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| Titel |
Spatiotemporal multifractal characteristics of electromagnetic radiation in response to deep coal rock bursts |
| VerfasserIn |
S. Hu, E. Wang, X. Liu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 14, no. 8 ; Nr. 14, no. 8 (2014-08-15), S.2089-2103 |
| Datensatznummer |
250118599
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| Publikation (Nr.) |
 copernicus.org/nhess-14-2089-2014.pdf |
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| Zusammenfassung |
| Dynamic collapses of deeply mined coal rocks are severe
threats to miners; in order to predict collapses more accurately using
electromagnetic radiation (EMR), we investigate the spatiotemporal
multifractal characteristics and formation mechanism of EMR induced by
underground coal mining. Coal rock in the burst-prone zone often exchanges
materials (gas, water and coal) and energy with its environment and
gradually transitions from its original stable equilibrium structure to a
nonequilibrium dissipative structure with implicit spatiotemporal
complexity or multifractal structures, resulting in temporal variation in
multifractal EMR. The inherent law of EMR time series during damage
evolution was analyzed by using time-varying multifractal theory. Results
show that the time-varying multifractal characteristics of EMR are
determined by damage evolution processes. Moreover, the dissipated energy caused by
the damage evolutions, such as crack propagation, fractal sliding and
shearing, can be regarded as the fingerprint of various EMR micro-mechanics.
The dynamic spatiotemporal multifractal spectrum of EMR considers both spatial
(multiple fractures) and temporal (dynamic evolution) characteristics of
coal rocks and records the dynamic evolution processes of rock bursts.
Thus, it can be used to evaluate the coal deformation and fracture process.
The study is of significance for us to understand the EMR mechanism in detail and
to increase the accuracy of the EMR method in forecasting dynamic disasters. |
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