Asphalt Pavement Crack Evolution Analysis System Based on Numerical Simulation and Virtual Fatigue Test

In this paper, through the organic combination of numerical simulation and virtual fatigue test, a set of systematic analysis model of asphalt pavement crack evolution is established, aiming at deeply exploring the multi-dimensional influence of fatigue load on the structural performance of asphalt pavement. In the process of analysis, the researchers used finite element simulation technology to simulate the distribution of pavement stress under different fatigue conditions in detail, and accurately identify the high-risk crack area. Based on the multi-scale modeling method, this paper further analyzed the microscopic damage behavior of the key interface areas inside the asphalt material, especially the germination and expansion path of micro-cracks, and revealed the complex mechanical reaction inside the material under the action of fatigue. In order to comprehensively quantify the influence of fatigue factors on crack development, the relationship between fatigue accumulation and crack growth was evaluated quantitatively by using indexes such as crack growth degree and crack growth rate. The results show that the mechanical properties of pavement materials deteriorate gradually with the increasing of fatigue, especially in the interfacial transition region, the elastic modulus and fracture toughness show a significant decrease trend, and the rate of crack germination and propagation also shows a nonlinear acceleration. The research in this paper not only provides theoretical support for the evaluation of asphalt pavement fatigue durability, but also puts forward a new reference and idea for future pavement design optimization and prolonging service life.