公路纵坡坡度和坡长限制指标的确定

The Study of Highway Gradient and Grade Length Limit

针对我国的主流货运车型与载重吨位,根据实车装载上坡试验,研究车辆在上坡行驶时,纵坡坡度与车辆行驶速度以及速度随坡长的变化规律,确定典型货车在不同坡度下的上坡性能曲线;通过速度折减量与坡长之间的关系曲线,提出基于运行速度差和满足公路服务水平要求的各级公路最大纵坡坡度与坡长限制值。

This paper focuses on the highway gradient and grade length limit by researching truck's dynamic performance in upgrade climbing.With roadtest,statistics and theoretic analysis,based on typical truck and load,the paper studies the regularity of acceleration and deceleration in different gradient.By analyzing the relationship between speed loss,speed discount in different gradient and grade length,the paper also brings forward the maximum longitudinal gradient and grade length limit.