Construction Scheme Alternative And Simulation Involved Freeway Extension

With the rapid growth of China’s economy, the highway network borne traffic demand rising rapidly, however, a large number of technical standards for the early construction of two-way four-lane highway is low, as a constraint to the highway network serving the major economic and social bottlenecks. However, the renovation and expansion of the existing highway, regardless of the use of the construction program, is bound to interfere with the existing freeway traffic flow, reducing its capacity and service level, which led to a substantial decline from the point and the surface transport network carrying capacity. Therefore, the construction program for the impact angle of the traffic running on the relevance of the construction program and the traffic flow is calculated analysis, study of the construction program based on the analysis, and on this basis, the dynamic multi-index comparison method, combined construction simulation software programs are necessary and have a comparison.In this study, the current construction program of renovation and expansion of correlation analysis results of scholars, based on the first traffic flow highway expansion in the construction area were analyzed from traffic composition, speed distribution, starting from the front isochronous expand construction program analysis and comparison means, a clear follow-up construction design and simulation comparison of the basic theory. Next, select the relevant parameters of the construction program and traffic flow, the use of qualitative and quantitative methods for the analysis of both the degree of correlation, reduce operational impacts from construction scheme on traffic flow point of view, Highways and key points of change expansion of the construction program has been designed, and G72 Quanzhou to Nanning highway four-lane two-way eight-lane change project based engineering, construction program presented in different stages of construction. On this basis, for the renovation and expansion of the highway construction program to build more dynamic evaluation index system, select the appropriate evaluation, the use of multi-index comprehensive evaluation method, evaluation studies were conducted from the perspective of theory and practice. Finally, under the VISSIM simulation environment, establish road model, calibration key parameters for pavement and roadbed construction program in the feasibility and effectiveness of multi-index evaluation parameters were evaluated and verified, compared to select a minimal impact on the traffic flow in the construction program, relying realized construction design, than the practical application of the election.