The Effect Of Heavy The Three Wei Luji Road Structure Dynamic Characteristics Studied

Asphalt pavement is one of the primary structures for main roads in China. The increasing overloaded and heavy-loaded traffic in recent years is causing more and more early damage to asphalt pavement. Heavy-loaded traffic has become one of the key factors to endanger the pavement, on the other hand, during the vehicles running on the road vibration is caused by vehicles because of roughness, the force applied to the pavement is a typical dynamic load, but the current design method of pavement and subgrade uses a mechanical model of elastic multiplayer system under the vertical static load yet, the result is that the dynamic characteristics of the pavement and subgrade can not be explained by using the static theory.Based on the results of existing studies and typical structure of pavement and subgrade, dynamic response of pavement and subgrade under heavy-load is analyzed by using the three-dimensional finite-element method in conjunction with ANSYS software. The distributive law of stress, deformation and displacement in asphalt pavement and subgrade is obtained under the different load and velocity of the vehicle and the different roughness. Under the heavy-load distribution stress in the pavement and subgrade is more non-uniform and the stress concentration is more evident; with the load and the roughness increment, the stress and the deflection in pavement and subgrade increase evidently; the velocity of the vehicles has a little influence on the stress and the deflection in pavement and subgrade but rather significantly on the amplitude of fluctuating stress and deflection; the load is the major factor among load, velocity and roughness. The results can provide reference for asphalt pavement structure design and research.