Abstract:The influence of different rutting depth on asphalt pavement structure performance was researched theoretically. By means of mechanical model and numerical simulation, the effect mechanism of vehicle impact load and thickness of asphalt layer on the internal mechanical response and performance degradation of pavement structure was analyzed respectively under different rutting depth. Results show that: when the rutting depth is in the range of 0~10mm, the change of rutting depth has great influence on the impact load response of pavement structure, the effect of impact load is sensitive to the change of rutting depth, and the fatigue life of subbase course decreases rapidly; When the rutting depth is in the range of 0~5mm, the impact load effect is the most obvious, bending and tensile failure is prone to occur in the bottom of base course. Besides, the deformation and tensile stress in the local range of load are much larger than those far away from the load area, and they decrease sharply with the increase of the distance from the loading surface. Therefore, the development of early rutting of asphalt pavement should be controlled and preventive maintenance measures such as overlay should be taken in time. From the perspective of avoiding bending and tensile failure at the bottom of base course, the early rutting maintenance depth should be controlled within 5 mm; from the perspective of maintaining the fatigue life of the subbase, the early rutting maintenance depth should be controlled within 10 mm.
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