Study on Dynamic Response of Saturated Asphalt Pavement Under Multi Factor Interaction

In order to solve the water damage phenomenon of asphalt pavement in humid, hot and rainy areas, the mechanism of dynamic water pressure on asphalt pavement was studied. Firstly, a model of the relationship between frequency, air void, permeability coefficient and modulus were established according to the measured asphalt mixture parameters. Then, according to the model, the parameter values of asphalt mixture multi parameter interaction are estimated. Based on this, combined with Biot’s consolidation theory, the finite element software was used to simulate the dynamic response results of pavement structure with and without considering the change of parameter linkage. At the same time, the law of the effect of air void and driving speed on hydrodynamic pressure under the action of multi-parameter linkage was studied. The results show that the pore water pressure of the pavement structure is overestimated by 329.68 kPa, the vertical stress is underestimated by 91.43 kPa, and the shear stress is overestimated by 24.79kPa without considering the multi-parameter linkage change; The pore water pressure of pavement surface is the largest, and the pavement surface is the most unfavorable position where water damage occurs; The research is of great significance for accurately evaluating the water damage resistance of asphalt pavement