EVALUATION OF NICKEL ORE PILE HEGHTS ON STOCKYARD USING SLOPE STABILITY APPROACH AT PT ANTAM TBK. UBPN KOLAKA
DOI:
https://doi.org/10.52722/dvjx2a10Keywords:
stockyard, nickel ore, slope stability, Limit Equilibrium MethodAbstract
PT ANTAM Tbk. UBPN Kolaka stores nickel ore in stockyard areas with various pile geometries. Variations in pile geometry may affect slope stability and potentially trigger slope failures that could impact occupational safety and operational activities. Therefore, an evaluation of pile geometry is required to determine the level of slope stability and identify a more optimal pile design. This study was conducted on 15 piles in the Pomalaa Domestic Stockyard (SDP) and 15 piles in the Plant Transit Stockyard (TRP). Slope stability was analyzed using the Limit Equilibrium Method (LEM) with the Bishop and Fellenius approaches based on a minimum Factor of Safety (FOS) criterion of 1.1. The results showed that the existing nickel ore piles had heights ranging from 3.93 to 21.39 m, front slope angles of 14.23°–49.54°, and rear slope angles of 34.18°–87.99°. Most piles were classified as stable, with FOS values greater than or equal to 1.1. The highest FOS was obtained for SDP2, with values of 6.168 using the Bishop method and 6.022 using the Fellenius method, while the lowest FOS was obtained for TRP14, with a value of 1.068 using the Bishop method and 1.057 using Fellenius. The Bishop method produced higher FOS values than the Fellenius method, with an average difference of 2.3%. Modifying the pile geometry improved slope stability, and the optimum pile design was obtained for TRP3 with a FOS of 1.20.
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