雨天道路表面薄层水流特性的影响因素分析

Analysis of the Influence Factors on the Characteristics of Thin Layer Flow on the Road Surface

道路表面水流受坡长、坡度、路表粗糙度、降雨强度等因素影响,薄层坡面水流流场比较复杂,很难用数学计算反映各因素之间的关系。文中利用FLUENT软件,采用水气两相流中的DPM方法,结合EWF模型模拟道路表面薄层水流情况,探究路表水膜厚度在不同水力特性参数下的变化规律。分析发现,坡长、横坡度、降雨强度对路表最大积水厚度影响明显,纵坡和路表构造深度与路表最大积水厚度相关性不大。

Slope length,slope,road surface roughness,rainfall intensity and other factors affect the road surface water flow.Because of the complexity of the flow field on the slope,it is difficult to use mathematical calculation to reflect the relationship among the factors.The FLUENT software is used to simulate the flow of thin layer on the road surface with the DPM method in the gas water two-phase flow,and the EWF model is used to investigate the variation law of the surface water film thickness under different hydraulic parameters.The results show that the slope length,slope gradient and rainfall intensity have a significant effect on the maximum thickness of the water table,and there is no significant correlation between the longitudinal slope,the depth of the road surface and the maximum water depth.