Study On The Planning Of Road Network

In this paper, based on home and abroad research works, the combination of qualitative analysis and quantitative analysis was chosen and the network's scope, layout, evaluation of Road Network Planning (RNP) were analyzed and investigated by the guidance of systematic engineering idea.Firstly, the foundation and the significance of this research in this paper were introduced and the current situations of the network's scope, layout and evaluation were summarized. Meanwhile, the purpose and the content of this study were brought forth.Secondly, the problems appeared in the present road network's scope and grade structure optimization model were summarized and analyzed. A forecasting model was put forward in this paper on the basis of System Dynamics and B-P Neural Networks. The grade structure model with multi-objectives was founded by predictive results of the forecasting model, which was applied to Dalian's grade structure of the road's network.Thirdly, the node hierarchy division method was analyzed by the qualitative and quantitative analysis. After the nodes' population, GDP, freight volume, passenger transport volume were considered, the nodes in Dalian city were divided into 3 parts by fuzzy clustering analysis method: important nodes, inferior important nodes and ordinary nodes.Fourthly, the two-stage and bi-level planning model that is composed of long-term model and short-term model was established based on the present results. The Genetic Algorithm was employed to solve the model and the example study was applied to Dalian's road's network.Fifthly, WPDEA model for evaluating the relationship between road construction and social economy was built in view of some disadvantages of DEA model. The harmony between road's network and the economy at different periods was calculated and the implement process of WPDEA model was evaluated. Finally, the main conclusions were obtained and a prospect for further studies was shown clearly.