Evaluation On Congestion Level Of Platform In One-Platform-Transfer Station In Urban Rail Transit

With the continuous expansion of the scale of urban rail transit system,the number of transfer stations and passengers are increasing.Passengers' pursuit of high-quality transfer experience is also enhanced.As the best form of transfer for passengers,the one-platform-transfer is bound to be more popular.The passengers'scale of the one-platform-transfer station is much larger than that of the general station.The passengers are concentrated on the narrower platform floor,which cause higher probability of congestion accidents.In view of this,this paper is devoted to studying and evaluating the congestion level of the one-platform-transfer platform and predicting the platform's situation that has not yet been operated,and quantitatively analyzing the influencing factors from design and operation.The main work is as follows:(1)This paper compared with the layout types and their advantages and disadvantages of the one-platform-transfer.The concept of transfer service level is discussed,and the evaluation index of congestion level is determined.The existing congestion level evaluation system is summarized and classified,and the evaluation system for this paper is selected.The applicability and limitations of the existing research methods are expounded,and the comprehensiveness research method of this paper is determined by using mathematical method and simulation method.(2)Mathematical interpretation model is established to evaluate the overall congestion level of platform.From the point of view of different platform area have different utilization ratio,the concept and calculation formula of platform equivalent area are put forward,and automatic drawing and calculation are realized by Python.Passengers are divided into three categories,and their distribution laws are studied respectively.A calculation model of passengers'number is established,and fast calculation method is realized by Python.Confirmed by actual data,the error of mathematical interpretation model is about 9%,which has strong credibility.(3)Established a simulation model by Anylogic to evaluate the local congestion level of the platform.Based on the existing functions,the key indicators such as pedestrian density thermogram,maximum/average/minimum density of local area and pedestrian flow intensity can be output by calling built-in functions to write Java code in real time after further development,which has strong reducibility to platform.(4)Design 12 platform schemes for a one-platform-transfer station.Evaluate the congestion level of each scheme.The optimal platform scheme is obtained by comparative analysis.In the evaluation process,it is further proved that the calculation results under the concept of equivalent platform can reflect the situation of platform congestion better.(5)Quantitative analysis is made on the influencing factors of congestion level.The maximum number of passengers is much affected by the variation of arrival time difference between two trains from the operational level,which is the largest when two trains arrive at the station at the same time,which is the smallest when the process of getting off the rear train and the process of getting off the front train at the same time.From the design point of view,the overall congestion level of platform improves by 6.47%with the increase of platform width by 0.5m;the local congestion level of platform deteriorates by 13.29%with the increase of staircase width by 0.5m;the congestion level of bilateral staircase is 29.54%better than the central type.The centralized column is 28.50%better than the bilateral column.