Integrated approach to studying characteristics of dynamic deformation on flexible pavement surface using nondestructive testing

A comprehensive approach to studying dynamic deformation characteristics on the surface of non-rigid pavements using nondestructive inspection techniques was proposed. It includes the analysis of the calculated and experimental bowls of maximum dynamic deflection and analysis of the dynamic response characteristics of a non-rigid road design in the frequency domain with a short-term shock loading. The results of the numerical simulation experiment were given related to the effect of adhesion loss between individual elements of non-rigid pavements on the form of amplitude-frequency characteristics (AFC) of acceleration on the pavement surface. It is established that there is only one frequency extreme point present during a complete interlaminar adhesion between all elements of the non-rigid road structure in the amplitude-frequency characteristic of acceleration frequency. With the loss of interlayer adhesion between individual elements of the non-rigid road construction, some local frequency extremes occur in the frequency response. The adequacy of numerical simulation results is based on a good match between the forms of acceleration amplitude-frequency characteristics which were calculated using an analytical model of dynamic stress-strain state and amplitude-frequency characteristics registered on the surface of non-rigid pavement coatings in natural conditions. The paper considers the issues of constructing bowls with a maximum dynamic deflection on the surface of a non-rigid pavement under the influence of a short-term shock loading. There are examples of applying the integrated approach to address the evaluation elasticity modules of structural elements in non-rigid pavements that are arranged on highways sections. This approach might be further developed to improve methods and tools for analyzing road structure behavior in the frequency domain under dynamic loading.