Response And Law Of Semi-Rigid Asphalt Pavement Under Activity And Static Load

With the rapid development of road transport, currently vehicles have appeared situations such as speed increased and bearing condition, and due to the pavement roughness, the motion and vibration for vehicles increased.; the force of the vehicles to the road is no longer constant, but the dynamic load. While the phenomena of pavement early failure are increasingly outstanding, many regions have seen the phenomena in "built in this year, bad the next year". Many of these destructive phenomena cannot give a reasonable explanation with the traditional theory in statics. In order to be more scientific in using the asphalt pavement performance, there must be an analysis on dynamic load that response for the asphalt pavement.This thesis is mainly through the Abaqus finite element software to study the response behavior of the semi-rigid asphalt pavement, by the establishment of the contains numerical model from finite and infinite elements boundaries; comparatively analyzes the similarities and differences between under dynamic and static load stress response of semi-rigid asphalt pavement; and provide the guidance in improvement and optimization to the current pavement design method. This thesis mainly analyzes the semi-rigid base asphalt pavement structure under dynamic and static load vertical settlement layer, the layer bottom bending stress, the flexural strain and at the end of the horizontal shear stress response if the structure layer; and analyzes the scope of the index and depth along the road; it also considered the different asphalt pavement surface structure, the different primary modulus, the different axle load and the different driving speed corresponding to the dynamic load on the indicators. The main results are as follows:1, Comparing the response of dynamic and static load, the design of asphalt pavement should take care of the surface layer deflection, the stress of bottom, the tensile strain of bottom of asphalt surface, and the shear stress of asphalt surface;2, Considering the sensitivity, the thickness of the surface of the influence of the change is obvious; The modulus of the change of the index have a major influence; The change of load of asphalt pavement on each index is obvious; Low speed traffic dynamic loads of actual produce bottom stress is bigger, the surface of shear stress level by driving speed has obvious effects;3, Put forward the design for the asphalt pavement dynamic method.