Abstract：When the aircraft is turning on the ground, the turning area of airport composite pavement will bear the vertical force and lateral thrust that are coupled with the slow speed, long action time and high temperature weather conditions, so rutting damage is prone to be caused and the safety of aircraft ground operations will threatened. By analyzing the action number of turning moving load, the turning moving load is turned into cyclic load wave with the principle of equivalent deformation based on the three-dimensional finite element model of composite pavement. The finite element model for rutting analysis of composite pavement turning area is established considering the environmental temperature conditions in Kunming area to analyze the rutting deformation influence laws of temperature, turning speed, overlay thickness and tire pressure. It is found that the temperature influences the rutting development much. When the temperature is 20℃ to 30℃, the rutting deformation is very small with the largest value 3.05mm. When the temperature is 40℃ and 50℃, the rutting amount is 14.5mm and 22.74mm, respectively. With the increase of turning speed, the depth of rutting decreases gradually. The depth of rutting decreases by 23% when the speed is low. But the composite rutting depth (CRD) increases with the speed, and the CRD value is 8 times that of low speed when the speed is excessive, which indicates that the influence of the horizontal thrust on the rutting deformation is enhanced. The depth of the rutting increases first and then decreases with the thickness of overlay, while the CRD decreases slightly with the increase of the overlay thickness. When the thickness of the overlay increases from 10cm to 20cm, the CRD value decreases only 0.03. The depth of rutting varies linearly with the tire pressure. Further considering the temperature, velocity, overlay thickness and tire pressure correction coefficient, the rutting development equation of the composite pavement turning area is proposed.
