Optimization Of Intercity Railway Train Stopping Scheme Considering Accessibility

Under the background of regional integration and coordinated development of urban agglomerations,economic,political and cultural exchanges between cities are becoming increasingly close.As an intercity railway that mainly serves the travel of passengers between cities,it needs to provide satisfactory services for travel within the urban agglomeration.Compared with urban rail transit,intercity railway trains run less frequently and stop trains less at stations.Inter-station accessibility has become an important indicator that affects the convenience of travel for passengers.It is also an evaluation index to measure the service level of railway transportation organizations.From the perspective of accessibility,this paper studies the impact of different intercity railway train stop schemes on accessibility.The main research work and conclusions are as follows:(1)On the basis of investigating the domestic intercity train station plan and the research status of accessibility,the relationship between the intercity railway train station plan and traffic accessibility is analyzed.Starting from the concept,basic components,setting principles and influencing factors of the intercity train station plan,this paper analyzes four basic station modes commonly used by intercity railway trains;the concept of traffic accessibility and the factors affecting traffic accessibility are sorted out.Through the analysis and comparison of five commonly used accessibility measurement methods,the accessibility evaluation method in this paper is determined,that is,the gravity model method.(2)The station level is divided,and then the meanings of intercity railway station accessibility,line accessibility and passenger OD travel demand accessibility based on the stop scheme are defined from the perspectives of transportation organization scheme and passenger travel demand.According to the principle of gravity model method,the meaning of spatial impedance and the number of interaction opportunities between two points in the parking scheme is analyzed,and the accessibility model is established from three perspectives of quantity scale,service quality and location attributes.The relationship between the elements of the stopping scheme and accessibility is analyzed,and the influence mechanism of different stopping schemes on accessibility is studied,which lays a foundation for optimizing the stopping scheme to improve the accessibility level of the line.(3)On the basis of the traditional accessibility concept,an optimization model 1 of the train stop scheme is established with the optimization objectives of minimizing the accessibility deviation and the minimization of train operating costs,and an optimization model 2 is established with the optimization objectives of maximizing the line accessibility and minimizing of train operating costs.And the model solving algorithm of "linear weighting + genetic algorithm" is designed.(4)Taking the Changsha-Zhuzhou-Xiangtan Intercity "Changsha West-Xiangtan" section as an example,the empirical analysis is carried out,and the OD service frequency sensitivity analysis is carried out on the premise of the remaining model parameters unchanged.The research results show that: compared with the initial scheme,the optimal stopping scheme obtained by the optimization model 1 reduces the accessibility deviation by 41.82,and is optimized by 42.39%;the train operating cost is reduced by 51,480 yuan,and is optimized by 23.26%;and the model shows a trend that the lower the frequency of OD services at each level,the better the optimization effect of both;the optimal stopping scheme obtained by the optimization model 2,the line accessibility is improved by 4.53 compared with the initial scheme,and the optimization is 70.34%;the train operating cost is also reduced by 16,800 yuan,and the optimization is 7.59%;and the model shows a trend that the lower the OD service frequency of each level,the worse the line accessibility optimization effect and the better the train operating cost optimization effect.Finally,by analyzing the change of the objective function value before and after optimization and the influence mechanism of the OD service frequency on the optimization effect of the train stop plan,it is concluded that the model established in this paper can effectively optimize the research objective,and further verifies the correctness of the model and the solution algorithm.