Discuss And Study On Selection Of Interchange Suitable For The Mountainous Terrain

The construction of mountain highway is more than ten years which is now in the peak period of construction. At this stage , the interchange design of mountainous highway is basically applied to the model of design of the plain interchange, there is no combination of mountainous terrain, geological conditions, and a comprehensive, serious and careful analysis and research. Juding from the domestic view, the interchange design of mountain region is currently no unified technical guidelines and specifications, especially in the selection of interchange program ,which is arbitrary and poor specification,so there are many key issues of selection of interchange program still needed to be further shudied.In this paper, I analyzes the conditions of mountain interchange layout, common type of Mountain Interchange,the mountainous terrain, and study different units in mountainous terrain,which are single-slope terrain, dual slope valley terrain, brook terrain, terraced mountain terrain,and the combination terrain.At the request of the principles for determining the location of mountain interchange,accordding to the the method of influence lines on traffic location theory, in this paper ,I provide a way to determine the choice of interchange location, and then at the requerst of principles of interchange selection requirements establish the mountain interchange selection systems, combined to the factors of mountain interchange program.After the analysis of the commonly used method of selection of Mountain Interchange, and their respective strengths and weaknesses,inthis paper I proposed the method of selection of mountain interchange: fuzzy comprehensive evaluation. On the basis of comprehensive study to evaluate the interchange program and referring to a large number of domestic and international interchange program evaluation,I establish the evaluation index system of mountain interchange ,and interchange evaluation program are defined and analyzed.,at last use fuzzy comprehensive evaluation method to select the interchange program.At last as Bishan interchange from Chengdu-Chongqing second expressway an example, the evaluation system of mountain interchange selection was verified.