City fast road intercommunicated overpass simulation design system and selection method

Abstract

The invention discloses a simulating design system for city expressway interchanges, comprising: data acquisition, model calibration, a data-out module, an evaluation and analysis module connecting with the model calibration module and data-out module respectively, and a data amendment module connecting between the evaluation and analysis module and the model calibration module. Meanwhile a model building and design method using the design system is disclosed too, which comprises: collecting the characteristic parameter of the traffic flow of typical expressway basic sections, interchange triage / confluence area, cutting area and various ramps; building the corresponding database and traffic capacity theoretical analysis model; demarcating and amending speed and density model with determinate service level; building traffic capacity analysis model suiting the traffic flow characteristic of the city expressway interchange. At last, the design of the lectotype of the city expressway interchanges conducted by the design model comprises analyzing and forecasting the traffic, raising a preliminary scheme, calculating the traffic capacity of the interchange, analyzing the suitability, selecting a rational strategy.

Description

technical field [0001] The invention relates to an interchange planning and design system, in particular to a simulation design system and an interchange type selection method for urban expressway interchanges. Background technique [0002] Urban expressway (urban expressway) is built to meet the needs of large-capacity, long-distance, and rapid traffic in the city. It is a road system with a continuous divider in the middle, fully enclosed, fully interchanged, and fully or partially controlled access. Expressways provide vehicles with the function of fast, safe and comfortable traffic travel between various areas of the city. The hub-type interchange is an important traffic node in the expressway system, and it is the key to determine whether the expressway can exert its maximum function. Therefore, the scientific rationality of the scale and form of hub interchanges is very important. [0003] At present, due to the rapid development of social economy, the extension of u...

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Problems solved by technology

[0006] 2) In the design stage of the interchange, there is no scientific basis for the calculation method of the traffic capacity, and there is no scientific evaluation method for the adaptability of the interchange to predict the traffic volume in the future

[0009] 3) Domestic expressway and urban road intersection design regulations are being compiled, and the design of expressway interchanges lacks normative guidance

In the process of use, it is found that some indicators of domestic norms are not suitable for the design of expressway interchanges. The main manifestations are: the indicators of "Highway Route Design Specifications" are too high, and urban expressway interchanges cannot meet its requirements due to urban land use restrictions; " Relevant indicators such as "Code for Urban Road Design" are correspondingly too low. Expressway interchanges must meet the high-speed separation / merging and interweaving of vehicles. It is obviously inappropriate to refer to the above specifications and standards.

Moreover, the specification does not provide the analysis and calculation method of the traffic capacity of the interchange and the service level index system, and the foreign reference materials do not conform to the specific conditions of my country. Therefore, how to improve the analysis and calculation method of the traffic capacity of the interchange and the service level index system guide the expressway The planning and design of the

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