Study On Urban Rail Transit Line And Station Layout

Urban rail transit is a kind of rail transit line connecting the main urban area and urban area groups,connecting the main cities and towns along the line and the external transportation hub within the administrative jurisdiction of the city or metropolitan area.The technical indexes such as the location of starting and ending points,the length of lines,the average distance between stations and the running speed of urban rail transit lines play an important role in realizing the functional positioning of urban rail transit.The different location of starting and ending points will lead to the change of line length.Under the restriction of the target value of one hour travel time in the whole journey,the higher the train running speed is,the larger the maximum allowable line length is,and the line length will affect the number of station layout;the size of average station spacing will be affected by the train running efficiency and the density of station layout.In order to better realize the functional positioning of urban rail transit,this paper studies the line and station layout of urban rail transit.Firstly,this paper analyzes the relationship between urban spatial structure and the development of urban rail transit,and clarifies the functional orientation and service characteristics of urban rail transit.Then,based on the realization of the function orientation of urban rail transit,the basic technical characteristics of urban rail transit lines and stations are analyzed.Secondly,this paper makes a detailed analysis of the main technical indicators of urban rail transit lines: analyzing the relationship between the starting and ending points of urban rail transit lines and the line length,establishing the optimization function of line length with the maximum comprehensive benefit value as the goal;considering the train operation efficiency,establishing the optimization function of station spacing with the minimum passenger travel time as the goal;considering the population density along the line On the basis of the above analysis,the paper puts forward the method of station layout: on the premise of the basic determination of online position trend,according to the constraints of station spacing,the method of arc drawing is used to generate the station layout scheme.Then,based on the above research,this paper proposes a two-level layout and location optimization model for urban rail transit stations.The upper level model aims to maximize the comprehensive benefit value considering the variable length of station coverage,and the lower level function aims to minimize the travel cost value of passengers taking urban rail transit in the main urban area.The upper level model is actually based on the line The length optimization model is transformed from continuous line length to discrete station location,and the difference of comprehensive benefit value under different station layout plans is discussed.The change of line length brings about the change of connection mode between the line and urban rail network,while the lower model is actually caused by the difference of connection mode between urban rail lines The difference in the travel cost of passengers in the city.The simulated annealing algorithm is used to find the optimal solution for the bilevel programming model.Finally,Take Xi’an rail transit line 10 as an example to verify the practicability and feasibility of this study.