ANALYSIS OF COAL MINING OPERATIONAL SLOPE STABILITY BASED ON PT XYZ'S LIFE OF MINE (LOM) DESIGN, EAST KALIMANTAN
PT XYZ is a coal mining company located in East Kalimantan. Currently, PT XYZ intends to expand its mining area to maximize reserve extraction, so a Life of Mine (LOM) design for a new pit at PT XYZ has been developed. However, the safety of the LOM design has not yet been tested from a geotechni...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/85129 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | PT XYZ is a coal mining company located in East Kalimantan. Currently, PT XYZ intends to
expand its mining area to maximize reserve extraction, so a Life of Mine (LOM) design for a
new pit at PT XYZ has been developed. However, the safety of the LOM design has not yet been
tested from a geotechnical perspective. The slopes in the LOM design consist of low walls, high
walls, side walls, and waste dumps. Five cross-sections of the LOM design were then created
for slope stability analysis by first correlating the existing lithological layers with the borehole
log data available around these five cross-sections. Slope stability analysis needs to be carried
out by determining the Factor of Safety (FoS) both statically and dynamically, as well as the
Probability of Failure (PoF) values, which comply with the minimum standards based on
Ministerial Regulation of Energy and Mineral Resources No. 1827 K/30/MEM/2018. The slope
stability analysis was conducted using Slide2 software, where the low wall calculations were
performed using the Janbu method, and the other slope calculations were performed using the
Bishop method. The material properties used for the FoS calculations were obtained from lab
test data on samples taken from geotechnical drilling with a loading factor of 0.05 g. For the
PoF calculations, the lab test data were first processed using the Kolmogorov-Smirnov method
for normality testing. Based on the analysis results, out of the five cross-sections in the LOM
design, it was concluded that one cross-section (low wall) is unsafe, while the remaining four
cross-sections are safe according to the applicable regulations. Therefore, the LOM low wall
section needs to be redesigned with a single slope height of 12.5 meters, a bench width of 20
meters, and a slope angle of 23°. |
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