| Fatigue cracking is one of the major modes of premature distresses in asphalt pavement. Research on initiation mechanism and propagation behavior of cracks in asphalt pavement are very important to enhance the resistance cracking performance of asphalt pavement structure, to select optimum asphalt mixtures and to improve the present design methods.In order to model the mixed mode crack propagation behavior of asphalt mixture, a three point bending beam with mixed mode notched has been used. Simulation test has been done through quadratic orthogonal regression plan by FRANC2D software, summarise regression equations ,then makes the analysis of mixed mode crack stress intensity factor(K_â… and K_â…¡)from the load, prefabricated crack length, the different distance crack, width,height and two factors' interaction, finds main influencing factor and changing regularity ; a series of mixed mode three point bending beam with different distance have been performed to simulate mixed mode crack growth by numerical simulations. At last the experiment having been done to prove the simulating results.Crack growth for asphalt pavement with surface crack under traffic load, temperature load, and working together with two loads has been performed to simulate by FRANC2D software, respectively. The result showed that the main force of crack propagation is tensile stress; analysis the impact of the crack propagation through changes of the material parameters and the layers parameters of the structure; analysis the impact of the crack propagation while several parameters changing together by designing the orthogonal experimental, and the degree of the influence of the crack propagation with various parameters has been sorted.
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