Poor drainage on the road surface will affect the stability of the roadbed and endanger the road safety. In the geometric design of the highway, due to the existence of additional slope, the problem of water accumulation in the ultra-high mitigation section is more serious. The flat-panel combination design should be considered comprehensively. In order to study the optimal slope combination design of different ultra-high mitigation sections, by introducing the Saint-Venan equation and the Manning formula in fluid mechanics. The finite element method is used to analyze the runoff transfer characteristics and runoff depth between road grid elements. A model of ultra-high mitigation water depth distribution was constructed. The continuity experiment was designed and analyzed with variables such as road longitudinal slope, super high cross slope, section length and rainfall intensity. According to the model, the distribution of the depth of the water in the ultra-high mitigation section is determined under different combinations, and the optimal slope combination design is obtained. T The results show that the design of the cross slope has a greater impact on the road surface water accumulation, the road longitudinal slope is 0.3%~0.5%, and the ultra-high cross slope value range is 2%~4%, which is beneficial to the drainage of the road.

CICTP