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

A random excitation and damage detection technology, applied in roads, roads, road repairs, etc., can solve the problems of lack of timeliness, incomplete detection of damage, and long time consumption, and achieve the effect of ensuring safe operation and improving safe operation

Inactive Publication Date: 2018-12-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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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 damag

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

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Embodiment Construction

[0031] The present invention will be further explained below in conjunction with the accompanying drawings.

[0032] A pavement internal damage detection method based on passive source random excitation, comprising the following steps:

[0033] In step 1), a number of MEMS 3-axis acceleration sensors are arranged on the pavement surface in the form of a nested equilateral triangle array to form a detection array. The radius of the detection array is determined according to the exploration depth, and 3 to 4 times the radius is used as the exploration depth, and the detection array is arranged in the radius area. In this example, if figure 1 As shown, seven GY-25Z sensors are set on the pavement surface to form two nested regular triangles, and the GY-25Z sensors on the regular triangle are located on the circumference of a large circle and a small circle.

[0034] Step 2), with environmental micro-movement as the excitation source, the GY-25Z sensor collects the vibration sig...

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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...

Claims

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Application Information

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IPC IPC(8): E01C23/01
CPCE01C23/01
Inventor 田裕鹏郑帆军王允王平
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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