沥青坡面水流特性影响因素敏感性分析

Sensitivity Analysis of Influencing Factors of Flow Characteristics on Asphalt Slope

为阐明城市沥青道路坡面积水分布影响机理,采用二维浅水方程模拟分析沥青坡面降雨径流特性,基于全局综合敏感性分析的正交试验法,对引起沥青坡面不同程度积水的多重影响因素(坡面横坡、纵坡、坡面宽度、坡长、降雨强度及糙率系数)进行综合敏感性分析。以最大径流深度为敏感性分析指标,同时进行极差分析和方差分析,不仅给出了各影响因素敏感性排序,且明确了各影响因素的显著性水平。研究结果表明,漫流排水条件下,横坡、坡面宽度及降雨强度对坡面径流深度影响均较显著;坡长对坡面径流深度影响不显著;坡面径流深度与横坡均呈负相关关系,与降雨强度、坡宽、坡长呈正相关关系,与糙率系数呈先负后正的相关关系。研究成果可为工程实践提供参考。

In order to illustrate the influence mechanism of flow distribution on slope of urban asphalt road, two-dimensional shallow water equations were applied to simulate runoff characteristics on asphalt slope. Comprehensive sensitivity analysis was performed on multiple factors(cross slope, longitudinal slope, slope width, slope length, rainfall intensity and roughness coefficient) which caused different degrees of ponding on asphalt slope. The maximum flow depth was taken as the sensitivity analysis index. Both range and variance analysis were performed, through which the sensitivity ranking of the influencing factors were obtained and the significance level can be clarified as well. The results show that under overflow drainage condition, cross slope, pavement width and rainfall intensity have significant effects on flow depth;Slope length has no significant effect on flow depth. Flow depth is negatively correlated with cross slope, and positively correlated with rainfall intensity, pavement width and slope length, and negatively correlated first and then positively correlated with the roughness coefficient. The research results can provide reference for engineering practice.