CN106646586A - Method for detecting internal crack positions of structure body by using Rayleigh wave - Google Patents
Method for detecting internal crack positions of structure body by using Rayleigh wave Download PDFInfo
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- CN106646586A CN106646586A CN201611219993.7A CN201611219993A CN106646586A CN 106646586 A CN106646586 A CN 106646586A CN 201611219993 A CN201611219993 A CN 201611219993A CN 106646586 A CN106646586 A CN 106646586A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
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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
The invention belongs to technical field of nondestructive testing, and in particular to one kind utilizes Rayleigh wave test construction inner crack position
The method put.
Background technology
With the development of engineering construction, the detected object being commonly encountered in Engineering seismic prospeCting is no longer simple bed boundary
With the spatial shape of bedrock relief, but the geology little structure of some non-homogeneous complicated forms is in the past conventional based on geometrically
The bounce technique and refraction process of the single seismic phase that shake is learned, has that area of detection is little, detection speed slow, is asked by site influence is big etc.
Topic, it is impossible to be suitable for the exploration of such complicated structure completely, it is impossible to accurately detect out the defect and geology in building structure
Middle labyrinth.
R wave exploration method is mainly used in civil engineering, geologic survey（The structure detection of building and geologic prospect）
Deng field, in the multinational Japan of earthquake, R wave exploration method has been applied to reconnoitring for earthquake territory underground structure.Get in urban architecture
Carry out today that more, engineering technology requires to improve constantly, traditional geophysical exploration method is increasingly restricted, R wave
Exploration method has shown its superiority as a kind of brand-new geophysical exploration method, in physical prospecting.
The content of the invention
For prior art cannot be in accurate detection building structure defect and geology in labyrinth problem, this
Bright technical problem to be solved is just to provide a kind of method of utilization Rayleigh wave test construction inner crack location, and it can
Construction inner crack is detected exactly.
The technical problem to be solved realizes that it is comprised the following steps by such technical scheme：
Step 1, the detection zone for selecting structure, on structure surface R wave driving source is arranged, and arranges multiple receiving points；
Step 2, the horizontal level in construction inner crack is judged using propagation time difference method
The receiving point is calculated with the propagation time difference near the incident R wave of a receiving point of driving source and reflection R wave
Away from the horizontal range of crack tip：
In formula, VRFor the spread speed of R wave, tRThe time at the receiving point, t are reached for incident R waveRRTo reflect Rayleigh
Ripple reaches the time at the receiving point；
Step 3, judged using energy magnitude method fracture depth and fracture dip
Calculate the R wave amplitude ratio AI=A at receiving point directly over crack1/A0
A 1 For the Rayleigh wave amplitude maximum of receiving point directly over crack,A 0 It is auspicious for free from flaw structure correspondence position receiving point
Sharp wave amplitude；
By many experiments, R wave amplitude ratio AI and crack location depth h on structure are obtainedTVariation relation curve,
With the variation relation curve of R wave amplitude ratio AI and fracture dip α, lead to according to the R wave amplitude ratio AI obtained by calculating
Cross and corresponding crack location depth h is searched from curveTWith fracture dip α.
So the solution have the advantages that：Construction inner crack can be exactly detected using R wave.With it is existing
Technology is compared with advantages below:1st, field testing equipment is simply portable；2nd, man-made explosion is utilized；3rd, data processing is relatively simple
It is single；4th, cost is surveyed relatively low；5 in combination with a small amount of drilling, can accurately determine the depth and angle of internal fissure.
Description of the drawings
The description of the drawings of the present invention is as follows：
Fig. 1 is that driving source arranges schematic diagram with receiving point；
Fig. 2 is that R wave propagates schematic diagram；
Fig. 3 is the Rayleigh wave amplitude of one embodiment and the position relationship curve of receiving point；
Fig. 4 is the Rayleigh wave amplitude of free from flaw structure and the position relationship curve of receiving point；
Fig. 5 is AI-hTCurve（Structure selects concrete material, and crack inclination α is 90 °, and fracture length is 60mm）；
Fig. 6 is AI- α curves（Structure selects concrete material, crack location depth hTFor 20mm, fracture length is 60mm）.
In figure：1. exciting bank；2. structure surface；3. crack；4. structure；5～30. R wave are popped one's head in；31. is incident
R wave；32. reflection R wave.
Specific embodiment
With reference to the accompanying drawings and examples the invention will be further described：
The present invention is comprised the following steps：
Step 1, the detection zone for selecting structure
As shown in figure 1, apply driving source on structure surface, and in 24 R wave probe conducts of structure surface layout to be checked
Receiving point（From acceleration probe）, construction inner has a crack, hTFor the distance of crack tip to structure surface, claim
For crack location depth, α is the angle in crack and horizontal direction, referred to as fracture dip.The driving source of selected certain frequency, can
Crack location in one rayleigh wavelength depth bounds of construction inner is predicted.
