Research On Emergency Resource Allocation Of Urban Rail Transit Based On Accident Data And Multiple Traffic Modes

With the rapid development of social economy,the operation mileage of urban rail transit is also increasing rapidly,and the trend of network and scale operation is gradually formed.The expanding scale of the network makes the accidents in operation increase correspondingly.At the same time,the increasing passenger flow and diversified passenger flow characteristics further aggravate the consequences of the accidents.Rapid and effective emergency rescue is the key to reduce accident losses after the accident.Therefore,under the condition of network operation,how to optimize emergency resource allocation in the network is an important issue to ensure the operation order.Aiming at minimizing the time and cost of emergency rescue,this paper quantifies the impact of line network structure,Station passenger flow and historical accident data on emergency resource allocation in the form of station rescue value,and completes the emergency resource allocation model considering historical accidents.On this basis,an emergency resource allocation model considering multiple modes of transportation is further constructed.The main research contents are as follows:(1)Summarize the research status of emergency resource allocation of urban rail transit,and analyze the foundation of emergency resource allocation model.The impact of network structure,passenger flow,rescue cost and accident frequency on emergency resource allocation is analyzed to provide basis for the construction of emergency resource allocation model.Through the analysis of historical accident data,this paper summarizes the relationship between accident frequency and lines,operation companies,operation mileage,passenger flow,as well as the characteristics of accident spatial distribution,summarizes the existing problems in emergency rescue,and clarifies the necessity of emergency resource allocation.(2)The emergency resource allocation model of urban rail transit is established,which takes into account the network structure,passenger flow,historical accident data and other factors.Firstly,based on the classical P-Median model and aiming at minimizing rescue time and cost,an emergency resource allocation model without considering historical accidents is constructed.Secondly,based on the consideration of network structure,Station passenger flow and historical accident data,the calculation method of station rescue value is proposed.Considering that the probability of station accidents without historical accidents should not be zero,the value of station rescue considering regional historical accidents is proposed.An emergency resource allocation model considering the value of station rescue is established.Finally,considering the actual rescue process,the single mode of transportation rescue is extended to multi-mode of transportation rescue,and finally the emergency resource allocation model based on historical accidents and multi-mode of transportation is completed.(3)Taking the line network under the jurisdiction of Beijing Metro Trisection Company as an example,the parameters of passenger flow and rescue value of the station are calibrated according to the actual situation and solved by CPLEX.The validity of the model is verified by the actual accident occurrence,and the optimization effect of historical accident data and multiple traffic modes on the model is verified by comparing the results.In the result analysis of a single mode of transport model considering historical accidents,the most practical station rescue value is selected.Finally,sensitivity analysis of the number of emergency rescue stations and other important parameters is carried out,and its impact on the results is discussed.The case validates the validity of the model,which can be used for reference in the emergency resource allocation of urban rail transit.