Dynamic Simulation Of Vibration Compaction Of Semi-Flexible Pavement Materials

Compaction is one of the core indicators to evaluate the quality of highway construction,full and effective compaction can make the roadbed and pavement each structural layer with sufficient stability,durability,flatness,compactness,so that the strength and stiffness of the roadbed and pavement structural layer to give full play to the high degree of compaction,the highway in the process of use can almost eliminate subsidence,improve the bearing capacity,water seepage resistance and service life.The vibratory compaction process is a dynamic process of interaction between the pavement material and the vibratory roller.The vibration parameters of the roller that can achieve good compaction results are determined by the nature of the semi-flexible pavement material and the environmental conditions of the construction site,while the compaction effect of the semi-flexible pavement material depends on the operating parameters such as the travel speed,vibration frequency,amplitude,and excitation force of the roller.In order to study the dynamic response of the vibratory roller and the pavement material under the action of the excitation force,to investigate the influence of the vibration parameters on the compaction effect,to investigate the changes of the pavement material parameters during the compaction process,and to further investigate the mechanism of the vibratory compaction operation,it is necessary to establish a kinetic model as close as possible to the actual working conditions in order to facilitate the theory and analysis and calculation.This paper takes the vibration compaction process of semi-flexible pavement as the research object,analyzes the vibration compaction mechanism of semi-flexible pavement,establishes the dynamics model of vibration compaction process of semi-flexible pavement,and uses Matlab and Adams software to model and simulate the vibration compaction system,and draws the following conclusions and results:(1)By analyzing the compaction mechanism of the vibratory roller,the kinetic model of the vibratory compaction process is established,the kinetic equations are established according to the established kinetic model,and the two operating states of the vibratory roller,i.e.grounding and jumping vibration conditions,are analyzed theoretically;(2)The stiffness and damping values of the semi-flexible pavement material under certain conditions were determined using the parameter identification method,and the dynamics model of the vibratory compaction system was simulated and analyzed in Matlab to derive the dynamic response law of the speed,displacement and acceleration of the vibratory wheel during the vibratory compaction process in relation to the stiffness and damping of the semi-flexible pavement material;(3)The simulation analysis of the semi-flexible pavement vibration compaction system was carried out using Adams software to verify the rationality of the established vibration compaction system,and the relationship between the damping and stiffness of the semi-flexible pavement material and the vibration acceleration of the vibration wheel was derived,followed by the relationship between the compaction degree and the vibration acceleration,and a detailed analysis of the jump vibration condition was carried out;(4)The simulation results of Matlab and Adams were compared and analyzed,and the results were found to be basically consistent.From the theoretical point of view,the correctness and validity of using vibration acceleration to characterize the compaction magnitude were illustrated,and a real-time compaction detection system was established based on the above theoretical and simulation results,and the hardware of each module of the system was designed and selected.