DBPapers
DOI: 10.5593/SGEM2015/B13/S3.045

GOB METHANE ACCUMULATION AND TRANSIENT GAS OCCURRENCES IN LONGWALL COAL FACES

R.I. Moraru, G.B. Babut, M. Popescu-Stelea
Friday 7 August 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-33-9 / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 3, 345-352 pp

ABSTRACT
Gob methane migration towards working face is determined by several factors, such as mine pressure, supporting system, airflow through the gob, barometric pressure variation and pressure differences between intake and return air streams along the working face. For the specific conditions met in Jiu Valley coal basin there were initiated a number of research that attempts to elucidate the regime of methane accumulation in the caved gob and establishing methods to prevent and combat the threat raised by methane in the gob of longwall faces. For advancing longwall panel mining methods applied in the Jiu Valley, isolines of methane and oxygen concentrations in the caved gob were drawn, and a case study in the longwall stope panel 3-4, seam 3, block VI A from Livezeni Colliery was performed. There were taken into consideration four types of functions and, based on processing of the measurement results it was found that along with stope line advancement on direction, the methane concentrations are slowly growing until they reach a peak value, having a downward trend afterwards.

Keywords: colliery, methane, gob, accumulation, irregular, flow, retreating, longwall