Title: Safety pillar design for main galleries in multi-slice longwall top coal caving method

Authors: Cemalettin Okay Aksoy; Kerim Kucuk; Güzin Gülsev Uyar

Addresses: Department of Mining Engineering, Engineering Faculty, Dokuz Eylul University, 35160, İzmir, Turkey ' Department of Mining Engineering, Engineering Faculty, Dokuz Eylul University, 35160, İzmir, Turkey ' Department of Mining Engineering, Engineering Faculty, Hacettepe University, Ankara-Turkey

Abstract: Longwall top coal caving (LTCC) is one of the methods used in thick coal seams. In coal mines where this method is used, some coal is left in place to be retrieved later in order to prevent damage to the main galleries. Stresses and strains created by roof layer caving of the panels advancing towards each other may put pressure on the main galleries. The amount of this pressure increases with time-dependent consolidation of roof layers. Sizes of the safety pillars gain importance in order to prevent this pressure and thus avoid the damages on the supports of the main galleries. In this research, great deformations creating damages on the supports of the main galleries of an underground coal mines in Manisa, Soma-Eynez were examined. Time-dependent deformation amounts were investigated both in situ and with time-dependent numerical modelling analysis. The results obtained by this research provide the sizes of the safety pillars in the panels to be produced. [Received: September 24, 2014; Accepted: December 25, 2014]

Keywords: longwall top coal caving; LTCC; time-dependent numerical modelling; safety pillars; safety pillar design; main galleries; thick coal seams; stress; strain; roof layer caving; coal mines; mining industry; Turkey.

DOI: 10.1504/IJOGCT.2015.069029

International Journal of Oil, Gas and Coal Technology, 2015 Vol.9 No.3, pp.329 - 347

Received: 25 Sep 2014
Accepted: 25 Dec 2014
Published online: 24 Apr 2015 *

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