Research On The Layout Of Highway Passenger Stations Based On A Two-stage Stochastic Programming Model

Traffic and transportation is pillar industry of the national economy.As an important basic infrastructure of transportation system,passenger hub has many functions.The layout of the passenger station location is a strategic plan,which has a long-term impact on the city‘s travel.The existing site selection methods are generally limited to certain factors,but many uncertain factors exit in the development of passenger hub selection.Such as the uncertainty of construction costs and the uncertainty of passengers' outflows,the volatility of passenger flow is one of the major sources of uncertainty.Some tourist cities such as Chengdu,Lhasa,the road passenger flow may fluctuate with small vacations,winter vacations,etc.,and thus affect the layout of the passenger hub.Therefore,this paper focuses on the fluctuation of passenger outflows,provides new ideas and new methods for the layout of passenger hub.This paper first summarizes the research results of the layout and location of passenger hub.Study the passenger hub category and the development trend,and analysis the relationship between urban layout and location,point out the planning steps.Secondly,using grey relational analysis method to analyze the influencing factors of passenger hub selection,and use the least squares support vector machine method to predict the future passenger flow,calculate the future passengers' sending volume and direction sending;then determine the scale and number of land used for the passenger terminal to provide the basis for the site selection.According to the location influencing factors and scale forecasting results,the candidate site collection is obtained by the node importance method,and a two-stage random location model is established with the objective function of minimum construction cost and travel cost;the passenger station location is not affected by randomness.Location selection is the first-stage decision variable;the determination of passenger traffic is influenced by the uncertainty of travel demand as the second phase.Finally,the solving algorithm and solving program are designed according to the characteristics of the model.Finally,based on the proposed location method of the new bus terminal in Lhasa city,the layout of the bus terminal in Lhasa was obtained,demonstrated the feasibility of the model and provided a certain reference for layout of the hub location.