Study On Optimal Design And Adjustment Strategy Of Highway Network

Highway is an important infrastructure of country. The reasonable road network can embody the coordination, integration and sustainability of regional socio-economic programs, promote land development, guide industrial layout, and promote regional development by the "growth-oriented" to "planning-oriented" shifts. The above aspects are of great significance. Base on the research about network optimization layout theory, this paper employs the traffic theory,optimization theory and decision theory et al to study the analysis method of optimal design and adjustment strategy of highway network. We try to find the approach which makes regional traffic in coordination with regional economic development and make highway meet the growing traffic demand, as to establish the basis for construction of regional highway network with strong adaptability.Firstly, the thesis reviews the concept and the present study condition of the highway network. We divide the papers as six branches—traffic network balance problem, discrete network design, continuous network design, hybrid network design and network capacity expansion theory. And then we introduce the methods of the traffic network design. On the basic, the idea and method of freeway traffic volume prediction are introduced.Secondly, a model for node classification which based on preference disaggregate is proposed to obtain the importance degree of network nodes. Through establishing the Comprehensive Evaluation System, an approach for highway Scheduling based on evidence theory is proposed.Thirdly, with the increasing traffic demand, the service level of old roads will decrease and the equilibrium will be broken, so the old roads need broaden. Based on the forecasting of traffic demand, two distinct approaches are put forward to determine the adjustment strategy for highways which include determine the number of roadways, the time and the sections need broaden.Fourthly, the transportation hub layout is one of important part of road network layout. Using uncertainty theory, we study the transportation hub layout problem and freight station location problem under uncertain circumstance. Finally, based on the above theory and method and the data, the Henan section of Jing-Gang-Ao highway expansion problem is analyzed and corresponding adjustment strategies are put forward.