Operation Organization Adjustment And Optimization Under Urban Rail Transit Interruption

As China’s urban rail transit industry enters a period of rapid development,its role in the urban transportation network is becoming more and more irreplaceable,which also means that the fault tolerance rate of the urban rail transit system is getting lower and lower.Once an emergency situation leads to operation interruption and the automatic train control system cannot match the corresponding level of operation adjustment,the transportation system of the whole city may be paralyzed,Bring immeasurable economic losses and even potential safety hazards.Therefore,when the operation interruption is inevitable,it is necessary to minimize the impact of the interruption by other means,reduce the detention of passengers and improve the safety level.From the perspective of one-way operation interruption and two-way operation interruption,this paper discusses how to reorganize urban rail trains and feeder buses under interruption conditions,and puts forward corresponding solutions.The main research contents are as follows:(1)This paper analyzes the research significance of the problem,summarizes the relevant literature at home and abroad on passenger flow redistribution,train operation adjustment and bus connection optimization under interruption,and then analyzes the interruption reasons,train routing selection and operation adjustment strategy after interruption according to the characteristics of China’s urban rail transit,makes the actual response analysis under interruption,and solves the basic problems of operation organization adjustment.(2)Under the condition of unidirectional interruption,this paper mainly studies the train operation adjustment.Firstly,the passenger flow under interruption is redistributed according to the historical OD data.Then,based on the passenger arrival rate and alighting proportion,the count of passenger-stranded instead of the time of passenger-waited is taken as the optimization objective,and the indexes such as train operation time,stop time,arrival and departure time,passenger capacity,turn-back operation time and the number of turnaround are constrained to establish the optimization model.Through the improved particle swarm optimization,the problem is solved and the new train schedule is obtained.(3)Under the condition of bidirectional interruption,this paper mainly studies the optimization of bus bridging.Similarly,after the redistributed passenger flow is calculated,first establish the evaluation system of key nodes,determine the key nodes according to the bearing pressure,service level and capacity intermediary index of interrupted stations,organize the cross station bus connecting only through key stations,and establish the design model of bridging bus lines in combination with the connecting lines of the whole station,with the minimum total waiting time of passengers as the objective and the running time and as the constraint,the optimized results are calculated by enumeration algorithm.(4)Taking Metro Line 1of a city as the background,the train operation adjustment model under unidirectional interruption is calculated,and the stranded person times of the optimization scheme and other manual control schemes are compared in detail.It also optimizes the bus connection scheduling problem under bidirectional interruption,and adopts the mixed connection mode to reduce the overall waiting time of passengers.