Alignment Design Method of Tunnel Entrance and Exit Transition Section Based on Capacity Stability

Abstract

The invention discloses a linear design method of tunnel passageway transition sections based on traffic capacity stability. The method comprises the following steps: providing a traffic capacity calculation model based on road widths, and calculating reasonable widths corresponding to different regions based on the model so as to avoid single consideration of horizontal and vertical linear design indexes of the tunnel passageway transition sections; on the basis of considering the traffic capacity of a tunnel passageway, by combining influence factors of dynamic driving environment and psychological and physiological characteristics of a driver, designing an optimal transition section line so as to ensure the safe and smooth transition of the driver in the region; and determining optimal design lines of different tunnel passageway transition sections so as to ensure the reasonable utilization of road resources of the tunnel passageway transition sections and improve the accuracy and preciseness of construction standards, thereby improving the driving traffic capacity of the tunnel passageway transition sections. The whole design method is more scientific and comprehensive and can be better fully combined with practical characteristics.

Description

technical field [0001] The invention relates to tunnel design, in particular to a linear design method for a tunnel entrance and exit transition section based on traffic capacity stability. Background technique [0002] With the continuous development of expressway construction in mountainous areas in recent years, due to the complexity of geological conditions in mountainous areas, the tunnel alignment design gradually transitions from flat straight lines to curved lines. At the same time, the tunnel structure alignment has certain particularities. Decreased stability eventually leads to traffic accidents. Therefore, studying the linear design of the transition section of the tunnel entrance and exit can not only improve the stability of the traffic capacity of the transition section of the tunnel entrance and exit, but also has important theoretical significance and practical value for ensuring the safe and smooth passage of drivers. [0003] Through the search, it is fou...

AI Technical Summary

Problems solved by technology

Especially in European and American countries, more attention is paid to the coordination between driver-car-road-environment in the linear design, but the influence mechanism of a single index is not clear enough, and there is a lack of characteristic index and its change law for the system to characterize the smooth transition research, it is difficult to apply in engineering practice

Compared with foreign countries, domestic research started late, and the concept and method of linear design are relatively backward. The linear design of tunnel entrances and exits still stays on the traditional concept of flat and longitudinal curves and reasonable length values. The cross-sectional design is stereotyped, and the bridge It is designed by different designers and units from the tunnel, often ignoring the compliance requirements of the tunnel entrance and exit transition section, lacking a design idea and specification requirements that can reflect the tunnel entrance and exit compliance

[0009] To sum up, among the published patents and published research results at home and abroad, the research on the linear design of the transition section of the tunnel entrance and exit lacks an organic combination with the driver's life, psychological factors and traffic capacity models. The design aspect is only a quantitative index of mechanical fixation, which cannot reflect the design concept of human safety. It lacks the support of relevant research theories and the comprehensiveness of the design. Because the left side of the transition section of the tunnel entrance and exit has high stability and the right side has low stability, The present invention is mainly aimed at the linear design on the right side of the tunnel entrance and exit

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