Varol, O.O.Ayhan, M.Akın, M.2025-05-102025-05-1020212564-702410.30797/madencilik.8905862-s2.0-85122729808https://doi.org/10.30797/madencilik.890586https://hdl.handle.net/20.500.14720/2935In this study, the slope failures were investigated in Avnik (Bingöl) iron open – pit mine. The slope instabilities occurred in highly weathered phyllite and schist units. The back analyses were carried out considering the limit equilibrium method and the shear strength parameters. While determining shear strength parameters via limit equilibrium method Hoek – Brown failure criterion was used. The GSI values (35 – 32) obtained by back analyses and GSI values (41 – 35) determined by field survey are compatible with each other. Hoek – Brown parameters for phyllite and schist units, which were obtained by back analyses are mb: 0.147 and 0.173, s: 3.305x10-5 and 8.,566x10-5, a: 0.516 and 0.511 respectively. © 2021 Union of Chambers of Engineers and Architects of Turkey. All rights reserved.trinfo:eu-repo/semantics/openAccessBack AnalysisHoek – Brown Failure CriterionLimit Equilibrium MethodOpen PitSlope StabilityArticle603N/AQ4137145508704