slope stability analysis and assessment for further major failure of angooran open-pit mine

slope stability is one of the major and determiner parameters in the economy and safety of open pit mines. failure and consequently rupture of the slope caused no compensable economic and humanity losses. so, probability assessment of the further failure for presentation of damages and additional costs is of prime importance. in this research, stability analysis and probability assessment of the further failure for angooran lead and zinc mine have been investigated. to investigate its geomechanical properties precisely, main joints and available faults were appraised and some samples of the limestone zone of the mine were prepared for rock mechanics tests to determine these properties. after the accomplishment of these tests, the 3ded code was used to construct a three dimensional model. according to the initial displacements from the software and geomechanical properties of the eastern wall and its concave shape, this wall was supposed to be stable. further analyses were focused on the western wall. for stability analysis of the western wall, the model was constructed based on different cohesions and internal friction angles. it was observed that the magnitudes of displacements were higher than in the eastern wall. so, statistical analysis was performed on the toe of the wall and the probability of the failure calculated to 35.2 percent, according to the obtained displacements.