| With the steady development of high-speed rail construction in China,the railway running mileage is increasing,and its network structure is becoming more and more complexed,which leading to the increasing proportion of cross-line transportation.The crossline train layout scheme covers a series of processes from the passenger flow analysis to when the running line completely distributed on the train diagram.A reasonable layout scheme can better adapt to the demand of passengers,on the other hand it can bring economic benefits to the transportation enterprises.Therefore,it is necessary to carry out an in-depth research on the layout scheme of the cross-line train operation line.At present,the background of high speed railway train is quite different from that in the early stage: At the early stage of high-speed railway construction,the line is relatively closed,so its capacity is surplus,and because it often connects with the existing line,the train on line is mixed with different speed grades.Nowadays as the links between high-speed rail lines are becoming much more closely,some of the main railways highlights the tension of its capacity,and part of the main railways begin to use the same speed grade train running mode.Therefore,based on the different background above and summarizing the existing research results,this paper studies the classified layout scheme of high-speed railway cross-train operation line.Firstly,this paper constructs the theoretical system of the layout scheme of the cross-line train operation line under the traditional background,and detailly summarizes the layout process,its influencing factors and its key problems.Secondly,this paper discusses the limitations of existing layout schemes under new the new situation,puts forward a new layout scheme of cross-line train operation line,systematical y studies its layout process,constructs an optimization model of operation line for its core problems,and designs a heuristic algorithm to solve it.The main research work of this paper is as follows:(1)The paper summarizes the characteristics of the mode of foreign transport organization,and on this basis leads to the mode of transportation organization that adapts to the current situation of China’s high-speed railway organization pattern;The paper summarizes the characteristics,principles and process of working drawing of high-speed railway train diagram.(2)The paper analyzes the characteristics of in-line and cross-line transportation organization pattern,constructs the theoretical system of the traditional layout scheme of the cross-train operation line with different speed grades,and summarizes the layout process of the scheme.The paper analyzes the influence factors of layout scheme of the cross-line train operation line,which include cross-line passenger flow structure,skylight scheme,node and line capacity,EMU Operation and other factors.The paper solves the key problems in the layout scheme of the cross-line train,which include the selection of the connecting nodes and the determination of the time domain of the train’s reasonable arrival and departure.(3)Under the condition of the same speed grade train running in a collinear way,combined with the background of high-speed railway’s tight capacity,the paper discusses the limitations of traditional layout scheme.In this paper,a new type of theoretical system of the layout scheme of cross-line train operation line is put forward,and the layout process of the scheme is elaborated in detail.Aiming at the core problem of “Optimization problem of operation line selection”,aiming at the optimization of the use of EMU and the total train travel time,considering the restriction about the time domain of train reasonable arrival and departure,the train operation plan,the requirement of safe driving and so on,the paper constructs a "0-1" integer programming model,and designs a heuristic algorithm for solving the model auxiliarily.(4)The paper takes the Beijing-Shanghai high-speed railway as an example to describe the specific process of new layout scheme of the cross-line operation line,which includes those steps about passenger flow structure analysis,the compilation of standardized train operation diagram,and the train line selection.By using the given cross-line train operation scheme,the paper reduced the complexity of the model,the design of a heuristic search algorithm to verify the feasibility of the model and applicability;Finally,by comparing the new layout scheme and the traditional layout scheme,the advantages and disadvantages of the new layout of the Beijing-Shanghai high-speed railway will be obtained. |
