Acoustic Emission Waveform Analysis of Sandstone Failure with Different Water Content

Previous studies have shown that water can reduce the acoustic emission (AE) energy and other parameters during rock failure. However, the fracture mechanism of rock can be better reflected by analyzing the AE waveform. Therefore, this paper conducted experiments of uniaxial compression on sandstone...

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Bibliographic Details
Published in:Geofluids 2021-08, Vol.2021, p.1-10
Main Authors: Li, Hongru, He, Manchao, Shen, Rongxi, Xiao, Yingming, Cheng, Tai
Format: Article
Language:English
Subjects:
Acoustic emission
Acoustic emission testing
Analysis
Compression
Crack propagation
Emission analysis
Emissions control
Energy
Energy dissipation
Experiments
Failure analysis
Fast Fourier transformations
Fourier analysis
Fourier transforms
Fracture mechanics
Frequency analysis
Hilbert transformation
Moisture content
Rockbursts
Rocks
Sandstone
Sedimentary rocks
Stress-strain curves
Water content
Waveform analysis
Waveforms
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Summary:Previous studies have shown that water can reduce the acoustic emission (AE) energy and other parameters during rock failure. However, the fracture mechanism of rock can be better reflected by analyzing the AE waveform. Therefore, this paper conducted experiments of uniaxial compression on sandstone samples of various water contents and collected AE signals simultaneously. Analyses of fast Fourier transform (FFT) and Hilbert-Huang transform (HHT) were performed on the AE waveform when the sample failed. The results show that as the water content increases, the frequency and intensity of the AE signal will decrease. The influence of water on the intensity of the AE signal is greater than that on the frequency. Through the analysis of the energy mechanism of rock failure, it is pointed out that the frequency and intensity of AE signal are closely related to elastic energy index WET and burst energy index KE. The research results have guiding significance for the monitoring of rockburst.
ISSN:1468-8115
1468-8123
DOI:10.1155/2021/5290076