基于法国规范的道路平面停车视距计算及研究

平面停车视距作为一项重要的平面设计指标,在法国标准下体现得更加复杂,设计精准度要求高,设计时容易忽略。为探究法国标准下道路平面停车视距的一般规律,消除设计时的易错点,文中以喀麦隆雅温得至杜阿拉高速公路项目为依托,采用法国规范中平面视距的计算方法,计算典型段落的停车视距真实值,并与法国规范的要求值进行对比分析,提出设计参考及建议。结果表明,平曲线半径R及行驶车辆观察点与曲线内侧遮挡物的距离e1、被观察点与曲线内侧遮挡物的距离e2,是影响平面视距的主要因素,设计时应严格控制。

Calculation and Research of Road Plane Parking Visual Distance Based on French Standards

As an important plane design index,the plane stopping sight distance is more complicated under the French standard,and it is easy to be neglected in design because of its high design accuracy.In order to explore the general law of the horizontal stopping sight distance of the road under the French standard and to eliminate the mistakes in the design,this paper,based on the project of Yaoundé-douala highway in Cameroon,the calculation method of the horizontal sight distance in the French standard is adopted.The actual values of stopping sight distance for typical sections are calculated and compared with the values required by the French code.The results show that the radius R of the plane curve,the distance e1 between the observation point of the vehicle and the inside of the curve,and the distance e2 between the observed point and the inside of the curve are the main factors affecting the plane sight distance,which should be strictly controlled in the design.