Analisis Risiko dengan Pendekatan Semi-Kuantitatif untuk Stabilitas Lereng Highwall pada PIT B1 PT. Pancaran Surya Abadi Kabupaten Kutai Kartenegara
DOI:
https://doi.org/10.55606/jurritek.v5i1.7628Keywords:
Groundwater Level, Risk Analysis, Risk Matrix, Safety Factor, Semi-QuantitativeAbstract
Guaranteeing the geotechnical stability of slopes is an absolute prerequisite for the sustainability of open pit mining operations, considering the potential for multidimensional losses due to slope failure. The specific geological conditions at PIT B1 PT. Pancaran Surya Abadi, which is composed of sedimentary rocks (coal, sandstone, and claystone), are susceptible to degradation and softening, especially due to high rainfall that causes an increase in pore water pressure and a decrease in rock shear strength. This study aims to analyze the stability of highwall slopes using the Morgenstern-Price Method to determine the Safety Factor (SFF) value according to Ministerial Decree number 1827 K/30/MEM/2018, and continued with a semi-quantitative risk analysis. The analysis results show that the initial slope has a static SFF of 0.77 (Not Safe). After redesign, the recommended optimal single slope geometry is: sandstone (Height 5 m, Angle 20°, Berm 5 m) and claystone (Height 10 m, Angle 60°, Berm 5 m). This redesign resulted in a FK of 1.34 (Safe). Sensitivity analysis to groundwater level rise (GTL) showed that the GTL value remained safe (GTL ≥1.30) up to a 30% increase in GTL. However, a 40% to 80% increase in GTL caused the GTL to decrease (1.28–1.21), classified as Medium Risk. A 100% increase in GTL drastically reduced the GTL to 1.05, classified as High Risk. This study emphasizes the need for close monitoring and additional drainage to maintain the long-term stability of slopes under the influence of rainfall.
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References
Abramson, L. W., Lee, T. S., Sharma, S., & Boyce, G. M. (2002). Slope stability and stabilization methods (2nd ed.). John Wiley & Sons.
Andeka, B. R., Wijaya, M. R., & Nurfarida. (2021). Analisis risiko dengan metode ISO 31000 pada Disperinnaker Kota Salatiga bidang industri. JATISI: Jurnal Teknik Informatika dan Sistem Informasi, 8(3), 1105–1118. https://doi.org/10.35957/jatisi.v8i3.1037
Arif, I. (2016). Geoteknik tambang. PT Gramedia Pustaka Utama.
Astawa Rai, M., Arifin, Y. I., & Siagian, U. (2010). Mekanika batuan. Penerbit ITB.
Australian/New Zealand Standards. (2004). AS/NZS 4360:2004 risk management guidelines. Standards Australia.
Azizi, M. A., Musa, R. H., Manaf, A., & Noer, M. A. (2012). Analisis risiko kestabilan lereng tambang terbuka (studi kasus tambang mineral X). Dalam Prosiding Simposium dan Seminar Geomekanika Ke-1 (hlm. 19–27). Jakarta.
Brady, B. H. G., & Brown, E. T. (1993). Rock mechanics for underground mining (2nd ed.). Chapman and Hall.
Fell, R., Corominas, J., Bonnard, C., Cascini, L., Leroi, E., & Savage, W. Z. (2005). Guidelines for landslide susceptibility, hazard and risk zoning for land-use planning. Engineering Geology, 76(3–4), 3–30. https://doi.org/10.1016/j.enggeo.2004.08.001
Guskarnali, Oktarianty, H., & Armelia, D. (2020). Pengaruh sifat fisik batuan terhadap kuat tekan uniaksial pada batu granit di Pulau Bangka. Jurnal Geomine, 8(3), 214–219. https://doi.org/10.33536/jg.v8i3.712
Kementerian Energi dan Sumber Daya Mineral Republik Indonesia. (2018). Keputusan Menteri ESDM Nomor 1827 K/30/MEM/2018 tentang pedoman pelaksanaan teknik pertambangan yang baik.
Mohammadi, B., Haghani, F., & Sadrzadeh, B. (2023). Identification and categorization of hazards in the mining industry: A systematic review of the literature. International Review of Applied Sciences and Engineering, 15(1), 1–11. https://doi.org/10.1556/1848.2023.00621
Prasetyo, S. I., Hariyanto, R., & Cahyadi, T. A. (2011). Studi kasus analisa kestabilan lereng disposal di daerah Karuh, Kecamatan Kintap, Kabupaten Tanah Laut, Kalimantan Selatan. Dalam Seminar Nasional Rekayasa Teknologi Industri dan Informasi ke-6. UPN Veteran Yogyakarta.
Read, J., & Stacey, P. (2009). Guidelines for open pit slope design. CSIRO Publishing. https://doi.org/10.1071/9780643101104
Rivaldi, L. S., Rachmadhani, M. M., Tosofu, A. Z., Mbisikmbo, M., & Supriatna, I. I. (2024). Analisa risiko menggunakan metode likelihood dan consequence risk matriks. Industrial Engineering Journal System, 2(2), 67–77.
Sepriadi, Mirza, A., & Kenyta, A. Z. (2024). Analisis kestabilan lereng highwall dengan metode Morgenstern–Price pada PIT 2 Banko Barat di PT Bukit Asam Tbk. Jurnal Ilmiah Teknik dan Sains, 2(2), 66–73. https://doi.org/10.62278/jits.v2i2.38
U.S. Army Corps of Engineers. (2003). Risk-based analysis in geotechnical engineering for earth structures (Engineer Manual EM 1110-2-1619). Department of the Army, U.S. Army Corps of Engineers.
Ummi, N., Umyati, A., & Rahmawati, R. (2018). Analisis risiko keselamatan dan kesehatan kerja menggunakan metode analisis semi kuantitatif AS/NZS 4360:1999 dan PUSLITBANG Teknologi Mineral dan Batubara pada PT XYZ. Journal Industrial Services, 4(1), 14–20. https://doi.org/10.36055/jiss.v4i1.4083
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