Abstract: Based on repeatedly dynamic triaxial test result fitting, using the Kenlayer computational procedure and the 1stopt statistical analysis software, the nonlinear regression and fitting were carried out. One permanent deformation computational method of flexible pavement graded gravel base under the vehicles axle load repeatedly function was established. A scene correction coefficient was introduced to modify the indoor permanent deformation estimate model. The permanent deformation of flexible pavement graded gravel base may be directly calculated through the regression formula proposed in this article. And it can be used to forecast Chinese asphalt pavement rutting.

Key words: flexible pavement； graded gravel base, permanent deformation； regression fitting