Analysis On The Asphalt Pavement Mechanic Under The Vehicle Braking Condition

In recent years, the transportation industry is developing rapidly, more vehicles,vehicle speed increases to the subgrade and pavement design brings some difficulties.Under the vehicle braking condition, the asphalt pavement is more prone to failure,this paper mainly by the method of numerical simulation to solve this problem.First, the static equilibrium theory, elastic theory and finite element theory, bycomparison, the finite element method for stress analysis of pavement is the bestchoice.Secondly, determine the pavement structure parameters and boundary conditionsof finite element modeling, research the rules of unit mesh, and build athree-dimensional finite element model using ANSYS software.Thirdly, according to the model, finite element analysis is done under theuniform loads and uniform deceleration loads, and by comparison the results of theacceleration loads of asphalt pavement, vertical stress, horizontal shear stress andvertical displacement are significantly increased.Finally, investigate the road damage types, causes and preventions. By thevariations of structure parameters of asphalt pavement, study the variationrespectively of the calculation results under uniform loads and braking loads, to knowincreasing of the structural parameters (surface layer modulus, surface layer thickness,base layer modulus, base layer thickness) pavement strength under the brakingcondition will increased, but the increase is limited. Through the improvement ofasphalt pavement internal frictional resistance, improve asphalt pavement adhesiveforce and the use of SBS modified asphalt and other measures, improve the asphaltpavement.