LOW WALL SLOPE STABILITY ANALYSIS OF PT XYZ’S OPEN PIT COAL MINE IN EAST KALIMANTAN

• Main Author: Maharany, Saumi
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/83479
• Institution: Institut Teknologi Bandung

Slope stability analysis aims to produce a factor of safety (FoS) value that is in accordance with the Decree of the Minister of Energy and Mineral Resources Number 1827 K/30/MEM/2018. This final project research analyzes the stability of low wall slopes in the southeast part of pit A PT XYZ in East Kalimantan, using Rocscience Slide2 software with full saturated groundwater table conditions, pore pressure (Hu) of 1, and seismic loading of 0.05g. The analysis method used is the limit equilibrium method with two types of slope slidings, namely circular (Bishop method) and non-circular (Janbu method) slidings. The minimum criteria for FoS and PoF of slopes refer to the Decree of the Minister of Energy and Mineral Resources Number 1827 K/30/MEM/2018, namely static FoS ? 1.3; dynamic FoS ? 1.1; and PoF ? 5%. From the results of the FoS and PoF calculations on the LOM design of the pit A low wall slope, the static and dynamic FoS values are 1.130 (0%) and 1.016 (48%) which are not safe according to the minimum criteria. So that the slope geometry recommendations are given with a slope slope to 20° which was originally 28°, required widening the level which was originally 3 meters and 5 meters to 10 meters and 24 meters, and widens the angle of the single slope which was originally 35° to 30°. Then, the static and dynamic FoS values and PoF values were obtained in the range of 1.192 (0%) - 3.717 (0%).