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Unformatted text preview: and one bedding plane. Second step was laboratory tests and determining groundwater condition that can be used to obtain the RMR parameters values. ±e UCS (uncon²ned compressive strength of intact rock material) of dolomite specimens is determined with uniaxial compressive strength laboratory tests. Finally, the classi²cation of rock mass, description of classes, probability of failures and suggested support methods are determined according SMR values in two critical sections, southern west and southern east walls with total height of 155 meters, and two failure conditions, plane and toppling failure. Final results describe the hazard of big planar or soil-like failures, in both critical sections. It seems that Re-excavation on current 73 meters slopes must be applied, for stability of 155 meters height of pit limit southern wall. Keywords: Slope stability, Jajarm bauxite mine, rock classi²cation systems....
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- Spring '11