A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Asphalt pavement crack depth detection method based on surface wave frequency dispersion curve
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.
本发明涉及一种基于表面波频散曲线的沥青路面裂缝深度检测方法，包括以下步骤：1)获得表面波在沥青路面内传播的时域信号；2)对时域信号进行傅里叶变换，获取表面波在沥青路面内传播的频散曲线，即相速度随频率/波长变化的曲线；3)对频散曲线进行反演分析，得到剪切波速随路面深度的变化数值，并根据线弹性理论得到随深度变化的弹性模量数值，根据模量衰减率确定裂缝是否存在；4)根据表面波遇裂缝边界产生反射行为的特性，获得影响路表裂缝深度的参数，即主频散曲线内的最小波长，并得出根据该参数估计裂缝深度。与现有技术相比，本发明具有精确定位、检测裂缝刚度以及估算裂缝深度等优点。
Asphalt pavement crack depth detection method based on surface wave frequency dispersion curve
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.
本发明涉及一种基于表面波频散曲线的沥青路面裂缝深度检测方法，包括以下步骤：1)获得表面波在沥青路面内传播的时域信号；2)对时域信号进行傅里叶变换，获取表面波在沥青路面内传播的频散曲线，即相速度随频率/波长变化的曲线；3)对频散曲线进行反演分析，得到剪切波速随路面深度的变化数值，并根据线弹性理论得到随深度变化的弹性模量数值，根据模量衰减率确定裂缝是否存在；4)根据表面波遇裂缝边界产生反射行为的特性，获得影响路表裂缝深度的参数，即主频散曲线内的最小波长，并得出根据该参数估计裂缝深度。与现有技术相比，本发明具有精确定位、检测裂缝刚度以及估算裂缝深度等优点。
Asphalt pavement crack depth detection method based on surface wave frequency dispersion curve
一种基于表面波频散曲线的沥青路面裂缝深度检测方法
SHEN SHIHUI (author) / WANG XUE (author)
2020-04-21
Patent
Electronic Resource
Chinese
IPC:
E01C
Bau von Straßen, Sportplätzen oder dgl., Decken dafür
,
CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE