The Damage Evolution Of The Concrete Pavement Under Impact Load

With the development of economics,the road transport capacity requirements become higher, but the road built earlier has suffered different degrees of damage, how to renovation old roads has become the technical problem that the road sector must face and solve. Although we have many useful attempts and technology exploration in repairing the concrete pavement with an additional asphalt overlay, but the reflective cracking always the most fundamental reason that influence the service life and capability of the additional overlay.At present, punch breaking technology often used in road reconstruction projects domestic and overseas, this technology not only can effectively control the development of reflective cracking, but also has obvious advantages in economic and energy saving, and has high efficiency. However, both the construction process and methods are according to experience, lack of uniform standards; say nothing of analyzing it from the viewpoint of mechanics.This paper derived the relationship between crack density and damage, introduced several common damage models of concrete and compared their advantages and disadvantages at first, and gave details of the concrete damaged plasticity model which this article used. Secondly, through the compression test of concrete road surface material, we got the uniaxial compression curves. We also got the damage evolution relations by combining simulation and experimental methods. According to three-point bending test, we got the tensile softening curve of concrete by using a specimen with a notch.Based on the mechanical tasting of concrete damage and numerical simulation of structural damage home and abroad , This article established a finite model to analyze the damage evolution of the concrete pavement under Impact load with the commercial finite element software ABAQUS. By simulating the concrete pavement under loading of lan pai pentagon punch breaking machine, we get the stress distributing, the damage evolution, the sedimentation of the pavement. By comparing the result from different velocity and different path, we gain construction projects that most fit the road environment.