BACK ANALYSIS OF LANDSLIDE AT INPIT DUMP AREA OF BERAMBAI COAL MINING, KUTAI KARTANEGARA REGENCY, EAST KALIMANTAN
Insani Bara Perkasa is a significant open-pit mining operation located at Berambai, East Kalimantan, encompassing a total area of 23.668 hectares, divided into several mining blocks. Two of these blocks are known as the Mahakam and Separi Blocks. This research is conducted at inpit dump (IPD) P...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/79354 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Insani Bara Perkasa is a significant open-pit mining operation located at
Berambai, East Kalimantan, encompassing a total area of 23.668 hectares, divided
into several mining blocks. Two of these blocks are known as the Mahakam and
Separi Blocks. This research is conducted at inpit dump (IPD) Pit 2 area of Separi
Block. This area experienced a continuous landslide during an inpit dump activity
in Pit 2. The disposal known can hold as much as 4 Mio LCM of overburden. The
consequences of this landslide have been significant, resulting in restricted access
to the affected area, and the pit has not reached its final design of the coal mining.
In response to this case, a comprehensive study regarding detailed investigation
leading to subsequent back analysis to ascertain the root causes of the landslide
was conducted. The hyphotesis that causes the landslide are influencing of
groundwater. The research methodology employed for the analysis involved the
back analysis using the limit equilibrium method.
Through iterative of varying scenarios to identify the root causes of the landslide,
encompassing combination of distributed load, water level, and seismic, until a
safety factor (SF) ?1,0. Based on the research findings, it is imperative to
underscore a primary determinant contributing of the landslide are (1) noncircular sliding surface with fully saturated watertable added with load of heavy
hauler, and the combination of those two criteria and seismic load. (2) circular
sliding surface with fully saturated watertable combined with load of heavy hauler
and seismic load. The recommended slope stabilization efforts redesign of the inpint
dump geometry with layback and change the slope geometry into height of 37 m
with an overall slope of 8° from its initial geometry (height 42 m with an overall
slope 10°). |
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