Research On Optimization Of Bus Lines Around Subway Stations For Multi-mode Cooperation

Traffic problems such as road congestion and the increase in the number of private cars are becoming more and more serious with the development of cities.Improving the public transport sharing rate can effectively solve the traffic problems,implement the multi network integration policy,and improve residents’ travel happiness and convenience.This paper focuses on the "multi network integration" strategy,focuses on the two most important networks in the urban "multi network integration",namely rail transit network and public transport network,and promotes the transfer efficiency between the two networks.Study the transfer system around the subway station,scientifically evaluate the bus line network along the rail transit and design the bus connecting lines,so as to realize the coordinated development of rail transit and ground transportation.Firstly,this paper establishes the evaluation model of bus lines around subway stations.Nine indicators of public transport network along rail transit are determined from three aspects: the rationality of the network itself,the cooperation with rail transit and the cooperation with other modes of transportation.The weight of criterion layer is determined by analytic hierarchy process,and the weight of index layer is determined by improved entropy weight method to construct the evaluation index set.Then,the unascertained measurement model is selected as a tool to evaluate the bus line network around the subway station.Then,this paper establishes a bilevel programming model to design the bus network around the subway station.Firstly,the k-short circuit algorithm is used to obtain the alternative route,and then the bilevel programming model of bus connection network design is established,in which the passenger flow changes with the change of connection system.The upper model aims at the lowest total travel cost of passengers,and takes the line length and the number of lines allowed by the station as constraints.The lower level model allocates the passenger flow based on logit model,and calculates the allocation of various traffic modes and the passenger flow of each traffic line at the demand point.The upper and lower layers of the model interact with each other.Finally,it is solved by double-layer genetic algorithm using MATLAB platform.Finally,taking Beijing National Library Station as an example.Based on the field investigation,the public transport situation around the national library station is analyzed to determine the necessary parameters involved in the model.Based on this,the public transportation network around the subway station of the national library is evaluated,and the surrounding public transportation network is designed.It is proved that the model and algorithm in this paper are effective.