Study on Low-Frequency TEM Effect of Coal during Dynamic Rupture

Dynamic loads provided by the SHPB test system were applied to coal specimens, and the TEM signals that emerged during coal rupture were recorded by the TMVT system. Experiments on coal-mass blasting rupture in excavating workface were also carried out, and the emerged TEM signal was analyzed. The r...

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Bibliographic Details
Published in:Shock and vibration 2015-01, Vol.2015 (2015), p.1-8
Main Authors: Sun, Xiao-yuan, Xie, Bei-jing, Wang, Chuan, Li, Cheng-wu, Xu, Xiao-meng
Format: Article
Language:English
Subjects:
Blast effect
Blasting
Coal
Coal mining
Disasters
Dynamic loads
Dynamical systems
Dynamics
Electromagnetic measurements
Experiments
Load
Measurement
Mechanical properties
Methods
Mining engineering
Rupture
Spectrum analysis
Strain gauges
Studies
Test systems
Transmission electron microscopy
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Summary:Dynamic loads provided by the SHPB test system were applied to coal specimens, and the TEM signals that emerged during coal rupture were recorded by the TMVT system. Experiments on coal-mass blasting rupture in excavating workface were also carried out, and the emerged TEM signal was analyzed. The results indicate that the low-frequency TEM signals were detected close to the coal specimens under high strain dynamic load applied by the SHPB, initially rising sharply and dropping rapidly, followed by a small tailing turbulence. And the field test results obtained during coal blasting process coincided with the results from the SHPB tests. Furthermore, its initial part shaped like a pulse cluster had a more pronounced tail and lasted even longer. And the generation mechanism of the low-frequency TEM effect was analyzed. It suggests that the low-frequency TEM effect of coal during dynamic rupture is contributed by the fractoemission mechanism and the resonance or waveguide effects. Because its wavelength is longer than the higher ones, the low-frequency TEM has a good anti-interference performance. That can expand the scope and performance of the coal-rock dynamic disaster electromagnetic monitoring technique.
ISSN:1070-9622
1875-9203
DOI:10.1155/2015/189569