Acoustic Emission Analysis in Rock and Coal Mechanics
Summary
Acoustic emission (AE) analysis has become an indispensable tool for probing the micro-mechanisms of deformation and failure in rock and coal masses. By recording transient elastic waves generated by rapid stress redistributions, AE monitoring reveals the nucleation, propagation and coalescence of micro-cracks long before macroscopic rupture. Key signal parameters – including amplitude, frequency content, energy release and inter-event time intervals – are used to characterise damage evolution under diverse loading paths such as uniaxial compression, direct shear and cyclic fatigue. Advanced processing methods, from moment-tensor inversion to fractal and time-frequency analysis, permit discrimination between tensile and shear sources, localisation of hypocentres, estimation of source dimensions and quantification of damage precursors through the b value and related scaling laws. These developments have strengthened predictive capabilities for rockburst, coal–gas outburst and slope instability, with implications for mining safety, underground construction and geotechnical hazard mitigation. Challenges remain in accounting for attenuation, noise filtering and scaling from laboratory specimens to field sites, but integration with numerical modelling and real-time decision support is rapidly maturing.
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Acoustic Emission Analysis in Rock and Coal Mechanics publication trend
The graph below shows the total number of articles in acoustic emission analysis in rock and coal mechanics across all publications each year (not limited to Nature Index journals).
Technical terms
Acoustic emission (AE): Transient elastic waves generated by rapid energy release during micro-fracturing in materials.
b value: A scaling exponent in the Gutenberg–Richter relationship for AE event size distribution, used as a precursor of instability.
Moment tensor: A mathematical representation of the source mechanism of an AE event, resolving tensile versus shear components.
Fractal dimension: A measure of spatial complexity in AE hypocentre distributions, reflecting evolving damage patterns.
References
- Master crack types and typical acoustic emission characteristics during rock failure. International Journal of Coal Science & Technology (2023).
- Fracture features of brittle coal under uniaxial and cyclic compression loads. International Journal of Coal Science & Technology (2023).
- Acoustic Emission b Value Characteristics of Granite under True Triaxial Stress. Mathematics (2022).
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