MICROSTRUCTURE OF COAL BEFORE AND AFTER GAS-DYNAMIC PHENOMENA
E. V. Ul’yanova1, O. N. Malinnikova1, B. N. Pashichev1, E. V. Malinnikova2
1Academician Melnikov Research Institute of Comprehensive Exploitation of Mineral Resources, Russian Academy of Sciences, Moscow, 111020 Russia
2Moscow State University of Geodesy and Cartography, Moscow, 107064 Russia
Keywords: Ископаемый уголь, газодинамические явления, выбросоопасные и невыбросоопасные зоны, цифровые изображения поверхности углей, статистические энтропия и сложность, Coal, gas-dynamic phenomena, outburst-hazardous and outburst-nonhazardous zones, digital images of coal surface, statistical entropy and complexity
Abstract
The applicability of calculated information entropy to quantification of coal structure nonuniformity at a microlevel is demonstrated. The calculations used digital images of coal surface from scanning electron microscopy after thousandfold increase. The calculated statistical entropy-complexity values enable comparing structural nonuniformity of coal sampled from outbursts, as well as from outburst-hazardous and outburst-nonhazardous zones. It is found that coal from outburst-hazardous zones contain areas of highly chaotic structure as against the ordered structure of coal from outburst-nonhazardous zones. Outburst coal is free from chaotic structures though its structure is less ordered than in coal from outburst-nonhazardous zones. The proposed method allows detecting the certainly outburst-nonhazardous zones in coal seams using digital images of coal samples.
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