Characteristics of Acoustic Emission Signals Induced by Seepage Process in Porous Media
Without destroying the structure,the acoustic emission(AE)monitoring technology was used to explore the motion law of gap grading particle media at different flow rates,and to reveal the characteristic law of acoustic emission signals in the process of pore seepage.The analysis was carried out by combining the acoustic emission signal generated by the displacement of the small particle medium during the seepage process with the PIV technique.The results show that:when the number of small-particle media is constant,the experimental group with higher flow velocity has more AE events,that is,the ringing count is larger and the spectrum center of gravity is higher,when the water flow rate is similar,the content of small-particle media in the experiment directly affects the number of AE events.That is,the experimental group with larger sand content has more AE events;in the case of medium with small particles,the larger the water flow rate,the faster the particle movement speed and the greater the initial signal intensity of AE.The above studies show that the acoustic emission detection techn ology can better reflect the movement of granular media in pore seepage,and provide a certain research basis for small particle transport mo-nitoring and dam piping early warning in the process of pore media seepage.
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