Theoretical Study on Effect of Axle Weight and Tyre Pressure on Dynamic Response of Semi-rigid Base Asphalt Pavement

A dynamic model for calculating the dynamic response of multi-layer visco-elastic system under moving load was set up, and the influences of axle load and tire pressure on the dynamic response of the semi-rigid base asphalt pavement were analyzed based on multiobjective evaluation parameter.i¤The results show that (1) dynamic response increases with the increasing of axle load and tire pressure; (2) under0i¤7MPa tire pressure a250 kN axle load, the maximum strains of the semi-rigid pavement, which include the horizontal tensile strain at the bottom of the AC layer and the vertical compressive strain at the top of the roadbed, are still lower than the corresponding design limitation for the long-life pavement; (3) the horizontal shearing strain at the bottom of the AC layer is several times larger than the horizontal tensile strain.So the horizontal shearing strainat the bottom of the AC layer should be taken as a main design control index for the semi-rigid asphalt pavement, and the horizontal tensile strain at the bottom of the AC layer and the vertical compressive strain at the top of the roadbed should be taken as checking indexesi¤Increasing the coherence strength between the base layer and the AC layer is the key technique to increase the service life of the asphalt pavementi¤