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The experimental research on response characteristics of coal samples under the uniaxial loading process

  • Acoustics of Structurally Inhomogeneous Solid Media. Geological Acoustics
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Abstract

In order to study the response characteristics of infrasound in coal samples under the uniaxial loading process, coal samples were collected from GengCun mine. Coal rock stress loading device, acoustic emission tested system and infrasound tested system were used to test the infrasonic signal and acoustic emission signal under uniaxial loading process. The tested results were analyzed by the methods of wavelet filter, threshold denoise, time–frequency analysis and so on. The results showed that in the loading process, the change of the infrasonic wave displayed the characteristics of stage, and it could be divided into three stages: initial stage with a certain amount infrasound events, middle stage with few infrasound events, and late stage gradual decrease. It had a good consistency with changing characteristics of acoustic emission. At the same time, the frequency of infrasound was very low. It can propagate over a very long distance with little attenuation, and the characteristics of the infrasound before the destruction of the coal samples were obvious. A method of using the infrasound characteristics to predict the destruction of coal samples was proposed. This is of great significance to guide the prediction of geological hazards in coal mines.

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Correspondence to Jian-Ping Wei.

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Jia, B., Wei, JP., Wen, ZH. et al. The experimental research on response characteristics of coal samples under the uniaxial loading process. Acoust. Phys. 63, 716–722 (2017). https://doi.org/10.1134/S1063771017060057

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  • DOI: https://doi.org/10.1134/S1063771017060057

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