Method for detecting thickness of water body dam based on elastic waves of ground penetrating hammering

By exploring the ground hammer to excite elastic waves and using multi-channel signal acquisition and time-frequency conversion processing technology, the shortcomings of the existing water dam thickness detection methods are solved, and accurate, non-destructive and comprehensive inspection are achieved, ensuring the safety performance of the dam.

CN119714149APending Publication Date: 2025-03-28JIANGSU COAL GEOLOGICAL SURVEY TEAM
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Patent Information

Application Number
CN202411895438.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-22
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing water dam thickness detection methods have problems such as destructive, low accuracy and susceptible to environmental interference, making it difficult to achieve accurate, non-destructive and comprehensive inspection.

Method used

The detection method based on ground-explosive hammer elastic wave is adopted, and the elastic wave is excited by designing the bottom-explosive hammer source hammer operation, combined with multi-channel high-precision signal acquisition and time-frequency conversion processing technology, thickness calculation and result analysis are realized.

Benefits of technology

Accurate, non-destructive and comprehensive inspection of the thickness of the water dam dam is achieved, avoiding secondary damage to the dam dam by the inspection process, and ensuring the normal operation and safety performance of the dam dam.

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Abstract

The invention provides a method for detecting the thickness of a water dam based on ground penetrating hammering elastic waves, and the method comprises the steps: selecting the specification of a hammer head of ground penetrating hammering equipment according to the structural design of the dam, and arranging receiving sensors for detecting elastic wave signals at a dam top and a dam slope according to the planning of observation points; at each measuring point, the drop hammer is lifted to a preset height, the drop hammer is released in a free falling mode, and an elastic wave signal is collected through a sensor; preprocessing the signal, and then performing time-frequency analysis by adopting Fourier transform to obtain a time-frequency spectrogram; according to the time difference of elastic waves received by different sensors and the distance wave velocity between the sensors; estimating the thickness of the dam according to the propagation time and the wave velocity of elastic waves from excitation to receiving of bottom surface reflection echoes; and the dam thickness obtained through calculation and the design thickness are subjected to detailed comparison, the thickness deviation ratio is calculated, and abnormity judgment is carried out based on the thickness deviation allowable range.
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