Study On The Ring Line Of Urban Rail Transit

There are 9 cities have already planned ring line of urban rail transit in china,and there are 7 cities have carried out the preliminary study.With its fast and convenient features,the ring line can meet the needs of the passengers traveling on the line and connect the central area and the peripheral groups,and support the development of the city from the single center to the multi-center and contribute to the sustainable development of the city.When concerning its special structure,it has been a controversial issue in the network planning for its use.How to determine its set is a very important issue.On the basis of summing up the existing research results,this paper has analyzed the characteristics of the ring line which were different from other railway lines by collecting the operation,planning and construction materials of domestic and foreign ring lines.Through the analysis of the function and the disadvantages of the loop,the paper has put forward the necessity of the establishment of the ring line,and considered the setting conditions from the quantitative and qualitative point of view.At the same time,it analyzed the factors affecting the reasonable economic length.Finally,three methods(the balance of profit and loss,the relative net benefit maximization,break-even)were used to analyze the length based on the above three points.For a precise calculation,it has improved the model when considered the government subsidy,station spacing and diversified development.First of all,this paper has analyzed the factors that affecting the line length,and obtained the value range of some influencing factors,and then classified the related benefits and costs,and established the model at last.It pursues the balance of profit and loss at first,if feasible,then pursue the relative net benefit maximization,and analyze the relationship between the related factors and benefits.If the maximum benefit is negative,then pursue the breakeven length and judge the disparity.Conversely,it assumes that the planning length is the breakeven length.According to the the government subsidy and diversified development,it deduces its extent for the blance.