| With the rapid development of Chinese high-speed railways,the road network is constantly being improved and the demand for cross-line passenger travel has increased leaps and bounds.Connectivity between cities in Chinese is also constantly increasing.As cities in the road network are mostly located on different high-speed railway lines,cross-line passenger flows must cross the line if they want to reach these cities directly.Therefore,the operation of high-speed railway cross-line trains plays an important role in China’s high-speed railway transportation organization.With the increase of the total mileage of high-speed railways,the road network structure of Chinese high-speed railways has developed from structure of single straight line to structure of complex network today,and the lines connecting nodes of city are no longer unique.At present,there are multiple effective operation routes between OD in the road network.The choice of operation routes is becoming diversified.Different operation routes schemes of cross-line train have different degrees of influence on line and station operations.In order to reduce the impact of cross-lines on the road network,it is necessary to study the operation routes of cross-line trains.In the context,the article investigates and analyzes the factors that affect the operation of high-speed railway cross-line trains from the perspective of stations and sections,and then explores the possibility and method of optimizing the route of cross-line trains.The main work of the thesis is as follows:(1)The research background is elaborated from three aspects: the complication of high-speed railway road network lines,the need for cross-line for cross-line passenger want to achieve direct access,and the diversity of operation routes between road network nodes.And it explained the practical significance of the study of the operation route of the cross-line train.The research status of high-speed railway train operation organization is summarized from two aspects about train operation model and train flow routing research,to clarify the research content and technical route ofthe article.(2)Firstly,the effective crossover nodes on the main high-speed railway train lines in Chinese are screened to divide each high-speed railway line into several sections.And the article makes a detailed survey and statistics of the number and proportion of the cross-line trains in each section.Then the article analyzes the situation that cross-line trains run in those sections from a macro perspective.The survey data shows that the operation of cross-line trains plays an important role in Chinese high-speed railway transportation organization,and it also shows that the research on the organization of cross-line trains has practical significance.(3)Starting from the two aspects of the station layout and the inter-station section line,the article qualitatively and quantitatively analyzes the actual operation situation of cross-line train at the cross-line station and the impact of different operating sections on train operation.Finally,according to the analysis results,it is concluded that there are five main factors affecting the operation of cross-line trains:the layout of the station yard,the technical operation of the train’s reversing and turning inside the station,line connection station method,the busyness of the section line,and the operating speed of the section line.(4)According to the main influencing factors the operation of cross-line trains,and combined with the structural characteristics of Chinese existing high-speed railway network.In the article,whether to choose to cross the line at the station,to choose the direction of the operation line,and whether to cross the line are used as decision variables,and the article introduces parameter of the line section influence into the model.Then the article takes the logical constraints about related decision variable and constraints of known variable as the constraints of the model,to construct a multi-objective optimization model with the shortest total train running distance,the smallest total train running time,and the smallest section line impact as optimization goals.By introducing an evaluation function,the article uses these three optimization goals as the index factors of the evaluation function,Then the three index factors are quantified,and the unified process is carried out.Through the hierarchical analysismethod of group decision,it is determined that the weights of three index factors are0.3664,0.4597,0.1739,The multi-objective optimization problems is transformed into single-objective optimization problems.Then,the article quantitatively analyzes the four factors of station crossing probability,influence capacity of section line,line speed difference,and the effect of commutation and return technology to determine the parameter value method in the model.Finally,this article uses Taiyuan-Nanjing,Jinan-Chengdu,Lanzhou-Hangzhou,Beijing-Chongqing as examples to apply the model. |
