Asphalt Mixture Rutting Deformation Of The Computer Simulation

At the effect of repeat traffic loading, the permanent deformation by hot weather and rutting is typical symptoms of asphalt pavement damage. Since the traffic volume is increasing continuously, the weight of vehicle loading is increasing gradually and the length of traffic channelled highway is increasing rapidly, the status of severe rutting in short time arises frequently. For this reason, it is necessary for us to carry out further research.The wheel tracking test perfectly simulate the field stress status, simple and applicable. The deformation and DS(Dynamic Stability) of the wheel tacking test are becoming the criterion of rutting resistance. However, the wheel tracking test has its demerit, because we cannot get the basic mechanics parameter and estimate the evolution of the deformation.In the paper, viscoelastic theory and ANN(Artificial Neural Network) are applied to estimate DS and draw the curve of deformation. Viscoelastic theory is applied in wheel tracking test. The specimen of the test was stimulated by viscoelastic model and the wheel load was stimulated by special function, which are brought into viscoelastic equation. After solving the equation, we can work out the theoretical answer. Thus we can figure out the DS and the deformation curve. By prolonging the deformation curve, we can estimate the tendency of deformation. In the paper, by using BP(Back Propagation) method of ANN, we can get the relationship between grading, asphalt-aggregate ratio, bulk density, percentage of voids, test temperature and DS. At the same time, we can get the relationship between grading, asphalt-aggregate ratio, bulk density, percentage of voids, test temperature and viscoelastic parameter. At last, we can estimate the DS and draw the deformation curve.On the basis of the paper, we write a program to estimate DS and draw deformation curve. Using this program, we can estimate DS and draw deformation curve conveniently. Moreover, we can estimate the tendency of the curve evolution. This program can also be a reference to the asphalt mixture grading design. It can help in selecting grading roughly and saveing time in asphalt mixture design.