关键词: 道路工程, 有限元, 半刚性基层沥青路面, 弯沉盆, 几何特性, 结构强度

Abstract: To analyze the deflection basin curve characteristics of semi-rigid base asphalt pavement under FWD load, a dynamic finite element model was established. By changing the modulus and thickness of the structural layer, the influence of geometric parameter index and strength change of each structural layer on the curve of deflection basin was analyzed. The results show that the area index A3 can better evaluate the overall strength of the pavement. When the modulus ratio E1/E2 is greater than 0.5, d0/d1 is only related to the surface modulus value. The cubic-polynomial fitting curve of the deflection basin and the radius of curvature at a distance of 0.15 m from the load center have a highly linear correlation with the modulus of surface layer and base layer. The effect of the surface layer modulus is mainly in the range of C1~C2, and the effect of the base layer modulus is mainly manifested at d8. Controlling the change of single variable (modulus), the strength of pavement structure is the most sensitive to the change of subgrade modulus; controlling the change of single variable (thickness), the strength of pavement structure is the most sensitive to the change of subgrade thickness.

Key words: road engineering, finite element, semi-rigid base asphalt pavement, deflection basin, geometric characteristics, structural strength