Method for detecting internal crack positions of structure body by using Rayleigh wave

A technology for internal cracks and structure detection, applied in measurement devices, geophysical surveys, seismology, etc., can solve problems such as inability to accurately detect complex structures, and achieve the effect of low survey cost and simple data processing.

Inactive Publication Date: 2017-05-10
重庆市第一中学校 +5
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Problems solved by technology

[0004] Aiming at the problem that the existing technology cannot accurately detect defects in building structures and complex structures in geology, the technical problem to be solved by the present invention is to provide a method for detecting the position of internal cracks in structures using Rayleigh waves, which can accurately detect Cracks inside the structure

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  • Method for detecting internal crack positions of structure body by using Rayleigh wave
  • Method for detecting internal crack positions of structure body by using Rayleigh wave
  • Method for detecting internal crack positions of structure body by using Rayleigh wave

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Embodiment Construction

[0024] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0025] The present invention comprises the following steps:

[0026] Step 1. Select the detection area of ​​the structure

[0027] Such as figure 1 As shown in , the excitation source is applied on the surface of the structure, and 24 Rayleigh wave probes are arranged on the surface of the structure to be inspected as receiving points (acceleration probes are selected), and there is a crack inside the structure, h T is the distance from the top of the crack to the surface of the structure, called the depth of the crack position, and α is the angle between the crack and the horizontal direction, called the dip angle of the crack. By selecting an excitation source with a certain frequency, the position of cracks within a Rayleigh wavelength depth range inside the structure can be predicted.

[0028] Step 2. Use the propagation time difference method to judge...

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Abstract

The invention discloses a method for detecting an internal crack position of a structure body by using the Rayleigh wave. The method comprises the following steps of (1) selecting a detection area of the structure body, arranging a Rayleigh wave excitation source on the surface of the structure body, and arranging multiple receiving points; (2) calculating a horizontal distance from one receiving point to the top end of a crack by using a propagation time difference between an incident Rayleigh wave and a reflected Rayleigh wave of the receiving point near the excitation source; and (3) searching corresponding crack position depth hT and crack dip angle alpha from a curve according to the calculated Rayleigh wave amplitude ratio AI. The method has the advantages that (1) field detection equipment is simple and portable; (2) an artificial seismic source is utilized; (3) data processing is relatively simple; (4) the survey cost is relatively low; and (5) the depth and angle of the internal crack can be accurately determined by combining a few of drill holes.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, and in particular relates to a method for detecting crack positions inside a structure by using Rayleigh waves. Background technique [0002] With the development of engineering construction, the detection objects often encountered in engineering seismic exploration are no longer simple stratum boundaries and bedrock undulating spatial forms, but some small geological structures with non-uniform and complex forms. In the past, geometric seismology-based The reflection method and refraction method of a single seismic phase on the Internet have problems such as small detection area, slow detection speed, and great influence by the site, and cannot be fully applied to the exploration of such complex structures, and cannot accurately detect defects in building structures and Complex structures in geology. [0003] The Rayleigh wave survey method is mainly used in the fields of civil ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/00
CPCG01V1/00
Inventor 岑睿楠程浩寿云东李金鑫
Owner 重庆市第一中学校
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