Rafiuddin, Muhammad Chaidir Wahyuddin

ANALISIS KESTABILAN LERENG LAHAN BEKAS TAMBANG BIJIH NIKEL DI WILAYAH TAMBANG X, KABUPATEN LUWU TIMUR SULAWESI SELATAN

Introduction

analisis kestabilan lereng lahan bekas tambang bijih nikel di wilayah tambang x, kabupaten luwu timur sulawesi selatan. Analisis kestabilan lereng lahan bekas tambang bijih nikel di Luwu Timur, Sulawesi Selatan menggunakan metode Simplified Bishop & Rocscience Slide. Evaluasi keamanan lereng & optimasi geometri untuk stabilitas.

Abstract

Analisis kestabilan lereng dilakukan pada wilayah bekas tambang bertujuan untuk mengetahui tingkat kestabilan lereng lahan bekas tambang tersebut dipastikan keamanannya. Serangkaian data yang diperlukan meliputi data topografi dan litologi dan data sifat fisik dan mekanik material lereng. Selanjutnya dilakukan perhitungan stabilitas lereng (faktor keamanan) menggunakan metode kesetimbangan batas dengan pendekatan metode Simplified Bishop melalui software Rocscience Slide. Dibuat 5 sayatan  yang diharapkan dapat mewakili kondisi aktual pada lereng yang dikaji. Nilai faktor keamanan minimum yang digunakan yaitu FK ≥ 1,3. Hasil perhitungan faktor keamanan lereng diperoleh 2 sayatan termasuk kategori stabil yaitu  sayatan A-A’ dan C-C’ dengan nilai FK yaitu 1,434 dan 1,658. Sayatan B-B’, D-D’ dan E-E’ masuk kategori lereng tidak stabil  dengan nilai  FK sebesar 1,27, 0,796, dan 0,766. Guna mempertahankan  faktor keamanan minimum maka lereng yang tidak stabil dilakukan desain ulang dengan cara mengubah geometri lereng. Hasil optimalisasi geometri lereng keseluruhan sayatan B-B’ didapatkan tinggi lereng 28 meter dengan sudut lereng 17° menghasilkan nilai FK 1,342, untuk lereng keseluruhan pada sayatan D-D’ didapatkan tinggi lereng 47,68 meter dengan sudut lereng 19° menghasilkan nilai FK 1,301 dan lereng keseluruhan pada sayatan E-E’ didapatkan tinggi lereng 67,14 meter dengan sudut lereng 17° menghasilkan nilai FK 1,398

Review

This paper, "Analisis Kestabilan Lereng Lahan Bekas Tambang Bijih Nikel di Wilayah Tambang X, Kabupaten Luwu Timur Sulawesi Selatan," presents a timely and relevant investigation into the critical issue of slope stability in post-mining environments. The focus on former nickel ore mine lands addresses a significant environmental and safety concern associated with extractive industries, particularly in areas like East Luwu Regency, South Sulawesi, which are often prone to such activities. The primary objective of the study to ascertain the stability level of these slopes and consequently ensure their safety is commendable and crucial for sustainable land reclamation and risk management. The methodology employed in this study appears robust and standard for slope stability analysis. The authors utilized essential data inputs, including topographical and lithological information, alongside the critical physical and mechanical properties of the slope materials. Adopting the limit equilibrium method with the Simplified Bishop approach, implemented via the industry-standard Rocscience Slide software, lends credibility to the analytical process. The initial analysis, conducted on five representative cross-sections, identified a mixed stability profile: two sections (A-A’ and C-C’) were deemed stable with satisfactory safety factors (FK > 1.3), while three sections (B-B’, D-D’, and E-E’) fell below the minimum acceptable threshold, indicating instability. A particularly valuable aspect of this research is the subsequent effort to redesign the unstable slopes by modifying their geometry. This optimization exercise successfully elevated the safety factors of all previously unstable sections (B-B’, D-D’, E-E’) to above the critical FK of 1.3, providing practical solutions for risk mitigation. This paper offers significant practical implications by not only identifying unstable slope conditions but also providing tangible, optimized geometries to ensure long-term stability and safety. This re-design aspect is crucial for informing effective land reclamation strategies and supporting sustainable development in post-mining landscapes, especially given the environmental sensitivity of such areas. While the study provides a solid foundation, future work could benefit from incorporating a more detailed discussion of the geological and geotechnical rationale behind the varying initial stability conditions across the sections. Furthermore, considering potential external factors such as rainfall infiltration and seismic activity, which can significantly influence long-term stability in tropical and potentially seismically active regions, would enhance the comprehensiveness of the analysis. A brief discussion on the economic feasibility or implementability of the proposed redesigns, along with suggestions for continuous monitoring, would further strengthen the practical applicability and holistic value of this well-executed study.

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