Experimental Study on Spectrum Characteristic of AE during Brittle Rock Fracture under Uniaxial Compression Based on Welch

Xian Zhen Wu; Jian Wei Liu; Hong Xing Liu; Xiang Xin Liu

doi:10.4028/www.scientific.net/AMR.734-737.751

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 734-737Experimental Study on Spectrum Characteristic of...

Experimental Study on Spectrum Characteristic of AE during Brittle Rock Fracture under Uniaxial Compression Based on Welch

Abstract:

Acoustic emission (AE) phenomenon will occur during the production and propagation of internal cracks, and failure in brittle rock. Under uniaxial loading, the complete stress-strain curves and waveform data were obtained. The Welch spectrum estimation and Cubic spline interpolation method were used to analyze the evolution of F, R values (peak frequency, energy percentage) of AE. The results show that F-values are maintained at 100±20kHz, and the peak points of F and R above 25% which can be used as a precursor to rock failure that their waveform are burst-type. The combined analysis of stress and F, R supplies a more accurately method of predicting the occurrence of rock burst.