Research On Optimization Of Line Design And Allocation Of Feeder-Bus Under A Single Rail Line Service Disruption

Urban rail transit has become one of the main ways for urban residents to travel due to its large volume,fast speed,high punctuality,and low pollutio n.However,due to some irresistible factors,sudden disruptions in urban rail transit occur from time to time.Failure to take reasonable emergency measures in a timely manner will lead to line paralysis and a large number of passengers stranded,resulting in huge economic losses and serious social order disorder.Therefore,in the event of a sudden disruption of urban rail transit,the rail operating department needs to determine the extent of the accident,start a feeder service plan,timely and efficiently evacuate stranded passengers.Ground buses have the advantages of flexible mobility,convenient dispatching,and easy deployment.They are a favorable linkage support method for responding to passenger flow evacuating in a sudden disruption of urban rail transit.This article studies the optimization of the lines design and the allocation of feeder buses in a sudden interruption of the railroad.The aim is to provide a theoretical basis for the emergency decision-making of the rail operating department,and the main content of the paper is as follows:(1)Analysis of factors influencing the start-up of feeder bus plan under a sudden rail service disruption.Firstly,summarize the accidents and current start-up feeder bus plan of popular cities.Secondly,it figures out the influencing factors of starting the feeder bus plan,including location the disruption occurred,interval length of the disruption,time period,stranded passenger flow,fault duration,etc.Then,in order to analyze the mutual influencing relationship among the factors,an interpretation structure model(ISM)is constructed.Finally,according to the results of ISM model,we can find that the stranded passenger flow and fault duration are the fundamental factors affecting the starting of feeder bus plan.(2)Optimization model of lines design and feeder-bus allocation plan under a sudden rail service disruption Taking the rail service interruption scenario of a single line as the background,Firstly,the bus resources,passenger demand in the interruption interval,the number of routes,and the departure points of route are the limiting conditions,the objective is to minimize the evacuation service time of the feeder-bus to establish an optimization model of lines design and feeder-bus allocation plan.Compared with the traditional ones,the evacuation time of the feeder-bus plan is reduced by 16%.And the impact of the number of lines and bus resources on the solution value is analyzed.Secondly,considering the difference in forward and reverse OD passenger flow data,allowing forward and reverse stops different in the line,and obtaining an effective specific feeder-bus plan to solve the problem,the number of lines,the direction of the line,the line stop and the bus allocation are cleared.Compared with the traditional ones,the evacuation time of the feeder-bus plan shortened the evacuation time by 24%.Finally,adding the depot bus resource restriction in the model,and the optimal solution in this case results in a 23% reduction in evacuation time compared to the traditional line.(3)Algorithm design and case analysis.Based on the Genetic Algorithm to generate the scheme set of the line and bus combination,used the simulation method to calculate the solution fitness value,and the solution is programmed by Python software.Combined with the case,it proves that the model proposed in this paper is effective and feasible.