Analysis Of Theory And Method For Optimization Of Staggered Maturation Highway Network Layout

Reasonable layout can improve the integral efficiency of the highway network,better support and promote the regional social and economic development.Especially the scale of the road network to a certain extent and into the gradual maturity stage,how to combine the integrated transport system construction and integration of the need for road network to further optimize and improve is particularly important.This paper analyzes the influencing factors of the development of highway network,construct the judgment index system and judgement standard for highway network development;Summarizes the characteristics and layout requirements of "the staggered maturity of highway network";Highway network development scale combination forecast model is established based on grey correlation degree,and combined with the actual needs of highway network grade structure optimization,highway network grade structure multi-objective optimization model is set up;Considering development characteristics of nodes,combines spatial interaction model and theory of economy potential energy to establish the nodal comprehensive superiority degree model,and based on it to divide node level,lays a foundation for the optimization of road network layout;Comprehensive consider the rationality of the road network layout form and the optimality of the road network layout optimization mathematical model,establishes combination optimization model based on the balance of comprehensive superiority degree and the genetic algorithm,and uses spatial connected circle to check network layout form,finally get the highway layout optimization program;The rationality of the research theory in this paper are verified to take optimizing layout of arterial highway network in Shaanxi Province as an example.The nodal comprehensive superiority degree model reflects the influence of the various transportation mode around the node on the development of the node,and it can be calculated and more comprehensive and objective without determining the weight.The combinatorial optimization model of road network layout constructed by the article takes into account the optimization of the mathematical angle and the rationality of the layout of the road network,which can effectively optimize the layout of the road network and meet the requirements of the staggered mature road network,better play full play to scale merit and integral efficiency.