Research On Key Technologies And Route Schemes Of Urban Rail Transit Co-line Operation

With the rapid development of the construction of our country’s metropolitan area in recent years,in view of the new requirement of the transportation integration construction,the National Development and Reform Commission has put forward the concept of “ Four networks integration ”,that is to promote the trunk railway,inter-city railway,Municipal Railway and urban rail transit integrated transport network construction,so the choice of the link between the lines is the focus of the study.Among them,the straight-through operation mode is the collinear operation mode studied in this paper.As the backbone of urban public transport,urban rail transit(URT),due to the distribution characteristics of passenger flow and the limitation of route planning in its operation,leads to the limited service range of some lines and the excessive pressure of transfer stations,problems such as low level of resource sharing.Compared with the transfer mode,the collinear operation mode can solve the above problems.Based on urban development planning and major passenger flow factors,the diversification of route orientations and modes and train routing schemes has prompted the operators of urban rail transit to begin to adjust and optimize train routing schemes,in order to meet the demand for passenger flow at the same time,to make full use of line resources,to reduce the operating costs of enterprises,and to ensure that the service level of urban rail transit line in the benchmark.On the basis of reading and studying the relevant literature at home and abroad,and combining with my own ideas and viewpoints,this paper first makes a deep research on the key problems of rail transit co-line operation,and then constructs a multi-objective optimization model of Y-type urban rail transit intersection scheme,finally,the NSGA-ii algorithm is used to solve the model.The main contents of this paper are as follows:(1)the definition of collinear operation of rail transit is clarified,the characteristics of main collinear operation forms at home and abroad are pointed out,and the application status of various collinear Operation Forms is expounded,this paper analyzes the technical difficulties in the co-operation of urban rail transit with inter-city and inter-city trains,and analyzes the applicability and operation characteristics of the three co-line transportation organization schemes.(2)the classification of collinear operation and its application status at home and abroad are expounded systematically,and the adaptability of each collinear type of passenger flow is analyzed according to different characteristics of passenger flow;This paper probes into the advantages,disadvantages and adaptability of the wiring forms of the common stations,the turning stations and the connecting stations on the collinear line,and draws some typical illustrations.(3)the internal and external causes of the formation of Y-type urban rail line are analyzed;the characteristics and applicable conditions of five Y-type urban rail line interchange schemes are studied;This paper analyzes the limitation of waiting time with 1/2of the train departure interval as the passenger waiting time,and expounds the steps for formulating the train routing scheme of Y type urban rail line in detail.(4)taking the shortest passenger travel time and the lowest operating cost of the enterprise as the optimization objectives,taking into account the constraints of the upper and lower departure frequency of each intersection,the minimum track interval of trains,the capacity of turning back stations,the full load rate of trains and the maximum number of undercarriages,an optimization model of Y type urban rail transit route scheme is constructed,and an algorithm based on NSGA-ii is designed.(5)taking a Y type urban rail transit line in China as an example,and taking short-term and long-term OD passenger flow data as input condition,using NSGA-ii-based model algorithm,the optimal routing scheme is generated and the related index calculation results are outputted;Combined with the original route scheme and optimization scheme,the feasibility suggestion is put forward after comprehensive analysis,and the influence of the variation of the model parameters on the solution of the model and the route scheme is analyzed.