Study On Evacuation Capacity Of Xi’an Subway Transfer Stations Under Mass Passenger Flow

In recent years,with the rapid growth of urban population and the continuous expansion of urban scale,the state of mass passenger flow is becoming more and more normal,which puts the subway transfer station under unprecedented pressure.Under this condition,it is particularly important to ensure the safe evacuation of passengers under the normal and mass passenger flow of subway stations.Therefore,research on the evacuation capacity of subway stations,especially transfer stations with mass passenger flow pressure,is of great significance to the reduction of potential safety hazards when passengers are evacuated under mass passenger flow conditions.This paper studies the evacuation capacity of the station,taking the Xi’an subway transfer station as the research object,and the premise of the normal and mass passenger flow of the station,and finally put forward suggestions to improve the evacuation capacity of the station.The specific research content is as follows:(1)Understand the meaning of station evacuation capacity,and analyze the factors that affect station evacuation capacity,including station design factors,station evacuation organization and management factors,and passenger characteristics.Considering the factors affecting station evacuation capacity,determined the indicators to evaluate the evacuation capacity of the station are evacuation time,passenger flow density and evacuation bottleneck,which lays the foundation for subsequent research content.(2)The definition and characteristics of mass passenger flow and the current status of Xi’an subway passenger flow are summarized,and proposing a survey plan for the characteristics of mass passenger flow behavior.Then three representative subway transfer stations in Xi’an are selected to investigate and study the characteristics of mass passenger flow behaviors of different types of station facilities and equipment.Based on the survey data of mass passenger flow in Xi’an subway station,the speed-density relationship of passengers on different types of travel facilities is obtained,and the average travel speed of passenger flow in the state of mass passenger flow is corrected according to the psychological characteristics of passengers during evacuation.(3)Based on the related theoretical research of queuing theory,a single-facility M/G/c/c queuing model with passenger flow at escalators and passages is constructed,and the queuing model parameter relationship between upstream and downstream connected facilities is studied.The facilities are abstracted as nodes,and the connection relationship between facilities is abstracted as directed edges.Considering the transfer relationship between the output rate and the arrival rate between nodes,the facilities are connected according to the actual spatial structure in the station to form a station queuing network.(4)Based on the spatial structure of the station and other factors,the evacuation path planning is carried out.Considering the integrity of the evacuation path in the station,a path choice model based on passenger travel efficiency is constructed as the probability basis for passenger path choice.Calculate the evacuation volume and facility passenger flow density according to the calculation method of the station mass passenger flow evacuation capacity,path evacuation time and other parameters,identify bottlenecks based on the calculation results.(5)Take the example analysis of Xi’an subway transfer station-Xiaozhai Station.Validate the model algorithm and use micro-simulation software for simulation experiments.According to the calculation results of the model and the results of the simulation experiment,the paper puts forward suggestions to improve the evacuation capacity of mass passenger flows in subway transfer stations.