Özet:

In open pit mining from the safety point of view it is very important that physical and mechanicalcharacteristics of the dug-out materials are carefully studied, and geological and geotechnicalcharacteristics should also be considered in planning bench slopes of the dug-out materials. Thepurpose of this study is to work out the stable slope geometry of the eastern permanent slopes inthe Kıfllaköy open pit lignite mine of the Afflin-Elbistan Linyit ‹flletmesi. In the Kıfllaköy open pitmine, 35 geotechnical drillings totalling 3393.20 m were made for the geotechnical studies andto work out slope sizing. A total of 250 vertical electrical drillings (DES) were also made to studytectonic features and lithological changes which do not have surface expressions. All these datahave been used in this study. Design analyses showed that black coloured clay bands with highplasticity present in between lignite horizon is the most important unit controlling slope stability.Slope stability analyses have in general been conducted using the ‘finite elements’ and the ‘limitequilibrium’ method to suit block sliding model and to suit different groundwater conditions. Inthe analyses for the stresses affecting the slices; central part of the slice has been taken as a baseand the ‘finite elements’ stability studies have been conducted then the findings have beencompared. According to this it is understood that if stresses affecting the slices are conducted bythe ‘finite elements’ method then calculated factor of safety on the bench base would be morefrom 1% to 7%, and in the slope angles it would be more from 1% to 23%.1. Girifl

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