Structural Design Optimization Of Long-Life Pavement Based On Dynamic Response

The long-life semi-rigid pavement is designed according to the traditional static load.It is far from the real state of the actual pavement structure response under the action of vehicle load.In this thesis,Abaqus is used to establish the long-life semi-rigid pavement structure model,and the dynamic response of the pavement structure under the action of moving constant load is studied.In this way,the response of actual pavement structure can be better simulated.The single variable analysis method was used to obtain the main influencing factors of pavement structure response and optimize the pavement structure parameters.A reasonable orthogonal test is designed to comprehensively evaluate the dynamic response of the structure.The thesis completes the combination optimization of long-life pavement structure.The main research work is as follows:(1)Through Abaqus simulation of long life semi-rigid pavement structure,the dynamic response of pavement structure under steady harmonic load is obtained.Compared with the existing references,the rationality and correctness of the pavement structure model were verified.(2)Under the action of moving constant load,the influence law of 25 influencing factors on the response of pavement structure is analyzed.The influencing factors are the thickness of structure layer,elastic modulus,poisson’s ratio,damping,driving speed and driving load amplitude.The single factor analysis method was used to determine the 19 main influencing factors,and the order of the 19 influencing factors was based on the degree of influence on the dynamic response of pavement structure.According to the sensitivity analysis,eight significant influencing factors were determined,among which the influence of damping coefficient on pavement structure could be neglected.(3)According to the orthogonal theory,the orthogonal test scheme for the response of long-life semi-rigid pavement structure is designed.For the 19 major influencing factors,8 three-level and 11 two-level orthogonal tests are adopted.The orthogonal table of L36(38 * 211)was generated by Minitab software analysis.The dynamic response of each scheme is evaluated by the comprehensive balance method and the comprehensive scoring method,Finally,the optimal recommendation scheme is obtained.