沥青路面的雨天行车安全性分析

针对沥青路面的路表轮胎行车滑水，提出了行车的临界水膜厚度概念，利用动量定理进行了临界水膜厚度计算公式推导，计算了不同行车速度下的路表临界水膜厚度，经与国外的极限车速计算经验公式对比，验证了其可靠性，并以降雨的路表水膜厚度为依据，分析了以临界水膜厚度作为道路结构设计控制指标的行车安全性，提出了增加安全性的工程技术改善措施．

Analysis on Safety Performance of Driving on Asphalt Pavement in Rainy Condition

Aiming at the vehicle hydroplaning for driving in rainy days, this paper puts forward the conception of critical thickness of water film, and derivates formula for calculating the critical water thickness on the road surface based on momentum theorem. The values of critical thickness of water film for different driving speeds are given, and it is proved that the formula is reliable by contrasting with the values from foreign experiential formula. Meanwhile, knowledge of hydraulics contributes to the calculation of the water thickness on the road surface, and the design method of asphalt pavement based on the standard of the critical thickness of water film is given by using the surface water thickness. The paper finally gives some engineering methods for developing the safety performance of the asphalt pavement.