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DOI

10.19111/bmre.17898

Abstract

In open pit mining from the safety point of view it is very important that physical and mechanical
characteristics of the dug-out materials are carefully studied, and geological and geotechnical
characteristics should also be considered in planning bench slopes of the dug-out materials. The
purpose of this study is to work out the stable slope geometry of the eastern permanent slopes in
the K›fllaköy open pit lignite mine of the Afflin-Elbistan Linyit ‹flletmesi. In the K›fllaköy open pit
mine, 35 geotechnical drillings totalling 3393.20 m were made for the geotechnical studies and
to work out slope sizing. A total of 250 vertical electrical drillings (DES) were also made to study
tectonic features and lithological changes which do not have surface expressions. All these data
have been used in this study. Design analyses showed that black coloured clay bands with high
plasticity 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 ‘limit
equilibrium’ method to suit block sliding model and to suit different groundwater conditions. In
the analyses for the stresses affecting the slices; central part of the slice has been taken as a base
and the ‘finite elements’ stability studies have been conducted then the findings have been
compared. According to this it is understood that if stresses affecting the slices are conducted by
the ‘finite elements’ method then calculated factor of safety on the bench base would be more
from 1% to 7%, and in the slope angles it would be more from 1% to 23%.

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