NUMERICAL SIMULATION OF SHEAR FATIGUE LIFE OF ASPHALT MIXTURES
The existing research on the fatigue performance of asphalt mixtures mainly focuses on the bending and tensile fatigue performance of mixtures. There is not much research on the shear fatigue performance of mixtures. Based on image technology and embedded damage model 3D discrete element method,a micro mechanical model of asphalt mixture shear fatigue test is established using repeated uniaxial penetration test as the carrier. The shear fa-tigue life of asphalt mixture is simulated under different temperatures and asphalt ratios,which is verified through ex-isting experiments. The research results indicate that the three-dimensional discrete element method based on the embedded damage model effectively predicts the shear fatigue life of asphalt mixtures,and temperature and asphalt ratios have a significant impact on the shear fatigue life of asphalt mixtures. The shear fatigue life of the same as-phalt mixture decreases with increasing temperatures. The maximum shear fatigue life of asphalt mixture is achieved under the optimal oil consumption conditions with the same aggregate gradation and temperatures. The research may provide the reference and guidance for the design of anti-shear fatigue asphalt mixtures.