| Abstrak (Bhs. Indonesia) | Daerah penelitian ini berada pada Kecamatan Tanjung Enim, Kabupaten Muara Enim, Provinsi Sumatera Selatan, Indonesia, yang merupakan salah satu Unit Pertambangan PT. Bukit Asam Tbk. Stratigrafi daerah penelitian termasuk kedalam Formasi Muaraenim yang terdiri dari litologi batulempung (claystone), batupasir (sandstone), batulanau tuffan (tuffaceous siltstone) dengan sisipan batubara. Struktur yang berkembang berupa lipatan dengan orientasi SE-NW. Lapisan batubara yang ditemukan pada daerah penelitian terdiri dari 5 seam yaitu seam A1, seam A2, seam B1, seam B2, seam C, seam D dan seam E. Lingkungan pengendapan nya berupa lingkungan transisi yaitu upper delta plain, dan ditemukan juga satuan batuan tuff dengan yang diendapkan secara tidak selaras yang diendapkan pada lingkungan darat dengan fasies gunung api medial. Desain lereng lowwall dengan geometri lereng tinggi 99,6m, lebar 310,1m, sudut lereng keseluruhan 17,84˚, sudut lereng tunggal 45˚, lebar ramp antara 30-40m dan lebar bench 8m didapatkan nilai Faktor Keamanan secara deterministik sebesar 1,25 dan Faktor Keamanan secara probabilistik sebesar 1,34 dengan Probabilitas Kelongsoran sebesar 4,3%. Lereng highwall dengan geometri lereng tinggi 90,4m, lebar 241,3m, sudut lereng keseluruhan 20,42˚, sudut lereng tunggal 45˚, lebar ramp 30-34m, lebar bench 8m, didapatkan nilai FK secara deterministik sebesar 1,32 dan secara probabilistik sebesar 1,27 dengan nilai PK sebesar 10,5%. Redesain geometri lereng lowwall adalah dengan tinggi 100,48m, lebar 295,56m, sudut lereng keseluruhan 18,73˚, sudut lereng tunggal 45˚, lebar ramp 34-45m, lebat bench 8m, didapatkan nilai Faktor Keamanan sebesar 1,26 dan nilai Probabilitas Kelongsoran sebesar 10,2%. Redesain geometri lereng highwall adalah dengan tinggi 90,47m, lebar 222,56m, sudut lereng keseluruhan 21,98˚, sudut lereng tunggal 45˚, lebar ramp 30m, lebar bench 8m, didapatkan nilai FK sebesar 1,21 dan nilai PK sebesar 11,7%. Berdasarkan hasil tersebut lereng desain dan redesain baik pada sisi highwall dan sisi lowwall sudah aman atau stabil. |
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| Abtrak (Bhs. Inggris) | This research area is in Tanjung Enim District, Muara Enim Regency, South Sumatra Province, Indonesia, which is one of the Mining Units of PT. Bukit Asam Tbk. The stratigraphy of the research area belongs to the Muaraenim Formation which consists of claystone, sandstone, tuffaceous siltstone lithology with coal inserts. The structure that develops is a fold with a SE-NW orientation. The coal layers found in the research area consist of 5 seams, namely seam A1, seam A2, seam B1, seam B2, seam C, seam D and seam E. The depositional environment is a transitional environment, namely the upper delta plain, and tuff rock units are also found. with those deposited unconformably which were deposited in terrestrial environments with medial volcanic facies. The lowwall slope design with a high slope geometry of 99.6m, a width of 310.1m, an overall slope angle of 17.84˚, a single slope angle of 45˚, a ramp width of between 30-40m and a bench width of 8m obtained a deterministic Safety Factor value of 1.25 and the probabilistic Safety Factor is 1.34 with a Landslide Probability of 4.3%. Highwall slope with a high slope geometry of 90.4m, width of 241.3m, overall slope angle of 20.42˚, single slope angle of 45˚, ramp width of 30-34m, bench width of 8m, obtained a deterministic FK value of 1.32 and automatically probabilistic is 1.27 with a PK value of 10.5%. The lowwall slope geometry redesign is 100.48m high, 295.56m wide, overall slope angle 18.73˚, single slope angle 45˚, ramp width 34-45m, bench depth 8m, obtained a Safety Factor value of 1.26 and a value of The probability of landslides is 10.2%. The redesign of the highwall slope geometry is with a height of 90.47m, a width of 222.56m, an overall slope angle of 21.98˚, a single slope angle of 45˚, a ramp width of 30m, a bench width of 8m, obtained an FK value of 1.21 and a PK value of 11 .7%. Based on these results, the design and redesign slopes on both the highwall and lowwall sides are safe or stable.
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