Study On Emergency Evacuation Plan For Urban Rail Transit

With the expansion of the city scale and the increase in people's travel distance,people's dependence on rail transit is getting higher and higher.During peak commuting hours,a large number of passengers choose rail transit as their travel mode.However,under certain emergencies,rail transit may also be interrupted.At this time,not only will passengers be delayed in a large number of trips,but a large number of passengers will gather within the subway station within a short time,increasing the probability of stamping accidents.Therefore,the evacuation of the stranded passengers using the feeder bus has become the research hotspot of the current evacuation problems.It has important significance for public safety and emergency events,reduction of passenger delay events and reduction of economic losses.First of all,we will study the selection behavior of passengers in emergencies in emergencies.In the event of a disruption to urban rail transit in the event of an emergency,passengers' alternative transportation options include regular buses,feeder buses,taxis,or internet vehicles.Therefore,it is clear that the passengers will choose to connect the bus in what kind of circumstances,and it will be of great significance to determine the evacuation demand of the emergency bus afterwards.In the research process,a questionnaire survey method was used to preset four preset scenarios with different travel distances and different rail transit interruption times.By analyzing the results of questionnaire surveys,passengers' selection behavior patterns were obtained.Secondly,the relevant thinking of queuing theory was used to determine the starting threshold of emergency bus.The launch of emergency feeder buses should be related to the degree of impact on passengers after rail transit is suspended.At present,the domestic research on this aspect is relatively simple,and only the outage time is used as the basis for starting the emergency connection bus.In fact,if it is at the peak of commuting,the flow of people will quickly gather within a short period of time.In this case,if emergency transit buses cannot be started in time,serious consequences may result.This article refers to the related thinking of the queuing theory,considers the subway as a service system with a length limit,the subway station as a service desk,and divides customers into passenger transfer passengers,general passengers,and subway passengers according to their sources,according to their arrival distribution.Calculate the arrival rate of passengers,divide them into stranded subway stations and leave subway stations according to the passengers' selection behavior,and determine the departure rate.At the same time,define the capacity of the subway platform based on the area of the subway platform,according to the arrival rate and distance.The rate of detours and the capacity of the station,through the quantitative calculation of the emergency start-up bus transit start threshold.Subsequently,an analysis of the evacuation plan for emergency bus services can be divided into the following sections:Firstly,on the basis of the passengers' choice behavior,combined with the passengers' composition of the site,the evacuation requirements of the emergency feeder bus at the site are calculated and calculated.At the same time,because the emergency feeder bus is circulating between the stations that are out of service,one-way evacuation needs can be calculated from one back to the next,taking the maximum in both directions as the overall evacuation demand.Second,using the improved Dijkstra algorithm to solve the shortest evacuation path.In other words,the Webster model is used to calculate the intersection delay and the intersection delay is used as the weight of the node.The road network is abstracted into a network graph with both nodes and edges having the right value,and the calculation is performed according to the Dijkstra algorithm to find the shortest distance.Evacuation path.Then,on the basis of the above studies,based on the arrival and departure rates of passengers,combined with the departure characteristics of emergency buses,a quantitative calculation method for the waiting time delay of passengers was proposed,and a study was conducted on the existing location of emergency facilities and the existing Several classical models were analyzed and compared.Finally,a P-median model was used as a storage site selection model for emergency bus access.At the same time,passenger delay calculation method was used to calculate the delay time as a site selection plan.The value of the objective function is based on and based on this decision is made on the siting scheme.Finally,during the peak hours and peak hours,the deployment plans of emergency buses were analyzed.At the time of Pingfeng,the deployment plan of the emergency bus does not need to consider the impact on the existing public transport network.Therefore,the ideal bus allocation plan can be proposed based on the comparison of the time of the emergency bus connection between the interrupted sites and the suspension time.During peak hours,reference can also be made to the calculation method of the bus deployment plan during the peak hours to determine the upper limit of the deployment plan.At the same time,the original bus line,which is the source of the emergency connection bus,is included in the scope of analysis,and the calculation is different.The additional delays caused by the deployment plan are also calculated for the delays of rail passengers staying under different deployment plans,and they are given a certain amount of weight.The weights are expressed in terms of the size of the weights.Weighed and proposed an algorithm for solving the optimal solution.Finally,taking the rail transit system of some provinces and cities as a case,using the above methods,the startup thresholds of emergency bus connections for subway stations,evacuation requirements,evacuation routes,storage site selection plans for emergency bus connections,and flat peaks were analyzed and calculated.Emergency bus deployment plan in peak conditions.The research shows that the research results can help determine the evacuation plan for emergency transit buses in urban rail transit,which is feasible and scientific.