Mechanical Response Analysis Of Full Depth Asphalt Pavement In Port Area

Full-depth asphalt pavement,as a thick layer of asphalt concrete pavement structure with broad development prospects in recent years,has unique advantages over other traditional types of asphalt pavement: pavement damage is limited to the surface layer and does not require major structural repairs;Subsequent maintenance and use costs are greatly reduced;it can be continuously developed as a long-life pavement.Aiming at the problem that the roads in the port area require higher pavement structural performance than ordinary roads,the full-depth asphalt pavement gives a new design choice.In view of the fact that there is still little domestic research on this aspect,this thesis will conduct a structural mechanical performance study on the design and use of full-thick asphalt pavement in the port area.The main work is as follows:Firstly,this thesis refers to the requirements of the “Code for Design of Port Roads and Yards” to determine the design type,service life,and load level of the pavement structure of the road in the port area,and clarifies the structural types and pavement base materials of the full-depth asphalt pavement design requirements.Test the performance requirements of the asphalt mixture used in the full-depth asphalt pavement structure.According to the current "Code for Design of Highway Asphalt Pavement",two design indexes of the bottom tensile strain and the rutting resistance of the asphalt layer are summarized and used as the comparative indexes of the structural stress performance research in subsequent chapters.Secondly,the finite element method was used to compare and analyze the differences in mechanical properties of the full-depth,semi-rigid type base,and composite asphalt pavement structures.Starting from the three angles of structural deformation,tensile strain at the bottom and maximum shear stress,and considering the effect of economic benefits,the feasibility of the application of full-depth structures is discussed.On this basis,by changing the parameters of the structural layer and analyzing the impact of the asphalt mixture modulus and thickness on the overall stress performance of the full-depth pavement,it will provide a certain reference for the future design of the road in the port area.Finally,in view of the rutting problem that is common to asphalt pavements,a temperature field model suitable for the climate of the port area is established under the consideration of the external environmental factors.According to the previous research results,the rutting deformation of the road surface is calculated under the action of the temperature field.Contrast and analyze the cumulative deformation of the road surface after 500,000 axle loads under various load levels and the deformation trend with the number of times of action.The study obtained the deformation law of the pavement structure after repeated load action,and can put forward certain measures and suggestions for controlling the rutting deformation of the asphalt pavement in actual engineering.The research results of this thesis can provide theoretical support for the design and use of full-depth asphalt pavement in the port area,and have certain application value.