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All Journal Journal of Degraded and Mining Lands Management JOURNAL ONLINE OF PHYSICS Jurnal Teknologi Mineral dan Batubara Indonesian Mining Journal IJEMS (Indonesian Journal of Environmental Management and Sustainability) Humantech : Jurnal Ilmiah Multidisiplin Indonesia NUSANTARA: Jurnal Pengabdian Kepada Masyarakat Jurnal Riset Rumpun Ilmu Teknik (JURRITEK) TEKSTUR : Jurnal Teknologi Infrastruktur Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan Jurnal Teknologi Mineral dan Batubara Jurnal Teknik dan teknologi tepat guna Indonesian Mining Journal Venus: Jurnal Publikasi Rumpun Ilmu Teknik Jurnal Pelayanan Masyarakat Solusi Bersama : Jurnal Pengabdian Dan Kesejahteraan Masyarakat Jurnal Keilmuan dan Aplikasi Teknologi Industri
Hisni Rahmi
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Geotechnical zonation and bearing capacity assessment for risk-informed foundation design in the heterogeneous soils of Girsang Sipangan Bolon, Indonesia Nata, Refky Adi; Ren, Gaofeng; Andas, Jukepsa; Yulanda, Yudi Arista; Rahmi, Hisni; Syahmer, Verra
Journal of Degraded and Mining Lands Management Vol. 13 No. 1 (2026)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2026.131.9567

Abstract

Subsurface?failures, often caused by poor site investigation, are a serious issue in geotechnical engineering. This research focused on unpredictable soil response at a geologically complex site in Girsang Sipangan Bolon District, Indonesia, where very high significant variation in subsoil conditions led to foundation failure. The subsurface profile was studied, and the ultimate bearing capacity (UBC) was first characterized in this research for safe foundation design. The site investigation utilized 11 boreholes, including Standard Penetration Tests (SPTs) and undisturbed sampling. They processed the readings using Meyerhof's theory and determined the UBC for strip, pad, and circular foundations. The findings showed extremely high subsurface heterogeneity (with SPT-N values between very soft top layers and ultra-dense rock-coral). Therefore, there?is a large variation in the predicted UBC. Based on statistical analysis of the data, clear geotechnical zones were defined, with some boreholes showing high, consistent capacity and others showing locally weak strata. Fill and ring foundations also had greater theoretical bearing?capacities than rectangular footings. The main conclusion is that?sufficiently pronounced subsurface heterogeneity requires site-specific geotechnical investigations to minimize the risk of differential settlement. Therefore, foundation design cannot be uniform throughout the site; deep foundations, such as end-bearing piles, are suggested in highly variable zones to transfer loads to competent strata and ensure long-term structural safety.
Penurunan Kadar Fe Dan Mn Menggunakan Kapur Tohor (CaO) Pada Penetralan Air Asam Tambang Vernando, Yolno; Nelvi, Afni; Fadhly, Ahmad; Hadiyansyah, Dian; Rahmi, Hisni
Jurnal Teknologi Infrastruktur Vol 7 No 02 (2025): Jurnal Teknologi Infrastruktur Vol 7 No 02 tahun 2025
Publisher : Fakultas Teknik Universitas Panca Bhakti

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Abstract

The treatment of acid mine drainage at PT Bumi Bara Makmur Mandiri is conducted using an active treatment method. It was found that there is cloudy wastewater with a brownish and reddish-brown color in the settling pond. The objective of this study was to analyze the changes in pH, Fe and Mn concentrations in acid mine drainage samples using quicklime and to calculate the cost required for neutralizing the acid mine drainage. The neutralization process was carried out on a laboratory scale using an experimental method with 3 variations of quicklime doses: 0.2 g/l, 0.3 g/l, and 0.4 g/l. The results showed that quicklime is effective in reducing Fe and Mn value in acid mine drainage. The initial pH of the acid mine drainage was 6.05. The pH increased with the increase in the quicklime coagulant dose. The Fe concentration before the neutralization of acid mine drainage was 1.20 mg/l, which decreased to 0.15 mg/L for all given dose variations. The initial Mn concentration exceeded the environmental quality standard and showed a significant reduction at a dosage of 0.2 g/L, decreasing from 72.20 mg/L to 0.08 mg/L. Similar Mn concentrations were obtained at dosages of 0.3 g/L and 0.4 g/L, each resulting in 0.122 mg/L. The cost required to neutralize Fe and Mn was IDR 368,000 per day, or IDR 11,040,000 per month.
Rancangan Sequence dan Penjadwalan Rolling Plan Three Months untuk Mencapai Target Produksi Batubara Desmawita; Deden Saputra; Doli Jumat Rianto; Marliantoni; Hisni Rahmi; Marisa Oktavia; Devit Rahmawati
Jurnal Sains dan Teknologi: Jurnal Keilmuan dan Aplikasi Teknologi Industri Vol. 25 No. 2 (2025): Regular Issue
Publisher : SEKOLAH TINGGI TEKNOLOGI INDUSTRI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36275/abgk0w87

