Method for detecting internal damage of a pavement based on passive source random excitation

Abstract

The invention discloses a method for detecting internal damage of a pavement based on passive source random excitation, which comprises the following steps: firstly, an acceleration sensor is arrangedon the pavement surface to form a detection table array; Then, the sensor collects the vibration signal of the pavement surface and transmits it to the computer by using the environmental micro-action as the excitation source. Secondly, the computer pretreats the collected vibration data of each sensor. Thirdly, the phase velocity of the surface wave is obtained by using the spatial autocorrelation method, and the dispersion curve of the surface wave is extracted. Finally, according to the depth of the surface wave- Phase velocity curve to determine whether there is damage inside the pavement. The invention uses the passive source surface wave detection theory to diagnose the damage position and degree of the pavement, scientifically evaluates the service condition and the damage condition of the pavement and the bearing capacity of the pavement, and provides a new method for solving the internal nondestructive detection of the pavement.

Description

technical field [0001] The invention relates to the field of pavement detection, in particular to a pavement internal damage detection method based on passive source random excitation. Background technique [0002] With the rapid development of the air transportation industry and the road transportation industry, aviation and road safety accidents caused by pavement damage often occur, and pavement damage detection has become an important research topic. At present, the main pavement detection methods include deflection detection, core drilling sampling, ground penetrating radar, etc.: [0003] Deflection detection is a common method for pavement structural evaluation. Sensors are distributed within 2.5-5m from the load center. Under computer control, a weight of a certain mass is dropped freely from a certain height, and the impact force Impulse loads are applied to the pavement, resulting in instantaneous deformation of the pavement, and then the surface deformation at th...

AI Technical Summary

Problems solved by technology

Drilling core sampling is scientific and intuitive, but the sampling process and experiment process are time-consuming and expensive, and it is easy to cause incomplete detection of damage by point-by-point

[0006] From the above pavement detection methods at home and abroad, it can be seen that pavement detection is a time-consuming, expensive process, and lacks timeliness

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