Ultimate length and capacity of production heading with regard to gas content, considering nonuniform air flow

Procedures for calculating permissible length and capacity of a fully mechanized production heading with regard to gas content and considering nonuniform air flow across and along longwall are described. Nonlinear relations are derived for methane concentrations and air leakage into mined-out area....

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Bibliographic Details
Published in:Journal of mining science 2015-07, Vol.51 (4), p.771-778
Main Authors: Ordin, A. A., Timoshenko, A. M., Kolenchuk, S. A.
Format: Article
Language:English
Subjects:
Air flow
Coal
Coal industry
Cutting
Earth and Environmental Science
Earth Sciences
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Leakage
Longwall
Mathematical analysis
Methane
Mineral Mining Technology
Mineral Resources
Natural gas
Nonuniform
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Summary:Procedures for calculating permissible length and capacity of a fully mechanized production heading with regard to gas content and considering nonuniform air flow across and along longwall are described. Nonlinear relations are derived for methane concentrations and air leakage into mined-out area. It is proposed to assess a production heading capacity based on the gas-related permissible length of the heading and the coal cutting chart with a shearer. It is found that the increased gas content of coal and higher air leakage into mined-out area results in reduction of gas-related length and capacity of production headings.
ISSN:1062-7391
1573-8736
DOI:10.1134/S1062739115040140