DBPapers
DOI: 10.5593/SGEM2016/B12/S03.053

FIELD TEST RESULTS AND PREREQUISITES FOR METHANE BUILD - UP SIMULATION IN LONGWALL FACE GOAFS

R. Moraru, G. Babut, M.Stelea
Wednesday 7 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-56-8 / ISSN 1314-2704, June 28 - July 6, 2016, Book1 Vol. 2, 405-412 pp

ABSTRACT
The availability of a methane gas accumulation regime forecast model in stopes should be substantiated on proper knowledge of the complex methane build-up process, thus allowing increasingly effective prevention and mitigation of explosion hazards in underground coal mining. Targeting the assessment of methane build-up regime in the goaf of a typical longwall face within a colliery from Jiu Valley coal basin, the paper highlights a systematic measurement campaign which employed purpose designed probe tubes. To establish the function that most closely describes the variation in goaf methane concentrations has been computed the correlation ratio R, as a statistical indicator which shows the degree of correlation between the concentration of methane and the distance between the measuring point and the stope. Based on processing and interpretation of measurements results, it was found that with the stope advancement on direction, methane concentrations slowly increase to reach a peak after which a downward trend is documented. Some mathematical modeling prerequisites are also included, with a view to develop a physical model of the methane build-up process.

Keywords: coal mine, methane inflow, build-up, stope, goaf, correlation factor.