The Study On Selection And Location Of Interchange In Mountainous Expressway

The design of mountainous highway interchange involves many sides and has an integral nature;it is therefore a difficult job.Although domestic and foreign interchanges have been developed for decades,the design theory of interchanges also has been established and developed gradually,it is immature and incomplete,and still greatly lags behind the theory of highway route design.Mountainous areas have characteristics of complex terrain,big ground elevation difference,frequent change,steep natural slope,widely distributed unfavorable geology and special geotechnical layer,complex type selection of interchange.So it is very necessary and urgent to continue developing design theory of mountainous highway interchange.The paper mainly studies the layout and type selection of mountainous highway interchange,which is the core content of interchange design.This paper intends to limit the conditions before the collation and analysis of mountain interchange selection,introduces the characteristics of mountainous highway interchange;then combined with the characteristics of high speed communication interchange area,from interchange in the road network traffic prediction function,basic principle,traffic safety,terrain compliance,people-oriented and other aspects of mountainous highway interchange location selection then summarized;mountainous highway interchange type selection and selection steps and ideas than argument;finally,this paper takes Yunnan Zhaotong to Sichuan Leshan Expressway on silk to Buddha rock section is the actual project,the project is the starting point to string wire hub interchange and the chestnut Ping interchange(cooperation with the parking area)as an example and the study from the forecast of traffic volume and type of interchange,the primary economic and technical comparison demonstration,further analysis and The methods and ideas of the selection and comparison of the schemes for high speed interchange in mountainous areas.Through the study of this paper,we hope that we can further expand the theory of design and selection of interchange of mountainous expressway,which will play a guiding role for the future design work.