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ArticleName Acoustic emission effects in tension of composites and practical applications for roof control in underground mines
DOI 10.17580/gzh.2019.01.03
ArticleAuthor Nikolenko P. V., Shkuratnik V. L., Chepur M. D.

College of Mining, NUST MISIS, Moscow, Russia:

P. V. Nikolenko, Associate Professor, Candidate of Engineering Sciences,
V. L. Shkuratnik, Professor, Doctor of Engineering Sciences
M. D. Chepur, Student


The authors discuss feasibility of roof control in underground mines with a new method based on effects of acoustic emission in composite materials in deformation and failure. The laboratory research objects were specimens of composites made of epoxy resin with filler represented by aluminum powder or dispersiondistributed carbonic fibers. All specimens were subjected to uniaxial cyclic tension to failure. In the course of loading, activity of acoustic emission and complete wave forms of all emission events were recorded. As a result, it has been found that all specimens show stress memory effect in acoustic emission. The Felicity Ratio is higher in the specimens reinforced with carbonic fibers. In such composites, acoustic-emission strain sensitivity (characterizing interconnection of acoustic emission level and deformation rate of a specimen) is also higher. The analysis of separate acoustic emission signals in the course of brittle failure of specimens shows that such signals essentially differ from background signals, both in amplitude and spectrum composition. This allows distinguishing such signals and locating a fracture to the accuracy up to 5 %. The regularities revealed in the acoustic emission can be the basis for development of methods to control roof conditions in mines. In one of the proposed methods, a sensitive composite element installed in a measurement borehole detects excess of tensile stresses over a preset threshold in roadway roofs. The other method allows locating zones of spalling in roofs. Both methods enable continuous roof monitoring.
This study was supported by the Russian Science Foundation, Project No. 17–77–10009.

keywords Roadway roof, control, acoustic emission, composite materials, tension, safety

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