SLOPE STABILITY ANALYSIS ON THE DESIGN OF THE FINAL SLOPE DESIGN, PT XYZ NICKEL MINE IN EAST HALMAHERA, NORTH MALUKU

• Main Author: Tathira, Alya
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/40383
• Institution: Institut Teknologi Bandung

PT XYZ is a nickel mining company located in East Halmahera, North Maluku. PT XYZ is optimizing reserves in the mining business permit area. PT XYZ is conducting a geotechnical analysis to determine the optimum and safe final mine slope geometry for its mining operations in determining the technical and economic studies of the mining plan. In addition, the calculation of maximum displacement is needed so that the slope remains in a safe condition. The parameters used when analyzing include cohesion, friction angle, unit weight, Young’s modulus, and Poisson’s ratio. The slopes that have been modeled using Slide Software 6.0 and AutoCad, analyzed its stability using the Software Slide 6.0 with the boundary equilibrium method of Bishop and Phase2 with the element method up to. The result of slope stability analysis is a security factor value (FK) and a strength reduction factor (SRF) value. If there is an unsafe slope it is given a safe slope geometry recommendation. Furthermore, the total calculation of displacement on the surface of slope for the geometry of slopes that have been safely done using Phase2 software. The results of the analysis of single slope stability for saprolite and limonite lithology showed that the slope would be safe (SF static ?1,1) on the recommendation of the slope geometry with a height of 3 m and a slope angle of 60°. For bedrock lithology, the SRF static value ? 1,1 value is found in all variations of the slope geometry so that it can be said to be safe. The results of the overall slope stability analysis indicate that the overall slope section 2, section 3, and section 4 are in an unsafe condition because it has the SRF dynamic value < 1,1, so it is necessary to change the slope geometry so that the slope is safe. The displacement values on the single slope of saprolite and limonite lithology on the geometry of the slope with a height of 3 m and a slope angle of 60° with range 0,07 m – 0,28 m. The displacement value on the single slope of bedrock lithology is 0.0002 m on the slope geometry with a height of 6 m and a slope angle of 70°. The displacement value on the overall slope is calculated on each lithology forming the slope surface with range 0,03 m – 0,79 m.