SLOPE STABILITY ANALYSIS OF PT ABC OPEN PIT COAL MINE IN SOUTH KALIMANTAN

• Main Author: Rinaldi
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/67820
• Institution: Institut Teknologi Bandung

In determining the condition of slope stability, it is necessary to analyze the stability of the slope. The stability analysis methods that are used in this analysis are Safety Factor (SF) and Probability of Failure (PoF). Safety Factor (SF) is a deterministic method that uses the value of the Safety Factor (SF), this method assumes one input parameter as the exact value of all parameters. On the other hand, Probability of Failure (PoF) is a probabilistic stability analysis method that is more systematic in accommodating or accepting uncertainty conditions and provides another alternative to the Safety Factor value approach. The calculation of the probability of failure is carried out by determining the appropriate distribution on the distribution of the data owned by testing the goodness of fit test using the Kolmogorov-Smirnov method and the Akaike Information Criterion (AIC) test on the data that will become input parameters in the modeling and simulation process, namely data cohesion, angle deep friction, and fill weight. The results of the goodness of fit test processing in the form of a distribution function are then used as input parameters in Slide 6.0 software to calculate the value of the Probability of Failure. Stability analysis is carried out by modeling the lowwall & highwall cross-section in each existing section, then simulating it to determine the SF and PoF values for the slope model. The assumptions used are the horizontal seismic loading factor of 0.05g and the ground water level with a hu value of 0.6. The minimum criteria for slope SF and PoF refer to the Kepmen ESDM No. 1827 K/30/MEM/2018 that static SF 1.3; Dynamic SF 1.1; and PoF 5%. From the results of the SF and PoF calculations, it can be concluded that the lowwall slope is stabel or safe and highwall not stabel. Furthermore, there are recommendations for appropriate slope angles from variations in slope height by taking into account the appropriate safety factor. So that PT ABC can apply the recommendation of the slope to the new LOM design.