A method for detecting wall leakage based on surface acoustic waves

A surface acoustic wave and wall technology, which is applied in the direction of detecting the appearance of fluid at the leakage point, testing the fluid tightness by using an electrical device, and measuring the fluid tightness by using liquid/vacuum degree, etc., can solve the problem of low spatial resolution, A very small part cannot be distinguished, etc., to achieve the effect of high spatial resolution, short wavelength and high frequency

Active Publication Date: 2022-03-22
TIANJIN UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the traditional ground exploration method has low spatial resolution and cannot distinguish small parts, and proposes a method for detecting wall leakage based on surface acoustic waves, and processes the collected signals to realize the detection of leakage. leak detection

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  • A method for detecting wall leakage based on surface acoustic waves

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] There will be a water-stop curtain in the foundation construction to prevent groundwater from seeping into the foundation. Preventing the leakage of the water-proof curtain during the construction process is related to the construction of the entire project. It is very important to detect the curtain. This invention proposes a new method to detect Waterproof curtain, that is, a method for detecting wall leakage based on surface acoustic waves.

[0027] The present invention adopts drilling or a side well using a water-stop curtain, puts the transmitting probe and the receiving probe into the well to excite ultrasonic signals, and detects and processes the acoustic waveform at each depth by moving. The moving distance determines the length of the longitudinal detection. resolution; the present invention provides an acoustic wave probe placed on the plane to be me...

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Abstract

The invention discloses a method for detecting wall leakage based on surface acoustic waves: the downhole ultrasonic transmitting probe is physically connected with the downhole ultrasonic receiving probe, lowered into the wellbore, and clean water is used as coupling agent; the planar ultrasonic receiving probe is arranged on the plane to be tested, Butter is used as coupling agent; drilling measurement; plane test to be measured; extracting the waveform collected in the drilling, drawing according to the depth, removing the direct wave and retaining the reflected wave; Use the phase method to obtain the time-difference frequency diagram of the waveform, and perform Fourier transform on each waveform to obtain the main frequency, find out the corresponding time difference, draw the time-depth curve, and the abnormal point indicates the leakage position; draw the in-plane to be measured All the sound waves received by the probes, frequency and phase analysis, use the phase method to obtain the time difference frequency relationship, and distinguish the wall leakage and leakage location.

Description

technical field [0001] The invention belongs to the special technical field of underground foundation and underground structure exploration in the early stage of ground engineering construction, and more specifically relates to a method for detecting wall leakage based on surface acoustic waves. Background technique [0002] The leakage detection of foundation pit is related to the safety of subsequent excavation construction and the safety of surrounding buildings and roads. It is an effective means to prevent major safety accidents to detect the leakage of the water-stop curtain of the foundation pit and take effective measures in advance. At present, there is no complete foundation pit leakage detection method and equipment. The direct current method uses the high resistivity and poor conductivity of the water-stop curtain, and the good conductivity of the soil filled with the leakage site. The current passes through the leakage site and detects the abnormal electric fie...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M3/24G01M3/40
CPCG01M3/24G01M3/40
Inventor 沈建国朱少杰
Owner TIANJIN UNIV
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