Acoustic monitoring method for beam-direction stress state near foundation surface of concrete dam

Through acoustic monitoring methods, the acoustic wave velocity near the foundation surface of the concrete dam is measured and separated, and accurate monitoring and early warning of beam direction stress is achieved, and the problems of large errors and inability to detect long distances in the existing technology are solved, which improves the reliability of safety management.

CN120176896APending Publication Date: 2025-06-20CHINA YANGTZE POWER +2
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Patent Information

Application Number
CN202510257112.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-05
Publication Date
2025-06-20

AI Technical Summary

Technical Problem

It is difficult for the prior art to accurately measure and monitor the beam stress near the foundation surface of the concrete dam, especially in the environment of hydraulic concrete, with large errors and long-distance detection cannot be achieved.

Method used

The acoustic monitoring method is adopted to measure the time difference between the sound wave transmitting signal and the received signal, calculate the sound wave speed, separate the elastic wave speed and viscous wave speed, monitor the sound wave speed for a long time, monitor the reservoir water level synchronously, filter out the influence of the water level change and temperature change of the reservoir, and obtain the change curve of the elastic wave speed with time. When the slope of the change curve suddenly changes, an alarm signal is issued.

Benefits of technology

Accurate measurement and monitoring of the directional stress of beams near the foundation surface of the concrete dam is achieved, reducing the influence of strain rate effect and environmental factors, and can issue early warning signals, improving the reliability of safety management.

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Abstract

The invention discloses an acoustic monitoring method for a beam-direction stress state near a foundation surface of a concrete dam. The acoustic monitoring method comprises the following steps: S1, measuring a time difference between a sound wave transmitting signal and a sound wave receiving signal; s2, calculating the sound wave velocity of sound waves propagating along the upstream and downstream directions of the foundation surface of the dam body; s3, elastic wave velocity and viscous wave velocity are separated; s4, monitoring the sound wave velocity for a long time, and synchronously monitoring the reservoir water level to obtain a time-varying curve of the residual error; and S5, when the slope of the residual error changing curve changes suddenly along with the time, an alarm signal is sent out. According to the method, the elastic wave velocity is separated, and the influence of the strain rate effect is filtered out, so that the accurate measurement and monitoring of the beam-direction stress near the foundation surface of the concrete dam are realized.
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