The study of acoustic emission (AE) forecasting coal and rock disaster technique |
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摘 要: |
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关 键 词: | 声发射传感器 煤岩 AE 灾害 预测 传播距离 波导传播 技术 |
收稿时间: | 29 January 2008 |
The study of acoustic emission (AE) forecasting coal and rock disaster technique |
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Authors: | Yin-hui Zou |
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Affiliation: | Chongqing Research Institute, China Coal Research Institute, Chongqing 400037, China |
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Abstract: | Introduced the coal and rock AE propagation rule, wave guide fixing technics on AE sensors, and AE forecasting coal and rock
disaster on the scene and so on. The coal and rock AE propagation rule that follows the exponent attenuation function on different
AE frequencies, different quality factors and different propagation distances were analyzed and deduced by theory, numerical
simulation, and by actual experiment. Consequently, it was deduced that the coal and rock AE propagation rule follows the
exponent attenuation function. Based on the correlative theory of wave dynamics and AE sensor, the AE wave guide propagation
mechanical model on the sensor fixing manner is found, and the relations of displacement and speed and acceleration between
the AE signal source and the AE signal receiving terminal are presented. The effect of the AE sensor fixing manners on coal
and rock surfaces, coal and rock bottoms and wave guides were studied by actual experiment. For the results, the effect of
the AE sensor fixing manner on wave guides is better than on coal and rock surfaces, and was equivalent to the fixing manner
on coal and rock bottoms. Based on the above study results, actual coal and rock dynamistic disasters were successfully forecasted.
Supported by the Project of National Basic Research Program of China (973 Program) (2005CB221505); the Significant Project
of National Natural Science Fund (50534080/E041503); the Project of Coal Mine Gas and Fire Hazard Prevention Major Lab in
Henan Province (HKLGF200508) |
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Keywords: | acoustic emission coal and rock body propagation laws wave guide installation technique coal and rock dynamic disasters |
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