Emergency Bus Bridging Services Optimization Planning Of Urban Rail Transit

Urban rail transit is regarded as an important measure to solve urban traffic problems and ease road traffic congestion.Many cities in China are committed to building urban rail transit systems.As urban rail transit network becomes more and more mature and complicated,the networking operations and the management of large passenger flow make this complex transportation system face many new problems and challenges in emergency response.When the urban rail transit system breaks down,it is necessary to evacuate passengers.Emergency bus bridging service is an important approach for emergency evacuation of urban rail transit,and its core content is emergency parking site selection and bus bridging route planning.Aiming at emergency bus bridging service problem,the purpose of this paper is to establish a reasonable urban rail transit emergency bus parking site allocation model,and to optimize the emergency bridging bus route design.Through the study of a case based on the actual road network and passenger flow data in a certain area,the effectiveness of the model established in the article is verified,and this article gave an optimization of emergency bridging route design.The main work includes the following aspects:First of all,this paper summarizes the emergency strategies and the prerequisites for providing the emergency bus bridging service for urban rail transit emergency interruptions.After the analysis of the classic site selection model,this article summarized the characteristics of the site allocation of emergency bus parking spots,and different emergency bus bridging service modes are discussed according to the coverage of emergency bus routes.Secondly,with the goal of minimizing the delay time of the bridging and minimizing the number of emergency bus backups,considering the demand for emergency connection of the station to be connected,subject to the parking capacity of the parking point and the demand of the connection station,this paper establishes the emergency bus parking site allocation model,and it uses an adaptive genetic algorithm to solve the model.Thirdly,this paper proposes a design method for emergency bridging bus routes.Based on the construction of the time-space network of the road network,with the goal of minimizing passenger delay time,taking into account the actual connection distance from the parking point to the connection station,considering the constraints of conserved passenger flow in the road network,parking capacity of parking points,and vehicle capacity,an emergency bridging bus route design model is established to obtain the direction and departure interval of emergency bridging bus routes in case of sudden interruption,and the solution method is designed based on the general branch and bound method.Fourthly,a case study is carried out by using actual road network data and passenger flow data in a certain area of Beijing.The site selection and allocation results of whether to consider the emergency demand of connecting stations are compared.The location allocation result considering connection demand can greatly reduce the bridging delay time of the stations with higher weight and it makes stations with higher demand get better service.At the same time,the effects of emergency bus bridging service in the case of standard alternative and supplementary bridging are compared.The results show that adding supplementary bridging routes can significantly reduce passenger delay compared with the standard alternative connections.In addition,the proportion of passengers who fail to board the bridging bus due to long-time waiting for the bus and the lack of patience also decreases.Figures 29;Tables 21;Reference articles 72...