THERMAL SCIENCE

International Scientific Journal

NUMERICAL APPROACH TO THE TOP COAL CAVING PROCESS UNDER DIFFERENT COAL SEAM THICKNESSES

ABSTRACT
Numerical study of mining-induced stress evolution of coal during the top coal caving process under different coal seam thicknesses is carried out, and the numerical prediction agrees well with the field test data. Main characters on stress distribution and dangerous area are elucidated. For the same coal quality, coal layers under 7 m thick fail earlier than thicker coal layers; correspondingly, the internal fracture networks of thin layers are more easily developed. During the mining of a coal layer less than 7 m thick, stress monitoring of the "dangerous area" in the middle of the top coal should be emphasized, whereas during the mining of coal layers less than 11 m thick, stress monitoring of the "dangerous area" at the bottom of the top coal should be highlighted. The research is to optimize caving technique and extraction process.
KEYWORDS
PAPER SUBMITTED: 2014-02-07
PAPER REVISED: 2015-04-10
PAPER ACCEPTED: 2015-04-25
PUBLISHED ONLINE: 2015-10-25
DOI REFERENCE: https://doi.org/10.2298/TSCI1504423Y
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2015, VOLUME 19, ISSUE 4, PAGES [1423 - 1428]
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© 2019 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence