Study on Development Law of Rutting Based on Long-Term Detecting Data

This study aims at investigating the long-term development law of asphalt pavement rutting. The data of typical cross-sections were extracted and optimized from Long-Term Pavement Performance (LTPP) database. Rutting depth, filling area, positive area, and negative area were adopted as indicators to evaluate pavement rutting. Then the changing trend of rutting was further analyzed under different temperatures and loading conditions, thus determining the development law of rutting with the increase of pavement service life. It was found that most rutted cross-sections gradually became type Ⅲ and type Ⅳ cross-sections after long-term changes. The development trends of rutting depth were consistent with the filling area, which showed several phases, including rapid development period and relatively stable period. The segments with increasing rate of rutting depth greater than 1.5 mm/year and increasing rate of filling area up to 1,200 mm²/year were in rapid development period, in which appropriate preventive maintenance needs to be taken.