Study On Route Schemes Comparison And Selection For Li Ji Freeway Of Xi City To Ji City

Freeway is an essential part of the transportation infrastructure.The construction of freeway is an extremely complex project,involving multiple aspects of planning,design,construction and so on.Whether the route scheme is reasonable or not will directly affect the economy,safety and comfort of freeway construction and operation stage.Thus,to comparison and selection of route schemes is one of the key steps in the whole process control of the freeway construction.In this paper,Li Ji Freeway between Xi City and Ji City,relying for the project,comprehensive collected project area social economy status and related planning,analyzed the main problems existing in the construction of regional conditions and existing roads.According to the influence factors of the topography and geology,town planning and environmental sensitive points,developed a handheld GPS devices,portable line function,realize the corridor route selection in the process of reconnaissance check,determined the route of the corridor.On the basis of traffic investigation and data analysis,forecasted the trend of regional social and economic development and determine the relationship between traffic generation and social and economic indicators.The traffic generation was predicted by the elastic coefficient method.Complete the traffic distribution in the future predicted by Follett method.Set up the planning network and use the balanced distribution method to forecast the traffic volume in the future.Based on the forecast of traffic volume,combined with the function of the road planning,the rationality of the grade of the highway planning was verified.The service level analysis is carried out,and the suitable technical standard is put forward.Combined of line selection and alignment design theory knowledge,the route corridor within the proposed route options available,and summarized the comparison and schemes of technical and economic indicators.The multi-attribute utility decision-making theory is introduced,and proposed a route schemes comparison and selection method based on multi attribute utility theory.Li Ji Freeway between Xi City and Ji City,as an example,constructed the decision index system of the typical attribute index of the alternatives,normalized attribute indicators to form a standardized decision-making matrix.Used the combination of serial rate method and expert consultation,the weight of each factor is determined.Used the power coefficient method,set up the schemes comparison and selection utility model,calculated utility,and completed the quantization and optimization of route schemes.The proposed method can provide reference for related theoretical research and engineering application.