Dynamic response analysis of asphalt pavement with semi-rigid base based on MLS66 accelerated loading test

To study the variation rule of mechanical response of the semi-rigid base asphalt pavement structure, MLS66 accelerated loading equipment was used to test the pavement under different pavement temperature fields and loading speeds. Results show that the influence of the location of the measuring point on the transverse strain of the surface layer bottom is the most significant, and the influence on the longitudinal strain is relatively weak. The most unfavorable load position of both is the center of the double wheel, and the vertical strain is least affected by the location of the measuring point. The most unfavorable load point at the base and bottom of the base layer is also in the center of the double wheel. The three-way strain amplitude of the surface layer bottom is correlated with the positive index of temperature, and the vertical compressive strain is the most obvious. The strain increases by 59.4 x 10 ~6 with the temperature increasing by 1 °C. The strain amplitudes of base and bottom base layers are less affected by temperature. The decrease of loading speed leads to the increase of longitudinal and vertical strain amplitudes and acting time at the bottom of the surface layer. When the speed decreases from 22 km/h to 10 km/h, the acting time increases by 110% and 67. 6%, respectively, which will cause fatigue cracking and compacted rutting of the surface layer. For intersections and sections with frequent stops, attention should be paid to the optimization design of the layer. © 2023 Southeast University. All rights reserved.