Research on Gentle Slope Design Index of Continuous Downhill Slope Section of Mountainous Highway

Abstract

In order to ensure the safe driving of heavy trucks, the mountainous highways have stipulated the average longitudinal slope and slope length of continuous downhill slopes. For the continuous downhill sections, the necessity of gentle slopes exists, and it is proposed to meet the average longitudinal slope conditions. The gentle slope and slope length index have certain guiding significance for the design of the longitudinal section of continuous downhill section controlled by the average longitudinal slope index. In this paper, the relationship between the running speed characteristics of the downhill truck and the slope of the vertical slope and the traffic accident rate are analyzed. The FAW Jiefang J7 tractor CA4250P77K25T1E5 with the total weight of 48.805t and the power quality ratio of 7.58kw/t is selected as the leading model, based on the downhill slope. Reduce the speed, combined with the braking performance curve of the slow-slope section of the dominant model, the research shows the design index of the downhill gentle slope.