Calculation and Analysis of Load Stress on Typical Semirigid Base Asphalt Pavement

Abstract

The linear elastic Bisar software was used to calculate the mechanical properties of a typical semirigid pavement structure. Based on the concept of structural strength coefficient, the fatigue life of each pavement structure layer was deduced. The results show that: (1) the maximum value of deflection was obtained at x=3r/2, the maximum of the surface stress was obtained at X=r/2 and Y=0, and the peak of the principal shear stress at the bottom. (2) At the same time, the horizontal load, road surface deflection, and the maximum stress position of the surfacing surface are invariably applied at the same time. The deflection changes little, and the maximum principal stress increases faster than the maximum shear stress. (3) The cracking order of the structural layer is as follows: shear cracking of surface layer to bending and cracking of surface layer to bending and cracking at the bottom of base layer to bending and cracking at the bottom of semirigid base to bending and cracking at the bottom of the surface layer. The inner edge of a single circle is the destroying source of asphalt pavement, and the initial damage is shear bending failure. Therefore, the durable pavement should consider the principle of structural layer cracking from bottom to top and to prevent the early destruction of the surface layer. (4) The cracking of the base layer will be reflected to the semirigid base and surface layer, which is the first step of structural damage, so strengthening the construction quality of the subbase is an important measure to reduce road damage.