Nondestructive test method for depth and horizontal position of hidden crack of road base

A technology of road base and horizontal position, applied in the direction of electromagnetic wave detection, etc., can solve problems such as heavy workload, destructive roads, and inability to adapt to detection tasks, and achieve the effect of improving positioning accuracy.

Inactive Publication Date: 2014-03-26
ZHENGZHOU UNIV
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Problems solved by technology

In the face of the sharp increase in the workload of road quality evaluation, traditional destructive testing technologies such as core drilling and sampling cannot adapt to the current testing tasks due to the characteristics of heavy workload and destructiveness to the road.

Method used

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  • Nondestructive test method for depth and horizontal position of hidden crack of road base
  • Nondestructive test method for depth and horizontal position of hidden crack of road base
  • Nondestructive test method for depth and horizontal position of hidden crack of road base

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Embodiment Construction

[0023] Such as figure 1 As shown, the non-destructive testing method for the depth and horizontal position of hidden cracks in the road base includes the following steps:

[0024] Firstly, the dielectric constant of the medium is detected by ground penetrating radar, and the actual dielectric constant value ε is obtained through inversion calculation; specifically, the dielectric constant value m is preset for the ground penetrating radar, and a point is made for the non-cracked road base. Measure and read out point to measure time t, because for the same medium, when the time is determined, it can be known that the ratio of the dielectric constant is equal to the reciprocal ratio of the square of the corresponding medium thickness, so the actual value of the dielectric constant ε can be obtained according to the actual measurement of the thickness of the base layer , which will be described below with specific examples. In this example, C15 grade cement is used, and the mixi...

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Abstract

The invention discloses a nondestructive test method for the depth and horizontal position of a hidden crack of the road base. The method comprises that corresponding data images are obtained by continuous measurement via a ground penetration radar and manual spot measurement, the position of the crack is approximately determined, on the basis, the data images are analyzed in an ellipse method to improve the positioning precision, and the length and depth of the crack in the semi-rigid base are accurately positioned. Via continuous measurement based on the ground penetration radar and the manual spot measurement, the error of the obtained horizontal position of the crack of the semi-rigid base reaches 4.4%, and the error of the upper depth of the crack reaches 32%. After data analysis via the ellipse method, the error of the horizontal position of the crack of the semi-rigid base reaches 2.2%, and the error of the upper depth of the crack reaches 22%, wherein the precision of the horizontal position is improved by 2.2%, and the precision of the upper depth of the crack is improved by 10%. Thus, accurate data basis can be provided for crack maintenance, and the nondestructive test method of the invention has significant theoretical and practical values.

Description

technical field [0001] The invention relates to a method for detecting the depth and horizontal position of hidden cracks in the road base, in particular to a non-destructive detection method for the depth and horizontal position of hidden cracks in the road base. Background technique [0002] At present, my country's expressways are developing rapidly, due to the advantages of semi-rigid materials with high initial strength, good plate properties, impermeability and frost resistance[ 1 ], the use of semi-rigid materials has been widely promoted, and at the same time, the detection tasks of road quality are also increasing, and the evaluation of road use status has become an important task at present. Faced with the sharp increase in the workload of road quality evaluation, traditional destructive testing techniques such as core drilling and sampling, due to the characteristics of heavy workload and destructive to the road, can no longer adapt to the current testing tasks. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/12
Inventor 李胜利孙攀旭姜楠朱小青陈淮
Owner ZHENGZHOU UNIV
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