| The old cement concrete pavement with asphalt surface layer is a practical and effective way of paving transformation,which can not only overcome the shortcomings of cement concrete pavement and asphalt pavement,concentrate on the advantages of two road surface structures,just soft,but also has the advantages of low cost,convenient construction,small impact on the environment and traffic.However,due to the old cement concrete panels exist seams,cracks,broken plates and other issues,driving load repeated action,easy to cause the addition of layer reflective cracks,seriously affecting the "white to black" composite road life.Based on how to take effective measures to delay reflective cracks and increase road fatigue life,the dissertation mainly carries out the following research:(1)Based on the D’Alembert principle and the theory of elastic stratification system,the vibration differential equation of vehicle model and the vibration equation of road structure system are deduced respectively.Then,according to the condition of tire displacement compatibility,the power balance equation system of car-road interaction system is established.(2)Based on the ABAQUS finite element software,the car-road interaction model is established,the influence of the setting stress absorption layer on the stress and bending of the layer is analyzed,the influence of the thickness of each layer and the change of material modulus on the dynamic response of the road surface structure is studied,and the thickness and material modulus recommended values of the paved structure layer are given.(3)Based on the ABAQUS finite element software,a car-road interaction model of the ultra-high section of the bend is established,the formula of wheeled calculation of the curved road segment is derived,the influence law of shaft load and driving speed on the dynamic response of the road structure is studied,and the change law of the road structure dynamic response is further analyzed in the contact state between different layers.(4)The applicability of two asphalt pavement fatigue life estimation models with asphalt plus paving floor strain and old cement concrete panel floor pull stress as arguments is compared and analyzed.Then,based on the results of the structural dynamic response of the road surface of the ultra-high section of the bend,the influence law of shaft load and driving speed change on fatigue life was studied. |
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