Probabilistic Analysis of The Stability of Open Pit Mine Slopes Using The Two Dimensional Limit Equilibrium Method In PT. Makmur Lestari Primatama, Langgikima District, North Konawe Regency, Southeast Sulawesi
Masagus Ahmad Azizi, Yuga Maulana, dan Kristian Bentus Karya

Trisakti University

Abstract

The Open Pit mine method is often faced with the problem of determining a safe slope geometry for mining activities. Therefore, it is necessary to carry out a slope stability analysis by comparing the results of the analysis of the Factor of Safety (FK) and the Probability of Slide (PK) using the 2D method through the Slide6 software. In this study will use the Limit Equilibrium Method. On the existing single excavation slope with slope geometry: height 5 m, width of berm 5 m, and slope angle of 26 obtained FK more than 1.2 and PK are 0 in saturated condition. So that for a single embankment slope this can be optimized with the geometry ofthe slope: a height of 5 m, a width of 5 m of berm, and a slope angle of 45, the values of FK are 1,301 and PK are 1.4. The existing excavation slopes have been stable with an FK value of 1,261. And the results ofthe optimized embankment slope geometry have been stable with an FK value of 1,301 pit areas which are within the IUP area of PT. MLP has the potential for landslides due to the actual conditions not matching the existing designs.

Keywords: Slope Geometry, Factor of Safety, Limit Equilibrium Method, 2D analysis

Topic: Hydrology, hydrogeology, and geology engineering