Research On The Key Technologies Of Route Development Interchange

Special type interchange on the mountain roads is a rather complicated and complete system, in addition to conventional interchange are all at the scope of special type interchange. Route development interchange is one of the special type interchange. It is the interchange form which can overcome tremendous height difference△h, through reducing the gradient to complete the transport function. Special type Interchange refers to the special interchange in addition to conventional forms of Interchange.On the basic of studying the selective technology and design techniques of route development interchange, the paper establishes a new evaluation index system.The index system basically summarizes the need of traffic safety, transport function, economic efficiency, environmental impact, route development function and so on. The methods to calculating the indexes are also presented.Based on the features of the special type interchange and the route development interchange, this article preliminarily explores the classification of the route development interchange and proposes its initial type. And it deeply studies the key technologies and the impact on the route development interchange.The program evaluation of route development interchange is a foundational work during designing, is also a important link between different design stage.Interchange design is good or bad, the key is that the program selection is reasonable or not. This paper applies a combination weighting based on improved analytic hierarchy process(AHP) and entropy value method.For the disadvantage of 1～9 scale in existing AHP, this paper proposes an improved AHP based on the scale of e 0/5~8/5. It utilizes entropy value method as objective weighting, then combines subjective weights and objective weights through linear weighted method.This paper analyses several comprehensive evaluation methods commonly used, AHP,Fuzzy Comprehensive Evaluation(FCE)and Grey Relational Analysis(GRA)and so on. It points out the characteristics of interchange schemes evaluation, quantitative and qualitative combined, fuzziness and grey coexist; then a new comprehensive evaluation method combined FCE and GRA is proposed.At last, the Su Jiaba interchange is given to test the feasibility and applicability of the theory.