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ArticleName Abnormal gas phenomena in coal seams
DOI 10.17580/gzh.2021.12.15
ArticleAuthor Zakharov V. N., Trofimov V. A., Filippov Yu. A., Shlyapin A. V.

Academician Melnikov Research Institute of Comprehensive Exploitation of Mineral Resources—IPKON, Russian Academy of Sciences, Moscow, Russia:

V. N. Zakharov, Director, Professor, Doctor of Engineering Sciences, Corresponding Member of the Russian Academy of Sciences
V. A. Trofimov, Head of Laboratory, Chief Researcher, Doctor of Engineering Sciences,
Yu. A. Filippov, Senior Researcher, Candidate of Engineering Sciences
A. V. Shlyapin, Deputy Director, Candidate of Engineering Sciences


The problem connected with methane emission in metallic and nonmetallic mines becomes highly pressing today in view of the current surge in the mining industry. Gas emissions are often observed even in ore mines, let along coal mining where the gas criterion is the determinant of operational safety. The mechanisms and patterns of mass transfer greatly depend on the structure and properties of enclosing rock mass, as well as on the configuration of mined-out area and certain mining systems. The article presents the numerical analysis of time history of gas pressure in coal seams. The time response characteristics of gas mass transfer are studied and compared, and it is shown that desorption occurs at higher intensity than absorption, other things being equal. The conditions of abnormal absorption are found, when a naturally permeable area in a coal seam becomes impermeable, which limits gas mass transfer. The applicability of the proposed approach in interpretation of laboratory test data on permeability is illustrated. The implemented numerical modeling in combination with the experimental data have revealed some specific features of methane flow in coal, connected with cyclic gas sorption–desorption.
The study was supported by the Ministry of Science and Higher Education of the Russian Federation, Agreement No. 075-15-2021-943, and by the European Commission Research Fund for Coal and Steel (RFCS, Project: Advanced methane drainage strategy employing underground directional drilling technology for major risk prevention and greenhouse gases emission mitigation GA: 847338—DD-MET—RFCS-2018/RFCS-2018.

keywords Coal, methane, gas abnormality, gas flow, finite difference scheme, permeability, absorbed gas, gas pressure

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