Abstract

PT. Era Perkasa Mining merencanakan target produksi batubara pada periode Oktober hingga Desember 2024, sehingga diperlukan perencanaan penambangan yang terstruktur untuk mencapai target secara optimal. Penelitian ini bertujuan menyusun rencana produksi berdasarkan batas pit limit yang memenuhi target teknis produksi. Metode yang digunakan meliputi perhitungan cadangan dan volume overburden dengan metode solid reserve menggunakan blok analisis 50 x 50 meter, kemudian dilakukan forecast produksi dengan mempertimbangkan kapasitas dan ketersediaan alat gali muat serta alat angkut yang tersedia saat ini. Data hasil perhitungan cadangan dan produktivitas alat diolah menggunakan software tambang untuk membuat mine scheduling serta desain sequence penambangan dengan memperhatikan rekomendasi geoteknik perusahaan. Hasil penelitian menunjukkan estimasi cadangan batubara sekitar 1.324.810 ton dan volume overburden 5.976.517 bcm, serta forecast produksi batubara/bulan mendekati target perusahaan dengan stripping ratio antara 3,44. Desain pit penambangan mengikuti standar geoteknik dengan tinggi bench 5 meter, lebar 3 meter, dan kemiringan single slope 50°. Terdapat perbedaan volume antara desain pit dan forecast, perencanaan ini tetap mengacu pada kapasitas alat yang tersedia dan target produksi. Perencanaan produksi yang tersusun secara sistematis dengan dukungan software tambang untuk membuat penjadwalan produksi serta pemanfaatan alat yang optimal akan membantu PT Era Perkasa Mining dalam mencapai target produksi batubara pada akhir tahun 2024.
Co-Authors Afni Nelvi Ahmad Fadhly Amanda, Ridho Rizky Ambarita, Novitasari Anaperta, Yoszi Andy Yanottama Angga Saputra Anna Yulianita Arista, Anggia Azhar Kholiq Affandi C Eka Putra, Jevie C. Eka Putra, Jevie Deden Saputra Desmawita Devit Rahmawati Diah Wully Agustine Didik Susetyo Doli Jumat Rianto Elmawati Elmawati Ericson Ericson Fadhly, Ahmad Hadiyansyah, Dian Jukepsa Andas Lydia Kartika Basaria Sitompul M. Randi Al Falah Assyakiri Maisa Illahi Darni Marisa Oktavia Mariza Syahyuda, Nelsy Marliantoni Marluga Banjarnahor, Ely Muhammad Faisal Seprizal Nata, Refky Adi Nelvi, Afni Nofriadiman, Nofriadiman Nuriil Tadersi, Risnaliyah Permadi, Dimas Agung Pranata Saragi, Christian Putra, Dego Retiandi Qurratul Ayun Qurratul A’yun Ren, Gaofeng Restu Juniah restu juniah, restu Restu Permana Riam Marlina A Ridho Yovanda Rosihan Febrianto Situmorang, Boyman Syahmer, Verra Syahrani, Achmad Muharram Syaifudin Zakir Syaifudin Zakir, Syaifudin Syarifudin Vernando, Yolno Vina Lestari Riyandini, Vina Lestari Yovanda, Ridho Yudi Arista Yulanda Yuli Andriani Zella Navtalia