| The road of AC+PCC is the most common form of pavement structure in china. The rigidly and flexibly combined structure can guarantee both the strength and a better driving experience. Because of serious overloading in China, pavement diseases occur frequently in the longitudinal section. Therefore, it ’s necessary to do mechanics research of longitudinal slope section and analyze the influence of various factors on the pavement structure. This article continues to carry out an in-depth study of AC+PCC pavement structure based on a lot of literature reading and a large number of research results.Considering the great disparity of design service life and actual service life especially the frequent diseases in the longitudinal section, the finite element analys is software ABAQUS is used in the analyses. 3D modeling is built to simulate the vehicle running on the mechanical model of longitudinal slope section, in which domestic common road structure model is established. Through the software, AC+PCC pavement’s design working condition is analyzed in various environments. Semi-rigid pavement common form of crack is simulated, and the pavement mechanical parameters of corresponding crack are analyzed. The main research contents are as follows:(1) the common distributed load mode is changed, and the load area is divided into different regions, which is more in accord with the actual situation;(2) the variation principles of stress, strain and deflection of asphalt layer on the surface and bottom of the asphalt layer due to the change of slope is analyzed;(3) the variation of the thickness and the modulus of asphalt layer under the action of vertical horizontal force load and vertical load is analyzed;(4) the effect of different axial load on differen t mechanical indexes of asphalt layer is analyzed;(5) the simulation of the asphalt layer and the PCC slab crack model and the equivalent stress and shear stress of asphalt layer under different conditions are analyzed.The results can be concluded that the vertical slope road especially large longitudinal slope road in the most unfavorable position of various stress value will be greater than the level road; large longitudinal slope conditions of AC layer parameters of different mechanical indexes effect rule and the level road is consistent; When Road Surface Cracks in the most unfavorable position crack at the bottom, there is large stress concentration phenomenon; Between in the AC layer and PCC slab added stress absorbing layer of reflection crack occu rrence of obvious inhibitory effect. |
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