The study of acoustic emission (AE) forecasting coal and rock disaster technique

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.