Browsing by Author "Ayhan, M."

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Determination of Rock Mass Shear Strength Through Back Analysis Method: a Case Study
(Chamber of Mining Engineers of Turkey, 2021) Varol, O.O.; Ayhan, M.; Akın, M.
In 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.
Investigation of Slope Stability of Avnik (Bingöl) Open Pit Iron Mine by Different Methods
(Hacettepe Universitesi Yerbilmleri, 2023) Varol, O.O.; Ayhan, M.; Akin, M.
Avnik iron mine is the most important iron mine in our country, that is located in southeast of Bingöl province. In this study the slope stability of the Avnik iron mine that has a depth of 333 m was examined. In the field works, discontinuity survey was done and discontinuties properties were determined. As a result of the field studies, it was revealed that the metamorphic rocks in the study area have a highly fractured and fissured structure. On the other hand, instabilities with combined failure surfaces developed at two different the open pit mine previously. Corss - sections were taken along the open pit slopes which have critical stability condition and slope stability analyzes were performed on these cross - sections using limit equilibrium and finite element methods for static - dry and dynamic - dry conditions. According to the results of both methods, it wasdetermined that the factor of safety values for the slopes in the north of the open pit decreased in dynamic conditions and approached the critical limit equilibrium state. © 2023, Hacettepe Universitesi Yerbilmleri. All rights reserved.