Boren;DEMiR Export;et al;metso Expect results;Outotec;TMMOB Maden Muhendisleri Odasi23rd International Mining Congress and Exhibition of Turkey, IMCET 2013 -- 16 April 2013 through 19 April 2013 -- Antalya -- 105453Effective caving of top coal is the most critical factor in maintaining an efficient production in longwall with top coal caving method. During production of the top coal by caving, considerable amount of coal may be left in the goaf and in addition, the produced coal may be diluted with rock, consequently, decreasing the extraction ratio and production efficiency. In this study, numerical studies associated with numerical modelling of Eynez Underground Mine have been carried out. Firstly, the longwall panel was modelled by using a software called FLAC3D, developed based on finite difference technique. Secondary, the induced stresses developing around the longwall face have been determined. Finally, the most critical step of production that is top coal caving through the frames of shields has been modelled. In Eynez Underground Mine, top coal was sufficiently fractured but the marl at the roof was not fractured and there occurred a big opening after caving of top coal. In order to achieve efficient and quick production, the marl must be cracked in as uniformly sized pieces as possible
