Importance of the investigation of slope stability for spoil piles under static conditions: A case from yayli{dotless}ktepe site,yeniköy lignite enterprises [Pasa yi{dotless}ǧi{dotless}nlari{dotless} için statik ko ş ullarda şev durayli{dotless}li{dotless}ǧi{dotless}ni{dotless}n araşti{dotless}ri{dotless}lmasi{dotless}ni{dotless}n önemi: Yeniköy linyitleri i̇letmesi yayli{dotless}ktepe sahasi{dotless} örneǧi]

The studies related the deposition of the spoil piles,which is obtained by mining excavation in open pit mines,and the reclamation of the depositional areas are very important to overcome the induced destruction of the nature. a signifcant part of these studies is the investigation of the slope stability of spoil piles. in this study,slope stability analyses have been performed for the spoil piles of the sekköy open pit mine in muǧla-milas. experimental results indicated that the spoil material includes nearly equal amount of coarse and fne grains,and has low plasticity index. with the purpose of determining the mobilized shear strength parameters at the time of failure,back analyses have been performed for the spoil pile failures observed in the study area. the comparison of data from the back analyses and the laboratory tests reveals that residual strength values were mobilized at the time of failure for the spoil material. by considering the data obtained and the feld observations,one and multi-bench economical and safe slope design analyses have been performed for the spoil piles in the study area in accordance with the rules in the regulation on reclamation of the sites destructed by mining applications. according to the results of the analyses for 10,20 and 30 m slope heights,20-40° and 19° overall slope angle values were determined for one and multi-bench slopes,respectively.