柔性路面的永久变形直接影响到路面平整度和使用寿命。在现代渠化交通的高速公路和干线道路中,控制路面的永久变形和避免车辙破坏就越来越显得重要了。二十多年来,各国对柔性路面的永久变形进行了大量 Permanent deformation of flexible pavement directly affects the road surface roughness and service life. It is more and more important to control the permanent deformation of the pavement and avoid the rutting damage in the expressway and trunk road of modernized traffic. For more than two decades, various countries have done a great deal of permanent deformation of flexible pavements