SLOPE STABILITY ANALYSIS ON WASTE DUMP DESIGN OF COAL MINING IN PT XYZ CENTRAL KALIMANTAN PROVINCE USING LIMIT EQUILIBRIUM METHOD

• Main Author: Prameswari, Indyra
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/40250
• Institution: Institut Teknologi Bandung

PT XYZ is a coal mining that produce high rank coal that located in Central Kalimantan Province and construct rejects material from the Coal Processing Plant to a mine waste dump. reject materials are classified to a rock fill and consist of mudstone and sorted based on the fragment size and the percentage of rock fill. The mechanical parameters of the reject materials are obtained from laboratory test and calculated into Barton and Kjaernsli critera. Slope stability analysis is carried out with limit equilibrium method using Janbu Method with the help of Rocscience’s Slide 6.009. Waste dump that has been analyzed consist of two topography conditions, flat topography and topography with angle 80. Then, safety factor (FS) of the slope is computed and the slope with FS more than one is considered stable or safe while FS less than one is considered unstable or unsafe. The slope stability modeling, consist of twenty-four slope models, showed that the higher the percentage of large fragment size from waste dump material will increase the value of equivalent roughness (R) thus increases the value of safety factor (FS). The modeling results also showed all slopes are stable or safe as the result of safety factor are more than one. Therefore, it is recommended to increase the height of the slope or the overall slope angle thus reduce the dumping area.