Influence of Overload on Stress Distribution and Stability of Expressway Asphalt Pavement
Based on a upgrade and renovation project,the BISAR program analysis method is used to study the impact of vehicle overload on the asphalt pavement structure of the expressway.The changes in road surface deflection,tensile stress and strain at the bottom of the layer,compressive stress and strain at the top of the layer,and pavement shear stress and strain are analyzed.The research results indicate that with the increase of axle load,the road surface deflection increases linearly,and the bending tensile stress increases accordingly.The compressive stress,tensile stress,compressive strain,and tensile strain of the road surface structure increase gradually.When the axle load is different,compared to the rated axle load,the compressive stress and compressive strain on the road structure significantly increase when the axle load is 225kN.As the axle load increases,the shear stress and strain of the road surface structure under the center of the wheel gap and the edge of the wheel track gradually increase.In actual expressway upgrading and renovation projects,it is recommended to increase the structural strength of the pavement structure within a depth range of 2.5～10cm,or increase the material stiffness.At the same time,overloading of vehicles is prohibited to control the damage to the highway pavement structure.
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