Research On Mechanical Capability Of Stress Absorbing Layer Of High Viscoelastic Asphalt Sand

As the existence of concrete itself at the grass-roots level crack under the action of vehicle load, high viscoelastic stress absorbing layer asphalt sand will be mechanical function, such as tensile, shear and compression at the same time high viscoelastic stress absorbing layer asphalt sand as sandwich in the pavement structure layer, between it and concrete slab of interface also will be stretching and shearing action. To sum up, under the influence of several mechanics in this role, the viscous elastic stress absorbing layer of asphalt sand whether meet the requirements of mechanical strength is very necessary.So this article mainly through experiment and numerical simulation of two kinds of methods to study high viscoelastic mechanics performance of asphalt sand material. Test:1, through high viscoelastic asphalt sand SCB semicircle flexural test specimen fracture energy curve and maximum load, provide reference to test and verify the correctness of numerical simulation.2, through to the viscous elastic stress absorbing layer asphalt sand material is compressed, tar sands and concrete interface tensile two mechanics test, the purpose is to provide numerical simulation of stress absorbing layer elastic modulus and tensile strength parameter values.3, through to the viscous elastic asphalt sand material direct tensile, shear and direct the concrete interface shear between the three mechanics test, numerical simulation purpose is to provide three mechanical shear, tension, interfacial shear strength parameters. Numerical simulation aspect:1, through the establishment of basic unit cohesion between asphalt sand stress absorbed layer and contact with cracks and grass-roots of coulomb contact between two pieces of concrete slab to build the road to come into the corresponding finite element model for mechanical analysis.2, through the analysis of the path integral model in different working condition of asphalt road surface under the action of vertical deflection and asphalt, asphalt layer distribution regularity of sand layer structure mechanics.3, by changing the stress absorbing layer of asphalt sand thickness and modulus of elasticity to analyze asphalt sand layer and the maximum principal tensile stress of concrete base.4, through the asphalt sand road whole model of finite element and concrete interface between the interlayer shear stress were analyzed.Above all:on the one hand, through to the viscous elastic asphalt sand material itself is compressed and the interfacial tension test, the finite element model for road with elastic modulus, the calculation of interface between concrete and asphalt sand parameters, on the other hand, through the asphalt sand material tensile, shear and interface shear test can get corresponding asphalt sand material tensile strength, shear strength, shear strength, the intensity of the finite element model to provide reference for road, finally in order to truly simulate the actual pavement interlayer contact condition, using the two kinds of contact model (sticking together with contact and coulomb) the path of contact nonlinear finite element model was established, using the contact nonlinear finite element model to analyze the reflection crack tar sands stress absorbed layer composite pavement structure under three conditions of mechanical response, and verify whether meet the strength requirements.