PROBABILITY OF FAILURE ANALYSIS LOWWALL AND HIGHWALL SLOPE DESIGN OF OPEN PIT COAL MINE PT XYZ

• Main Author: Hizbi Permana, Ahmad
• Format: Final Project
• Language: Indonesia
• Subjects: Pertambangan dan operasi berkaitan
• Online Access: https://digilib.itb.ac.id/gdl/view/51464
• Institution: Institut Teknologi Bandung

PT XYZ, which is an open pit coal mining company, plans to carry out activities to optimize coal reserves. This research was conducted to determine the overall lowwall and highwall slope stability conditions based on the Life of Mine (LOM) design of PT XYZ and to provide recommendations for the overall geotechnically safe slope geometry. In accordance with the Ministerial Decree No. 1827K / 30 / MEM / 2018, slope stability analysis is carried out by calculating the LOM design slope Safety Factor (FK) statically and dynamically and calculating the Slide Probability (PK). PK calculation is preceded by determining the distribution function obtained through processing the goodness of fit test with the Kolmogorov-Smirnov method and the Akaike Information Criterion test on cohesion data, deep friction shocks, and weight content of slope constituent materials. From the results of processing goodness of fit test, the best distribution will be obtained that produces input parameters in the Monte-Carlo simulation method using Slide 6.0 software. The simulation results show thatslope highwall Pit A's with a pore water pressure factor (hu): 0.6 and 0.8 in safe conditions with a slide probability value (PK) of 0% and a dynamic safety factor (FK) value of 1.85 and 1.61, respectively. Slope highwall Pit C with pore pressure factor (hu); 0.6 and 0.8 in a safe condition with a PK value of 0% and a dynamic FK value of 1.95 and 1.68, respectively. Theslopes of lowwall Pit A with hu: 0.6 and 0.8 are in a safe condition with a PK value of 0% and a dynamic FK value of 3.3 and 3.01, respectively. Pit C lowwall slopes with hu: 0.6 and 0.8 are in unsafe conditions with PK values ranging from 6.2% –79.9% and dynamic FK values ranging from 0.93–1.16. From the results above, 2 recommendations for slope design are given by reducing the height of the slope and changing the geometry of a single slope. Obtained on theslopes lowwall pit Cwith hu: 0.6 and 0.8 obtained PK ranging from 0% -0.1% and dynamic FK values ranging from 1.16 to 1.98