长大纵坡路段沥青路面车辙规律及影响因素

Rutting law and its influence factors for asphalt pavement in long and steep longitudinal slope section

长大纵坡路段由于特殊的纵坡条件,车辙病害很严重,极大影响了行车安全。基于长大纵坡路段车辙病害的实地调查,分析了车辙沿纵向、横向和深度方向的分布规律,研究了慢速交通对路面车辙病害的影响。研究结果表明:长大纵坡路段沥青路面车辙横向和深度方向的分布规律与常规沥青路面一致;但同一坡度下,车辙深度由坡底至坡顶逐渐增大,坡度越大、坡长越长、车辆行驶速度越低,路面车辙深度就越大;对于沥青混合料这种粘弹性材料,车辆低速行驶相当于增加了荷载作用时间,从而导致车辙迅速增加。

Rutting is worse in long and steep slope sections because of special longitudinal slope,which has a strong effect on traffic safety.Combined with the field survey about the rut disease of two long and steep longitudinal slope sections of asphalt pavement,the distributions of the longitudinal,transverse and depth rut are analyzed,and the influence factors,such as slope ratio,slope length and slow traffic,are also researched.It is indicated that the longitudinal and depth distributions of rutting for asphalt pavement in long and steep longitudinal slope sections are similar to the ordinal asphalt pavement.For the same slope ratio,the rutting depth increases from the slope bottom to top gradually.When the slope ratio and length are bigger,the vehicle speed is slower,and the rutting depth of asphalt pavement is bigger.The slow traffic is equal to the increase of loading time,and it is the main cause for rut rapid development on asphalt pavement in long and steep longitudinal slope sections.3 tabs,7 figs,8 refs.