Design method of high-speed ring road cross section line shape

Abstract

The invention provides a design method of a high-speed ring road cross section line shape by determining the actual width of a lane to calculate and deduce a high-speed ring road circular curve and across section line shape of a easement curve section of a road, solve an accurate cross-section of the high-speed ring road, and provide a basis for reasonable optimization of the cross-section, thereby effectively reducing subgrade filling height and earthwork filling and digging amount, and reducing the number of special-shaped plates on a cement concrete pavement. The design method of the high-speed ring road cross section line shape effectively solves a problem of changes in horizontal width of the easement curve section of the road and improves design rationality. The design method comprises the following steps: by introducing a Gaussian elimination method, calculating a cross-section parabola line shape; determining lane chord length on the cross section corresponding to horizontal width of the lane; and using the interval dichotomy to iterate repeatedly to make a target lane chord length approach a design value, and obtaining final lane horizontal width and filling height to determine the final line shape of the cross section.

Description

technical field [0001] The invention relates to the technical field of geometric design of high-speed ring roads in automobile proving grounds, in particular to a geometric design method mainly used for the cross-sectional alignment of curved road sections of high-speed ring roads. Background technique [0002] As the main facility of the automobile proving ground, the high-speed ring road generally requires a special geometric design method to provide effective, safe and relatively comfortable operating conditions for continuous high-speed driving tests on a relatively limited site. Its horizontal curve radius, transverse superelevation and other technical index requirements have far exceeded the limitations of expressway geometric design technical standards. On the other hand, the curved part of the high-speed ring road is completely different from the general road, and the geometric characteristics of the three-dimensional surface of the space have a great influence on th...

AI Technical Summary

Problems solved by technology

[0004] The existing cross-section alignment design has limitations and deficiencies in the design and calculation methods, mainly reflected in the fact that the horizontal width of the lane is often used for calculation in the design. When the cross slope of the road is small (low-speed lane), the horizontal width of the lane can be approximately equal to the The actual width, but when the cross slope of the road is large (high-speed lane), the actual width of the lane can reach 1.2 to 1.5 times the horizontal width, and the height of the roadbed will increase, which will significantly increase the amount of earthwork on the roadbed and the energy consumption of vehicles

In addition, when cement concrete pavement is used, the traditional design method will also produce a large number of special-shaped concrete plates, which will increase the difficulty of construction

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