SLOPE STABILITY ANALYSIS FOR PIT, WASTEDUMP, AND QUARRY ON OPEN PIT NICKEL MINE PT XYZ WITH BISHOP SIMPLIFIED METHOD AND KINEMATIC ANALYSIS

• Main Author: Joe, Jason
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/76035
• Institution: Institut Teknologi Bandung

PT. XYZ is a nickel ore mining company located in Konawe regency, Southeast Sulawesi, who wants to know the recommendations of safe slope geometry for single and overall slopes at the end of the mine, both for pit, wastedump, and quarry. Therefore, studies related to the geometry of slopes are formed to determine whether the previously designed slopes are safe or not. If not, then recommendations will be made in according to the established rules. In Factor of Saftey analysis, the analysis used Limit Equilibrium Analysis with Bishop Simplified Method. The input parameters to used this analysis were cohesion, friction angle, and unit weight which obtained from the nearest geotechnical borehole data. Landslide Probability Analysis uses randomly generated material characteristics with Monte Carlo simulation using Slide 6.0 software. Goodness of Fit Test is conducted to determine the best distribution using Kolmogorov-Smirnov and AIC method on cohesion, friction angle, and unit weight of slope materials. Kinematic Analysis on quarry slope is done with Dips 6.0 software. The data used are scanline results and the general direction of shear. Then there are four control parameters, which are Slope Dip, Slope Dip Direction, Friction Angle, and Lateral Limit. From the analysis results, the recommendation of single slope geometry of limonite, saprolite, and bedrock is 5 meters high with an angle of 45°. On the overall slope of the pit, there are several sections that have Factor of Safety and Probability of Failure that under the regulations, namely section 1-5, section 7-15, section 17-22, section 25-26, and section 30-35. After the recommendation, all Factor of Safety and Probability of Failure are in accordance with the rules. For wastedump’s single slope, the recommendation is 5 meter high with 25° angle. For overall slope in wastedump and quarry slopes, recommendations are not needed because there is no possibility of circular failure for wasteddump, and wedge, or plane failure in quarry.