Electronic Theses and Dissertation

Kegiatan penambangan terbuka dapat menyebabkan perubahan kondisi permukaan akibat proses penggalian yang berlangsung secara terus-menerus. Perubahan tersebut berpengaruh terhadap kondisi geoteknik area penambangan, khususnya kestabilan lereng yang berpotensi mengalami longsoran. Oleh karena itu, diperlukan analisis kestabilan lereng untuk mengetahui kondisi lereng serta potensi pergerakan yang terjadi pada area penambangan. Penelitian ini bertujuan untuk menganalisis deformasi permukaan lereng menggunakan metode Interferometric Synthetic Aperture Radar (InSAR), menganalisis nilai Faktor Keamanan (FK) menggunakan metode Bishop’s Simplified, serta menganalisis keterkaitan antara deformasi permukaan dan kestabilan lereng. Analisis kestabilan lereng dilakukan menggunakan software Rocscience Slide berdasarkan geometri lereng dari Digital Elevation Model (DEM) dan parameter geoteknik material. Analisis deformasi dilakukan menggunakan citra Sentinel-1 yang diolah melalui software Sentinel Application Platform (SNAP) dan Quantum GIS (QGIS). Hasil penelitian menunjukkan nilai FK berkisar antara 1,562–1,802 sehingga seluruh lereng tergolong stabil berdasarkan Kepmen ESDM No. 1827K/30/MEM/2018. Nilai deformasi permukaan berada pada rentang -0,37 cm hingga -3,53 cm dengan rata-rata sebesar -1,861 cm yang menunjukkan penurunan permukaan dalam skala kecil dan lambat. Hubungan antara deformasi dan FK bersifat berbanding terbalik dengan koefisien determinasi sebesar 0,7942 yang mengidentifikasikan keterkaitan yang kuat. Secara keseluruhan, integrasi metode Bishop’s Simplified dan InSAR mampu memberikan gambaran kondisi kestabilan lereng secara lebih menyeluruh.

Kata Kunci: Kestabilan Lereng, Bishop’s Simplified, InSAR, Deformasi, FK

Open-pit mining operations can cause changes to surface conditions due to the ongoing excavation process. These changes affect the geotechnical conditions of the mining area, particularly the stability of slopes that are at risk of landslides. Therefore, a slope stability analysis is required to determine the condition of the slopes and the potential for movement within the mining area. This study aims to analyses surface deformation of slopes using the Interferometric Synthetic Aperture Radar (InSAR) method, to analyses Safety Factor (SF) values using the Bishop’s Simplified method, and to analyses the relationship between surface deformation and slope stability. Slope stability analysis was conducted using Rocscience Slide software based on slope geometry derived from a Digital Elevation Model (DEM) and geotechnical material parameters. Deformation analysis was performed using Sentinel-1 imagery processed via the Sentinel Application Platform (SNAP) and Quantum GIS (QGIS). The research results show that the FK values range from 1.562 to 1.802, meaning that all slopes are classified as stable in accordance with Ministry of Energy and Mineral Resources Decree No. 1827K/30/MEM/2018. Surface deformation values range from -0.37 cm to -3.53 cm, with an average of -1.861 cm, indicating small-scale and slow surface subsidence. The relationship between deformation and FK is inversely proportional, with a coefficient of determination of 0.7942, indicating a strong correlation. Overall, the integration of the Bishop’s Simplified and InSAR methods provides a more comprehensive picture of slope stability conditions. Keywords: Slope Stability, Bishop’s Simplified, InSAR, Deformation, SF