Structural Design And Mechanical Response Of Anti-rutting Function For High Modulous Asphalt Concrete Pavement

With the rapid development of social economy and transportation, traffic overloaded trends and highly channelizing had intensified. Rutting damage of the asphalt pavement appeared earlier that is becoming more and more popular, it has seriously influenced the safety and comfort of the running vehicle, so prevention of rutting has become solve problem. Pavement of High Modular Asphalt Concrete(HMAC) has its unique features and advantages in coping with pavements in rut disease. However, the use of it in our country is still in the early stages, it is short of a systematic study, and the pavement of high modulus asphalt concrete on the structural design also has certain blindness. The general finite element software was used in this paper to analysis the mechanical response of the high modulus asphalt concrete pavement of semi-rigid base asphalt pavement that provides theory basis for the structure design and application for the pavement of HMAC.Firstly, the 3-D element model of asphalt pavement structure was built based on the elastic mechanics. By analyzing the mechanical response when high modular layer lied in different structure position, the proper layer of HMAC is determined. Through orthogonal experiment design, the stress, strain and deformation of the pavement of HMAC is analysed with different level of each layer thickness, modulus and axle load. It shows that HMAC can significantly inhibit the rutting, and then produced the rational structure of HMAC pavement. Secondly, through uniaxial static load creep test and compressive resilience modulus test, material models and parameters of common asphalt concrete and HMAC are obtainsed on data processing and regression analysis. Based on the viscoelastic theory, three-dimensional numerical models of asphalt pavement rut are established. The comparative analysis of common asphalt concrete pavement and pavement of HMAC are made about the mechanical response. Further proof of asphalt concrete anti-rutting high modulus is certified, and the structural design of pavement of HMAC are provided. Finally, according to the asphalt pavement rut formation mechanism, and the mechanical characteristics of pavement of HMAC, the research improves the pavement of HMAC structure design method based on the existing design method. It adds permanent deformation as the Index of design and shear stress as the calculated indexes which provides a certain theoretical support for the popularization and application of the pavement of HAMC in China.