SLOPE STABILIYY ANALYSIS ON OVERALL LOW WALL OF PT XYZ COAL MINE USING THE LIMIT EQUILIBRIUM METHOD

• Main Author: Chlarrizya, Chiara
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/86371
• Institution: Institut Teknologi Bandung

Slope stability is crucial in mining operations. Slope stability analysis aims to determine the safety factor (SF) of a mining slope. This study analyzed the overall low wall slope of PT XYZ’s coal mine using Rocscience Slide2 with water table maximum elevation at RL+32, pore water pressure (Hu) of 1, seismic loading of 0,045 g, and equipment load of 250,92 kN/m2 dan 73,68 kN/m2. The method used to analyze the slope stability is the Bishop limit equilibrium method with a circular failure surface. The slope stability analysis showed a dynamic SF of 0,772, which does not meet the minimum dynamic SF criterion of 1,1. Therefore, three slope stabilization options were developed to meet the minimum dynamic SF, involving changes to slope geometry and lowering the groundwater level with horizontal drain. These options are then economically analyzed to determine the most optimum slope stabilization recommendation. The selected option, recommendation 2, includes slope stabilization through changes in bench width varying from 5 - 20 m, , single slope angles ranging from 25°-35°, flattening the overall slope up to 19°, and lowering the groundwater level by 25 m to the peak elevation of RL+7. The dynamic SF for recommendation 2 is 1,109 with a relative benefit of Rp24.788.245.434,85.