Non-linear Simulation Analysis Of Interface Bonding Properties Of Asphalt Pavement

At present,there are few indicators on the inter-layer shear stress between the performance of our country and the world in many countries of the design specifications or manuals of the mechanics involved,but from past experience and the actual situation of the road,the road structure under the horizontal and vertical combined effect of vehicle load,especially under heavy load,shear stress between layers can not be ignored.Based on the visco-elasticity theory and finite element method,with SF as an indicator of quantitative analysis of surface shear stress between layers of the mutation,interfacial shear stress Of semi- rigid asphalt pavement under vehicle load were studied in this paper.By dint of large common finite element software ABAQUS, 3D simulating analysis were done including interfacial shear stress under vehicle load at visco-elastic state,in which a comparative analysis including the change on shear stress between static and dynamic load condition of pavement,various contact state between different layers,load size surface modulus and thickness of surface layer was done. Consequently,a quantitative study of surface-based weak link between the surface layers for the effects of shear was made.Finally,by setting up a model with three different asphalt mixtures as a surface layer respectively,and assuming that the transition of three to nine-storey structure of the road as a model,the distribution of interfacial shear under traffic conditions at different temperatures and load sizes were calculated.To apply transition method of calculating this article,some useful conclusions can be draw:There are mutations of shear stress where discontinuous contact state between layers exists,with the inter-layer bonding capabilities bettering,the scope of this mutation will reduce.Vertical and horizontal loads in common under the road surface in the maximum shear stress load the edges,this value is subject to the thickness and modulus of layers.With the modulus increasing and the thickness reducing,the Maximum of shear stress will be increased.In addition,the thickness and modulus of surface layer contribute little effect when they are the same or very similar.The existence of weak links directly changes the base surface and the directions of traffic along the direction of shear distribution,as a result of the fact that weak link can not afford basic shear,the weak links to the surrounding shear will transfer,and then the maximum scope of shear stress will decrease,at the same time whose value there is a substantial growth.