Research On Optimization Technology Of Mountain Highway Route Selection Under Multiple Constraints

For new highways,road selection is very important.Especially for mountainous areas,the construction environment is complex.The rationality of line selection not only directly affects the engineering quantity and engineering cost,but also seriously affects the safety of driving.,comfort,etc.This paper takes the line selection project of Nanchong to Tongnan(Chuanyujie)expressway as the research object.On the basis of analyzing its construction conditions and overall design of the road,it adopts the method of discussion selection and comparison with precision selection.The comparison of the schemes finally selected the recommended route and conducted a comprehensive evaluation study on the selected recommended routes.This paper firstly analyzes the construction conditions of the expressway from Nanchong to Tongnan(Chuanyujie).Starting from the road network conditions in the area,the paper analyzes the natural geographical conditions along the route,the distribution of important facilities along the environmentally sensitive areas along the route,and the distribution of traffic volume.And the impact of land resource status along the route on the highway selection line;secondly,the overall design index of the expressway was studied.Based on the analysis of the characteristics of the expressway along the line,the research object was analyzed from a macroscopic perspective.The connection method of other roads,and the technical standards of the research objects were analyzed.The speed was simulated and the speed was measured and evaluated.Thirdly,based on the analysis of the principle of route layout,the alternatives were selected and discussed.Compared with the selection and the same precision selection method,the optimal route is selected,which is the recommended route of this paper.The overall layout of the recommended route and the main technical indicators are analyzed.Finally,in order to further verify the reasonable route Sexuality,comprehensive evaluation of recommended routes,selection of economic indicators,technology Indicators and social indicators are used as evaluation indicators.The analytic hierarchy process is used to determine the weights of each index.Combined with the matter-element extension theory,the rationality of the recommended route is comprehensively evaluated.The final study concludes that the recommended route is reasonable.The reasonable route selection to the Tongnan(Chuanyujie)expressway provides a certain basis.Based on the expressway from Nanchong to Tongnan(Chuanyujie),this paper demonstrates the application of multiple constraints and various research methods to the selection of mountain highways.The choice of route not only fully considers the construction conditions.And the detailed design and reasonable application of the overall design scheme of the line and the comparison method of multiple alternative lines are carried out,and the analytic hierarchy process and the matter-element extension theory are combined and applied to the comprehensive evaluation of the recommended routes.It has played a positive role in perfecting the theory and method of mountain highway route selection.