Journal
JOURNAL OF MINING SCIENCE
Volume 52, Issue 5, Pages 873-877Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S1062739116041322
Keywords
Black coal; elastic waves; specimen; laboratory test; ultrasound; one-and bi-axial loading; Kuznetsk Coal Basin
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Funding
- Russian Science Foundation [16-17-00029]
- Russian Science Foundation [16-17-00029] Funding Source: Russian Science Foundation
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Experiments allowed finding regular patterns in propagation of elastic P-waves in specimens of black coal exposed to uniaxial compression and triaxial compression by von Karman. It is shown that in case of uniaxial compression, the largest information content is ensured by translucence in perpendicular to bedding and loading axis of coal specimens. Such translucence exhibits four stages of deformation of a specimen. The information content of translucence under triaxial compression reduces with the increase in the constrained pressure that prevents from disintegration of a coal specimen. Four deformation stages are best identified with the constrained pressure of 2.5 MPa, while only stages of specimen consolidation and failure are traced at the pressure of 10 MPa.
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