passengers and reduce the average delay time of the whole system.In general,this paper proposes a coordinated transportation organization strategy with passenger flow control,which is of great significance to relieve the station congestion during the peak period of large passenger flow and guide the actual operation organization of the station.The two-stage model of optimizing the operation of rail transit is a great theoretical value for the study of cooperative transportation organizations during the peak.