A Crack Depth Detection Method for Asphalt Pavement Based on Surface Wave Dispersion Curve

Abstract

The invention relates to an asphalt pavement crack depth detection method based on a surface wave frequency dispersion curve. The method comprises the following steps: 1) obtaining a time domain signal of propagation of a surface wave in an asphalt pavement; 2) performing Fourier transform on the time domain signal to obtain a frequency dispersion curve of the surface wave propagated in the asphalt pavement, namely a curve of the phase velocity changing along with the frequency / wavelength; 3) performing inversion analysis on the frequency dispersion curve to obtain a change value of the shearwave velocity along with the pavement depth, obtaining an elastic modulus value changing along with the depth according to a linear elasticity theory, and determining whether a crack exists or not according to the modulus attenuation rate; and 4) according to the characteristic that the surface wave generates a reflection behavior when encountering the crack boundary, obtaining a parameter influencing the road surface crack depth, i.e., the minimum wavelength in the main frequency dispersion curve, and obtaining the estimated crack depth according to the parameter. Compared with the prior art,the method has the advantages of accurate positioning, crack rigidity detection, crack depth estimation and the like.

Description

technical field [0001] The invention relates to the field of non-destructive detection of asphalt pavement in road engineering, in particular to a method for detecting crack depth of asphalt pavement based on surface wave dispersion curve. Background technique [0002] Since cracks can directly affect the performance and integrity of the pavement structure, the evaluation of cracking performance occupies a relatively important part in the evaluation of the bearing capacity of asphalt pavement. The cracking performance at the crack is closely related to the attenuation of the modulus, so the measurement of the modulus of the asphalt pavement is indispensable. At present, there are two main methods for evaluating the modulus of asphalt pavement: on-site coring indoor laboratory test and on-site non-destructive testing. However, on-site coring will damage the integrity of the pavement and destroy the original confining pressure of the pavement on the core sample. Therefore, d...

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Problems solved by technology

[0003] In previous studies, although it is not uncommon for scholars to use the SASW method to study asphalt pavement cracks, they mainly simulated it through the finite element method, and there are very few field experiments to support the quantification of the surface wave dispersion curve characteristics. Relationship with Asphalt Pavement Cracks

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