Research of vitrinite and fusinite coals for predicting geological hazards in coal seams

Abstract

To establish the necessity of dividing fossil coals into vitrinitic and fusinitic varieties in order to identify the hazardous properties of coal seams during mining. Methodology. The study of changes in conditional indices in the general ranking series was carried out according to DSTU 25543-2013 separately for the classification indicators of vitrinite and fusinite coals, as well as coal groups not assigned to the considered varieties. Changes in indices in the ranks of classification indicators allow us to identify the distinctive or unifying features of the construction of these series and provide suggestions for improving the regulatory documents of mining operations. Outcome. The safety of mining in Ukrainian coal mines is regulated by a number of regulatory documents that are based on genetic classification indicators of coal. One of the decisive factors of dividing coals by technological properties is their classification as vitrinitic or fusinitic, which is not taken into account by the regulatory framework when establishing the hazardous properties of coal seams. The analysis of distinctive properties acquired in the process of metamorphic transformations between vitrinite and fusinite coals has been carried out. It is established that the correlation indices (R2) of the relationship between conditional indexes of Ro, Vdaf and у ranking series with the conditional indices of the general ranking series by brand of coal are practically the same. In terms of Ro, the values of R2 for vitrinitic and fusinite coals were 0,9114 and 0,9221, respectively. Similar results were obtained for the Vdaf indicator, according to which it is impossible to establish differences in the degree of metamorphic transformations between vitrinite and fusinite coals. The characterizing values of the у indicator do not make it possible to establish the direction of change in the properties of coal. The used values of this indicator have a large scatter in the compilation of coal ranking. Scientific novelty. The nature of change in the classification indicators of industrial classification of coal for identifying the hazardous properties of coal seams in mining operations has been identified. Practical relevance. The possibility of improving the regulatory framework for safe mining of coal seams by establishing differences in the properties of vitrinite and fusinite coals.

Keywords

• coal
• metamorphism
• endogenous fire
• spontaneous combustion
• geological and genetic factors