Method for detecting wall leakage based on surface acoustic wave

Abstract

Disclosed is a method for detecting wall leakage based on surface acoustic wave. An underground ultrasonic transmitting probe and an underground ultrasonic receiving probe are physically connected, the underground ultrasonic transmitting probe and the underground ultrasonic receiving probe are put into a shaft, and clear water is taken as a coupling agent; a plane ultrasonic receiving probe is arranged on a to-be-detected plane, and butter is a coupling agent; well drilling measurement is conducted; the to-be-tested plane is tested; collected waveforms in well drilling are extracted and drawn according to depth, direct waves are removed, and reflected waves are reserved; reflected waves of different receiving probes at different depths are drawn, a time difference frequency diagram is obtained by using a phase method for waveforms of different receiving probes at the same depth, Fourier transform is performed on each waveform to obtain a dominant frequency, a corresponding time difference is found out, a time-depth curve is drawn, and an abnormal point indicates a leakage position; sound waves received by all the probes in the to-be-tested plane are drawn, frequency and phase analysis are conducted, the time difference frequency relation is obtained through a phase method, and wall leakage and leakage positions are distinguished.

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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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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