Turn-back Capacity Research Of Urban Rapid Rail Transit Terminal Station Based On Multi-factor Analysis

In recent years,the rapid development of urban rapid rail transit in China is second only to subway in the operating mileage of urban rail transit.At the time of large-scale construction of new lines in urban areas,the key to the development of urban rapid rail transit in the future is to further optimize and enhance the turn-back capacity of stations,reduce the restriction of turn-back capacity on line passing capacity,and give full play to the important role of urban rapid rail transit in the construction of metropolitan areas and urban agglomerations.The turn-back capacity of urban rapid rail transit terminal station is affected by many factors,such as line and station infrastructure,signal system and operation organization scheme.As the key line of train turn-back operation,too long turn-back line will increase project investment,and too short turn-back line will affect turn back capacity and train operation safety.In this paper,based on the existing technical specifications of urban traffic,starting from the characteristics of urban rapid rail,and fully considering the economy,efficiency,safety and other factors,the terminal turn-back capacity is analyzed.Firstly,the paper analyzes the development status of domestic and foreign urban rapid rail transit and the research status of turn-back capability,and proposes to analyze and optimize the turn-back capability of terminal station according to the technical characteristics of urban rapid rail transit.Secondly,based on the common types of turn-back operation in urban rail transit,this paper analyzes the calculation method of turn-back capacity,and focuses on the key factors affecting the turn-back capacity under the urban rapid rail transit system and the design requirements of urban rail transit for turn-back capacity.Thirdly,based on the safety distance,the turn-back capacity optimization model is established based on the length of turn-back line.According to the train dynamics,the influence of key factors such as switch speed limit and stop time on the turn back capacity of the station is analyzed,and the impact evaluation model of turn-back capacity is established by using analytic hierarchy process.Based on the quantitative analysis of the influence of safe distance and switch speed limit on turn back ability,the paper gives the suggestion of 42 m for safety distance.Combined with particle swarm optimization algorithm,the theoretical minimum turn-back interval is 119 s and the safety distance is44 m,and the turn-back line length conforms to the safety principle.Finally,based on visual studio environment,using C++ language to develop the terminal turn back ability simulation software,combined with the actual station,vehicle and line conditions to calculate the terminal turn-back ability,and combined with the actual city station,the terminal turn-back ability is simulated.The software results are true and reliable,which can provide reference for the actual engineering design.There are 46 figures,20 tables and 55 references.