Akademik Veri Yönetim Sistemi
Tezin Türü: Yüksek Lisans
Tezin Yürütüldüğü Kurum: Technische Universiaet-Bergakademie Freiberg, Institüt für Geotechnik, Geotechnik, Almanya
Tezin Onay Tarihi: 2022
Tezin Dili: İngilizce
Öğrenci: Irmak Doğan
Danışman: Ahmet Turan Arslan
Özet:
In open pit mining operations, the design of the bench slopes is important for economical, efficient, and safe marble production. High slope benches are useful in terms of production costs, but high slope designs decrease production due to bench slope failure especially in discontinuity planes. Stability of the production marble benches should be controlled in terms of discontinuity planes. In this study, planar slope failure analysis in production bench is made using RocPlane software. Safety factor is calculated by determination of internal friction angle and cohesion of discontinuity planes in production benches with the help of Barton Bandis and Mohr Coulomb equations. Then, failure conditions and applicable solutions are suggested. In the area four main discontinuity sets were found out, 217/63 (J1), 314/69 (J2) and 149/69 (J3) and 79/95 (J4). According to the results of the kinematic analysis made for production bench in the NW-SE direction in the İscehisar marble quarry, planar and wedge failure can occur. Planar failure is controlled by J1 and the wedge failure controlled by (J1-J2), (J1-J3), (J1-J4). Discontinuity planes are classified as moderately and slightly weathered according to field observations. Joint compressive strengths of joint surfaces are calculated as 77.63 MPa for slightly weathered zone and 59.90 MPa for moderately weathered zone using some of the suggested equations in literature, namely Barton Bandis equations. The joint roughness coefficient (JRC) parameters are assumed as 10, 12 and 14 for slightly and moderately weathered zones and the calculations are made separately for these three cases. Factor of safety for planar failure are calculated with both Mohr Coulomb and Barton Bandis criteria under static and dynamic conditions. Factor of safety values for dynamic conditions are all below 1, indicating instability. Furthermore, stability factors for wedge failure are calculated with both Mohr Coulomb and Barton Bandis criteria under static and dynamic conditions. In the light of factor of safety results there is a possibility for wedge failure and planar failure to occur. For this reason, necessary precautions should be taken to avoid long-term risks.