基于动量原理的大坡度沥青路面动水压力计算及影响因素分析Calculation and influence factors analysis for hydrodynamic pressure of asphalt pavement with large slope based on momentum theorem

在多雨地区长大纵坡沥青路面是雨天事故多发区域。应用动量定理，建立了沥青路面动水压力的力学计算模型，并系统分析了车辆荷载、行车速度和道路纵坡对动水压力的影响。结果表明，当水膜厚度＜3 mm时，动水压力随车速及车辆荷载的增大而增大，上坡时，动水压力随着纵坡坡度的增大而增大，下坡时，动水压力随着纵坡坡度的增大而减小。当水膜厚度＞3 mm时，动水压力随车速、车辆荷载增大而增大，上坡时，动水压力随着纵坡坡度的增大而增大，下坡时，动水压力随着纵坡坡度的增大呈先缓慢增加然后又缓慢减小的变化趋势；无论是上坡还是下坡，动水压力都随着车轮半径的增大而增大。本研究成果为多雨地区长大纵坡沥青路面重载交通高速行车易发生交通事故提供了理论分析依据。

Calculation and influence factors analysis for hydrodynamic pressure of asphalt pavement with large slope based on momentum theorem

The traffic accidents often occur easily at the asphalt pavement with large longitudinal slope in rainy regions when it rains.In this paper,the mechanics model of hydrodynamic pressure for asphalt pavement is established based on momentum theorem.On this basis,the influence of vehicle speed,vehicle load,and longitudinal slope on hydrodynamic pressure are analyzed systematically.The results showed that:when the thickness of water film is lower than 3 mm,hydrodynamic pressure increases with the increment of speed and vehicular load.At the same time,hydrodynamic pressure increases with the increment of the longitudinal slope in upgrade section and decrease with the increase of longitudinal slope in downgrade section.When the thickness of water film is greater than 3 mm,hydrodynamic pressure increases with the increment of speed and vehicular load.The hydrodynamic pressure increases with the increment of the longitudinal slope in upgrade section,but it will first slowly increase and then slowly decrease with the increase of the longitudinal slope in downgrade section.The hydrodynamic pressure increases with the increment of tire radius whether upgrade or downgrade section.This paper provides the theoretic basis of the reason that traffic accidents occur easily in the asphalt pavement with the large longitudinal slope in the rainy region when the vehicle speed is high.