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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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Religion Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences Transportation

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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.
Estimasi Sumberdaya Batubara Menggunakan Metode Kriging di PT. Inti Bara Perdana, Taba Penanjung Qurratul A’yun; Hisni Rahmi; Yudi Arista Yulanda
JURAL RISET RUMPUN ILMU TEKNIK Vol. 5 No. 1 (2026): April: Jurnal Riset Rumpun Ilmu Teknik
Publisher : Pusat riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurritek.v5i1.8164

Abstract

This study aims to estimate coal resources using the kriging method at PT. Inti Bara Perdana, Taba Penanjung, Bengkulu. Geostatistical analysis was applied to evaluate spatial variability of coal quality parameters, including total moisture (TM), inherent moisture (IM), ash content (ASH), volatile matter (VM), fixed carbon (FC), and calorific value (CV). The research utilized drilling data with an average spacing of 80 meters. Variogram modeling was conducted using SGeMS software, employing spherical models to determine nugget, sill, and range parameters. The results show a low nugget effect (0%) indicating strong spatial continuity. The obtained ranges vary between 180–1296 meters depending on the parameter. Blo./ck kriging estimation was performed using block dimensions of 25 × 25 × 8 meters and a coal density of 1.3 ton/m³. The total estimated coal resource up to an elevation of 230 m is 253,500 tons. These findings demonstrate that kriging provides reliable resource estimation and supports mine planning optimization. This research contributes to improving coal resource evaluation accuracy and operational decision-making in open-pit mining.
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

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.
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 Cressendo, Hedsing Diah Wully Agustine Didik Susetyo Dimas Agung Permadi Elmawati Elmawati Ericson Ericson Ervil, Riko Fadhly, Ahmad Hadiyansyah, Dian Jukepsa Andas Lydia Kartika Basaria Sitompul M. Randi Al Falah Assyakiri Maisa Illahi Darni Mariza Syahyuda, Nelsy Marluga Banjarnahor, Ely Muhammad Faisal Seprizal Nata, Refky Adi Nelsy Mariza Syahyuda Nelvi, Afni Nofriadiman, Nofriadiman Nuriil Tadersi, Risnaliyah 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 Riko Ervil Rosihan Febrianto Situmorang, Boyman Syahmer, Verra Syahrani, Achmad Muharram Syaifudin Zakir Syaifudin Zakir, Syaifudin Syarifudin Vernando, Yolno Vina Lestari Riyandini Yovanda, Ridho Yudi Arista Yulanda Yudi Arista Yulanda Yuli Andriani Zella Navtalia