Abstract:In order to overcome the significant settlement difference between the road and the bridge and to essentially solve the bridge head jumping problem, a five-layer system three-dimensional finite element model was established by abaqus through the stiffness coordination analysis method, and the change law of the road and bridge transition section surface pavement performance under the action of single and multi-factor was analyzed based on fracture mechanics, and then a multi-factor fatigue life prediction model was established for the structural combination and mechanical control index The results show that: the stress intensity factor KII The results show that the stress intensity factor KⅡ decreases with the decrease of the stiffness difference between the surface layer and the subgrade, the surface layer and the lap layer, and the surface layer and the soil base. The fatigue life of surface layer decreases with the increase of surface layer modulus and axle load, and increases with the increase of surface layer thickness, base layer thickness, base layer modulus, lap layer thickness, lap layer modulus, soil base modulus and vehicle speed; the order of sensitivity to fatigue life of pavement is: surface layer thickness > vehicle speed > soil base modulus > axle load > lap layer thickness > base layer thickness > surface layer modulus > base layer modulus > lap plate modulus. The research results can provide the corresponding theoretical support for the rational design of asphalt pavement at the bridge head lap in China, and also provide a new method for the fatigue life research in China.