Shear Stress of Asphalt Pavement in Steep Slope Sections

Asphalt pavement of steep slope sections is easily to cause early disease, such as slippages, folding and rutting, because its shear strength is insufficient. There are vertical load and horizontal load resulted in braking process on asphalt pavement, the paper uses ANSYS finite elements system to analyze shear stress distribution law under different vertical and horizontal load at 20°C and 60°C respectively, which can provide theoretical basis for checking shearing strength. Analysis shows that shear stress increases with resilient modulus decreasing, for resilient modulus of asphalt mixture at 60°C is less than 20°C; Without considering horizontal load, the maximum shear stress appears at about 3 cm below surface; considering horizontal load, shear stress appears in surface, influence depth range increases with the load increasing, shear stress at 10cm in depth decreases more than 50% of that in surface, so when designing asphalt mixture, it is necessary to check the shear strength of upper and mid layers.