Step 2, the horizontal level in construction inner crack is judged using propagation time difference method
As shown in Fig. 2 applying driving source on structure surface, incident R wave 31 is in ground roll type crack 3 along structure surface
Locality is propagated, and when incident R wave 31 travels to 3 surface of crack, part incidence R wave 31 can be anti-through fracture faces
Penetrate, obtain reflection R wave 32, propagate along structure surface to the opposite direction of incident R wave.Extract between driving source with split
A receiving point between seam（Such as receiving point 5）Received incident R wave 31 and reflection R wave 32, during using propagating
Differences method calculates horizontal range of the receiving point away from crack tip：
In formula, VRFor the spread speed of R wave, its size is using the R wave propagation time curve at any one receiving point
Try to achieve；tRThe time at receiving point, t are reached for incident R waveRRTo reflect the time at R wave arrival receiving point；
Step 3, judged using energy magnitude method fracture depth and fracture dip
The characteristics of R wave is that energy is concentrated in one rayleigh wavelength length range of dielectric surface.As shown in figure 1, excitation
The suitable excited frequency in source（I.e. R wave is able to detect that internal fissure and high precision）Exciting is carried out on structure surface, is carried
The oscillogram of 24 receiving points is taken, the position relationship curve of Rayleigh wave amplitude and receiving point is made, as shown in figure 3, can obtain：
The receiving point on structure surface directly over crack（It is set to receiving point m）There is significant fluctuation in place, the curve, and occurs one
Individual Rayleigh wave amplitude maximum, uses A1Represent.
In order to eliminate the impact of structure material damping, control group is set：
Driving source is used and the identical excited frequency of body containing fissured structure, and internally fissureless structure surface carries out exciting,
The oscillogram of 24 receiving points is extracted, the position relationship curve of R wave energy magnitude and receiving point is equally made, such as Fig. 4 institutes
Show, it is A to extract the Rayleigh wave amplitude at receiving point m0, calculate R wave amplitude ratio AI=A1/A0。
Structure to same material, by changing crack location depth hTRepeatedly tested with fracture dip α：
The long L=800mm of Selection Model, high a=200mm, the width in crack is 1mm, and the length in crack is taken as 60mm, and crack is away from focus
Horizontal range be 380mm, crack location depth be hT, h is chosen respectivelyTFor 10mm, 20mm, 30mm, 40mm, 50mm, 60mm,
Nine kinds of design conditions of 70mm, 80mm, 90mm are analyzed, and draw out R wave amplitude ratio AI as shown in Figure 5 and crack position
Put depth hTRelation curve, as can be seen from Figure 5, R wave amplitude ratio AI is with crack location depth hTIncrease and reduce；In actual work
In journey measurement, as long as determining the value of AI, h can be just obtainedTValue.
For asking for crack angle [alpha], its method with seek hTIt is identical.The relation of R wave amplitude ratio AI and fracture dip α
Curve is as shown in Figure 6.As can be seen from Figure 6, R wave amplitude ratio AI also reduces with fracture dip α increases.
According to AI in curve and crack tip depth hT, quantitative relation between fracture dip α, draw hT, α calculating it is public
Formula, by determining the value of AI h can be just drawnT, α value.
Claims (1)
1. a kind of method of utilization Rayleigh wave test construction inner crack location, is characterized in that, comprise the following steps：
Step 1, the detection zone for selecting structure, on structure surface R wave driving source is arranged, and arranges multiple receiving points；
Step 2, the horizontal level in construction inner crack is judged using propagation time difference method
The receiving point is calculated with the propagation time difference near the incident R wave of a receiving point of driving source and reflection R wave
Away from the horizontal range of crack tip：
In formula, VRFor the spread speed of R wave, tRThe time at the receiving point, t are reached for incident R waveRRTo reflect Rayleigh
Ripple reaches the time at the receiving point；
Step 3, judged using energy magnitude method fracture depth and fracture dip
Calculate the R wave amplitude ratio AI=A at receiving point directly over crack1/A0
A 1 For the Rayleigh wave amplitude maximum of receiving point directly over crack,A 0 For free from flaw structure correspondence position receiving point Rayleigh
Wave amplitude；
By many experiments, R wave amplitude ratio AI and crack location depth h on structure are obtainedTVariation relation curve, and
The variation relation curve of R wave amplitude ratio AI and fracture dip α, passes through according to the R wave amplitude ratio AI obtained by calculating
Corresponding crack location depth h is searched from curveTWith fracture dip α.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111595374A (en) * | 2020-05-06 | 2020-08-28 | 三峡大学 | Telegraph pole buried depth and damage detection method based on Rayleigh waves |
| CN113158512A (en) * | 2021-03-24 | 2021-07-23 | 东南大学 | Simulation method for detecting surface crack depth of structural body by utilizing Rayleigh surface waves |
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| CN102426192A (en) * | 2011-09-16 | 2012-04-25 | 北京交通大学 | Method of applying Rayleigh waves in non-linear ultrasonic evaluation of surface damage of metal material |
| CN103018337A (en) * | 2012-12-25 | 2013-04-03 | 上海交通大学 | Surface wave-based nondestructive testing method and system for internal concrete state |
| CN104345346A (en) * | 2014-10-30 | 2015-02-11 | 中国石油天然气股份有限公司 | Method for obtaining crack widths |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111595374A (en) * | 2020-05-06 | 2020-08-28 | 三峡大学 | Telegraph pole buried depth and damage detection method based on Rayleigh waves |
| CN111595374B (en) * | 2020-05-06 | 2021-10-19 | 三峡大学 | Telegraph pole buried depth and damage detection method based on Rayleigh waves |
| CN113158512A (en) * | 2021-03-24 | 2021-07-23 | 东南大学 | Simulation method for detecting surface crack depth of structural body by utilizing Rayleigh surface waves |
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Application publication date: 20170510 |