Study On Distributing Station In Linear City Urban Rail Transit Line

Linear city transportation is facing various pressures such as motorization and insufficient supply.Rail transportation is supposed to solve the problems of urban traffic in Linear city.However,the layout of rail line sites will directly affect the effectiveness of the benefits,and it will also have a far-reaching impact on the district development,population density along the line and the layout of urban spatial structure.At present,Linear city urban rail transit has just started planning and construction,and it lacks research on the layout of urban rail transit stations in Linear city.The site layout design,which mostly depends on the experience of the layout of plain city clusters,results in an unreasonable layout that affecting the function of rail transit.Therefore,the study on the layout of urban rail transit stations in strip cities and the comprehensive evaluation of distribution schemes have important theoretical and practical significance.Based on the analysis of the factors that influence the layout of urban rail transit stations in Linear cities,this paper takes the characteristics of the Linear cities and its urban transport system into consideration,and always implements the basic concept of “people-oriented,ondemand deployment” and proposes a “four-phase method” layout of urban rail transit sites with tripes.Gives alternative site selection and screening methods and steps;in addition,redefine the calculation model of passenger flow coverage at rail transit sites.Considering the total cost and total benefits of rail transit,the rail transit project's traffic benefit calculation model was introduced,and a site layout optimization model based on the maximization of comprehensive benefits,was constructed in terms of total cost,economic benefits,traffic benefits,and social benefits.Also including constraints,the objective function and using the quasi-Newton method to solve the model.This paper calculates the optimal coverage ratio when the distribution plan's number of sites is same,and establishes an evaluation system for the distribution of urban rail transit sites with 11 indicators in five aspects in different layout plans for the number of sites;The introduction of the " gray relevance analysis model based on entropy weight" solves the problem of information dispersion and evaluation index weight being influenced by humans.The 11 evaluation indexes of multiple solutions are concentrated on the weighted relevance degree to facilitate comparison,and the optimal solution is obtained through MATLAB programming calculation.Finally,taking Baoji City's urban rail transit as an example,the method model was validated by using actual survey data and passenger flow forecasting data,and the optimal station distance of Baoji City's Urban Rail Transit Line 2 was 1198 m,and the optimal layout was obtained.