水利水电技术（中英文）2025，Vol.56Issue(9)：76-94,19.DOI:10.13928/j.cnki.wrahe.2025.09.006
城市道路洪涝条件下足尺车辆失稳风险阈值试验研究
Experimental study on the instability risk threshold of foot-size vehicles under urban road flooding conditions
摘要
Abstract
[Objective]Under the background of rapid urbanization,the frequent occurrence of extreme weather events has led to the intensification of urban road flooding,which has led to vehicle instability,brake failure and other traffic safety problems that are becoming more and more prominent.The study of vehicle instability risk thresholds in flooded water is of great theoretical val-ue and practical significance in the field of flood risk assessment and emergency management.[Methods]The friction coefficients of new and old wheels under different road conditions(dry,wet,and waterlogged)and different loads were investigated experi-mentally.Taking the Volkswagen Polo as the research object,the rotary bearing and three-axis attitude sensor were used to adjust the direction of the vehicle to meet the flow,and the mechanical sensors and data collector were used to measure the force of the water flow on the vehicle under different water depths and flow rates,so as to reveal the mechanism of the vehicle's destabiliza-tion.[Results]The results show that the coefficient of friction μranges from 0.320 to 0.898,the coefficient of friction of asphalt pavement with the same wheels is larger than that of cement pavement,and the condition of coefficient of friction under the same pavement condition is as follows:wet condition＞dry condition＞waterlogged condition,and the coefficient of friction of the new tires is generally larger than that of the old tires.For non-sealed vehicles,when the water depth is greater than 0.45 m,the buoy-ancy of the car gradually decreases until it sinks to the bottom,and under the same water depth conditions,the buoyancy shows a decreasing trend with the increase of flow velocity.The flow resistance FD and transverse force Fr of the car increased with the increase of flow velocity and water depth,and the coefficient of flow resistance CD of the car in different flow directions(0°～180°)ranged from 0.466 to 1.067,and the coefficient of transverse force Cr ranged from 0 to 0.407.[Conclusion]The car is most easily destabilized at 90° in the head-on direction and most difficult to destabilize at 0°.Adopting the bottom line thinking,the friction coefficient is taken as 0.320,and when the product of flow velocity and water depth hvmin is greater than 0.81 m2·s-1,the car slides and destabilizes.And fitted curves for the relationship between the critical flow rate threshold for instability and water depth for different headwater directions.The results of the study can provide key parameter support for the development of vehicle instability early warning system,and at the same time,provide scientific basis for the optimization of urban road drain-age performance evaluation standard.关键词
城市洪涝/车辆失稳/风险阈值/摩擦系数/绕流阻力系数/横向力系数/气候变化/风险评估Key words
urban flooding/vehicle instability/risk threshold/friction coefficient/coefficient of resistance to flow bypass/coeffi-cient of lateral force/climate change/risk assessment分类
资源环境引用本文复制引用
汪辉,李俊奇,王文海,李小静,郭俊杰,高丽军..城市道路洪涝条件下足尺车辆失稳风险阈值试验研究[J].水利水电技术（中英文）,2025,56(9):76-94,19.基金项目
国家自然科学基金项目(52370093) （52370093）
