Study On High-Speed Railway Network Line Planning For Extra-Long Distance Passenger Flow

China has the longest mileage and the largest scale high-speed railway network.The length of high-speed railway(HSR)in service had reached 25,000 kilometers which was more than 60 percent of the HSR in the world in the end of 2017.Because of the development of the HSR network,which makes the network topology changed and provides rapid transfer condition.Our country with a vast territory and unbalanced economic development,create HSR demand with extra-long distance.It's necessary to research this problem specifically.There is few research about demand with extra-long distance in HSR network and difficulties of network line planning because of demand with extra-long distance.The paper try to study on HSR network line planning for extra-long distance passenger flow from characteristic of demand with extra-long distance.The paper systematic analysis demand and transportation organization mode of passenger flow with extra-long distance.Implement the method of transit assignment for HSR network considering passengers' whole process of travel.Put forward direct and transfer transportation mode for passenger flow with extra-long distance.Build HSR network line planning optimal model for extra-long distance passenger flow based on line plans.Then,study on high-speed night passenger trains' line planning considering extra-long distance transportation for direct transportation.Last,Baoji-Lanzhou HSR and other lines as used as an example to demonstrate the effect of presented model.More contents are listed below:(1)Demand and transportation mode analysis of HSR extra-long distance transportation under the condition of network operation.Confirm the range of extra-long distance for HSR based on competition between different modes of transportation.Analysis production of ultra-long distance transportation demand according to features of new HSR lines and complex network theory.Analysis transportation modes for passenger flow with extra-long distance and difficulties of direct and transfer transportation.Determination criterion is proposed about direct and transfer transportation.(2)Research on transit assignment for HSR network considering passengers' whole process of travel.Reconstruct HSR transportation network considering transfer transportation for ultra-long distance.Construct network considering factors of reconstructed network and passengers' whole process of travel.Build a transit assignment model for HSR network considering passengers' whole process of travel and ultra-long distance transportation.The assignment model aims at solving complicated and various paths for ultra-long distance transportation.Initial solution of line planning optimal model is solved out based on the transit assignment model.(3)HSR network line planning optimal model for extra-long distance passenger flow.The system centrality method is put forward to solve transfer problem for ultra-long distance transportation.Selection method of transfer scheme considering features of transfer hubs mainly is put forward.Direct and transfer line plans of ultra-long distance is loaded in network line planning optimal model to solve the complicated problem.(4)Research on high-speed night passenger trains' line planning considering extra-long distance transportation.First,analysis the relationship of transportation distance and travel time in different modes to confirm the range of ultra-long distance for high-speed night passenger trains.Analysis demand of high-speed night passenger trains.Second,put forward differentiation strategies and model according to difficulties of extra-long distance high-speed night passenger trains' organization.Last,analysis expression of high-speed night passenger trains conflicts under skylight constraint.Space-time mitigate strategies is put forward to solve the problem.Build the train operation and skylight optimal model based on space-time mitigate strategies.The main innovations of this paper are as follows:(1)Construct network considering passengers' whole process of travel to solve transfer problem in hubs of ultra-long distance transportation.Complicated and all-round path information can be described when combine the network with transit assignment model.The model contain constraints of carrying capacity,station arrival departure capacity,capability of passenger distribution.This method is the innovation of the theory especially for the network with rings.(2)Put forward HSR network line planning optimal model for extra-long distance passenger flow.The model breaks through maximum direct passenger mode while solving complicated OD pairs and over-line transportation problems.The difficulty of comprehensive optimization with direct line plans and transfer line plans is solved at the same time.Line planning optimal model have a certain meaning and application of innovative.(3)Put forward optimization strategies for different modes and differentiation operation model for high-speed night passenger trains' line planning considering ultra-long distance transportation.Optimization strategies for different modes are put forward to solve the relationship of trains and skylight constraints.Unbalanced problem of each section's skylight duration is solved.This method provides a new idea for successful implementation of high-speed night passenger trains.(4)Construct trains operation and skylight optimal model based on space-time mitigate strategies.The model describe the relationship of multiple trains and skylight especially in overlapping sections.The method can be used to solve complicated transportation of high-speed night passenger trains.The method have a certain application of innovative.