The influence analysis of the soil base and the base stiffness of highway asphalt pavement on pavement thickness

Using pavement thickness layered system computational theories and methods that current design criteria proposed, according to the result of the calculating example, this paper analyzed the influence of different soil base and the base stiffness of highway asphalt pavement for base thickness, and pointed out that thickness of pavement base decreased with increase of the soil base and the base stiffness. Therefore, optimum selecting fillers in constructing road bed beside the upper part of the roadbed, strengthening the subgrade and compacting by layer, to improve the mechanical properties of subgrade. Meanwhile, it has important significance in obtaining the obvious economic effect on decreasing thickness of pavement structure by properly using base material of high stiffness. Besides, this result indicate that the base course underside stresses increased with the base stiffness, therefore, the base course underside stresses should be checked, to ensure the corresponding the tensile strength of base material.