Typical asphalt pavement dynamic response simulation at the action of dynamic load with multi-steps loading method

Abstract

The dynamic response of a typical pavement subjected to a dynamic load is important. Dynamic moduli of asphalt mixtures, cement treated crushed stone and lime treated soil are tested in the lab. The finite element model is established based on the dynamic modulus. The dynamic load is applied to the pavement structure by the loading steps method and then the pavement response is calculated. The pavement structure model was built in the lab and pavement structure responses are tested under the action of dynamic load which was applied by large size MTS. Compared with the results in the lab, simulation results are verified. By analysis of the simulation results show that: the tensile strain at the bottom of the surface and base under the action of the dynamic load is obviously smaller than the strain under the action of static load, deflection also follows that. In some special cases, the tensile strain at the bottom of the surface and base under the action of the dynamic load may exceed that under the action of static load.