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Asof, M.
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REKOMENDASI GEOMETRI PELEDAKAN BATUAN ANDESIT UNTUK HASIL FRAGMENTASI YANG BAIK Pebrianto, R.; Al Hadi, A.; Asof, M.; Paloma, N.
Jurnal Pertambangan Vol 8 No 2 (2024): Mei 2024
Publisher : Fakultas Teknik Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jp.v8i2.2296

Abstract

Berdasarkan geometri peledakan aktual bulan November-Desember 2023, diperoleh hasil distribusi fragmentasi aktual 30 kali peledakan menggunakan software Split desktop 2.0. Rata-rata jumlah material yang berukuran ≤80 cm sebanyak 63,38% dan menghasilkan ukuran ≥80cm (boulder) batu andesit sebesar 36,61%. Proses pembongkaran batu andesit di PT MBS dilakukan menggunakan proses drilling and blasting, dengan standar hasil peledakan yang berukuran ≤80 cm sebanyak 70% dan yang berukuran ≥80 cm sebanyak 30%. Berdasarkan hasil perhitungan dan pengamatan langsung, kegiatan peledakan ini belum memenuhi standar perusahaan dimana didapatkan fragmentasi berukuran ≤80 cm sebanyak 63,38% dan boulder ≥80 cm sebanyak 36,61%. Melalui penelitian ini ingin diketahui geometri peledakan yang diterapkan di perusahaan; mengukur distribusi fragmentasi batuan andesit aktual menggunakan metode kuz-ram dan software split desktop 2.0; membuat rancangan ulang geometri peledakan secara teoritis menurut C.J Konya (1990); dan membandingkan distribusi hasil fragmentasi aktual dan rancangan ulang. Metode penelitian ini menggunakan persamaan C.J Konya untuk menghitung redesign geometri peledakan, dan menggunakan metode Kuz-Ram dan Software Split Desktop untuk menghitung ukuran fragmentasi secara perkiraan dan aktual. Sehingga dilakukan redesign jarak burden dari 2,27 m menjadi 2 m, spacing 2,32 m menjadi 2,74 m, stemming 2,32 m menjadi 2 m, subdrilling 0,5 m menjadi 0,6 m, kedalaman lubang ledak 6,11 m menjadi 8,6 m, nilai powder factor 0,42 kg/bcm (0,17 kg/ton) menjadi 0,58 kg/bcm (0,23 kg/ton). Distribusi fragmentasi geometri redesign menggunakan software Split Desktop 2.0 didapatkan ukuran ≤80 cm sebanyak 94,31% dan menggunakan analisis kuz-ram sebanyak 22,477%.
ANALYSIS OF THE EFFECT GROUNDWATER LEVEL FLUCTUATION ON SLOPE STABILITY IN THE COAL MINING PLAN Dwi, A. N.; Asof, M.; Purbasari, D.
Jurnal Pertambangan Vol 8 No 4 (2024): November 2024
Publisher : Fakultas Teknik Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jp.v8i4.2467

Abstract

Based on geotechnical drilling activities carried out in the PT Battoman Coal mining plan area, it is known that the slope material is dominated by claystone. According to Chen (1975), claystone can be expansive when exposed to water, disrupting slope stability. The presence of the Sungai Putih tributary in the mining plan area can also affect slope stability. This research aims to analyze the influence of groundwater level fluctuations on slope stability in the PT Battoman Coal mining plan area based on actual conditions as a result of the research. Ground water level observations and measurements were conducted using the Casagrande piezometer method and observation wells in the high wall area. Slope stability analysis was carried out using the software Rocscience Slide V.6 using the Morgenstern Price method and the Mohr-Coulomb failure type by simulating slopes in actual conditions, the results of the highest and lowest groundwater measurements in the period September to October 2023, namely 4,26 meters and 28,45 meters from the ground surface. The analysis was carried out in pseudo-static conditions using mining area seismicity factors based on the Indonesian Seismic Zone Map according to the Ministry of PUPR in 2017. Overall slope area high walls in cross sections A-A' and B-B' are included in the critical to stable category with FK values between 0,901 to 1,782. Recommendation of overall slope designed by Kepmen ESDM 1827K/MEM/2018 so that it is obtained overall slope which is stable in saturated conditions with FK values between 1,176 to 1,245.