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All Journal Jurnal Sains dan Teknologi Reaksi PESARE: Science and Engineering Service Journal JURNAL REKAYASA KIMIA & LINGKUNGAN
Harisman, Hendra
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Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Education Energy Engineering Environmental Science Materials Science & Nanotechnology Public Health

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SLOPE STABILITY ANALYSIS OF DISPOSAL AREA WITH GROUNDWATER TABLE AND MATERIAL DENSITY VARIATIONS USING THE BISHOP METHOD Oziana, Deea Rizki; Ramadhandi, Farhan; Hulwani, Zati; Harisman, Hendra; Alam, Pocut Nurul
Jurnal Sains dan Teknologi Reaksi Vol 23, No 01 (2025): JURNAL SAINS DAN TEKNOLOGI REAKSI
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v23i01.7365

Abstract

Slope stability is crucial in mining activities, particularly in disposal areas composed of loose materials with varying geotechnical conditions. Groundwater level and material density are significant factors that influence slope stability. This study aims to analyze the effects of groundwater level variations and material density on the safety factor of disposal slopes using the Bishop method within the GeoStudio SLOPE/W software framework. The research was conducted in a coal mine disposal area, divided into three cross-sections: A–A’, B–B’, and C–C’. Simulations were performed under three conditions: unsaturated (normal), saturated (due to intense rainfall), and threshold (the maximum critical condition still considered stable). The results show that rising groundwater levels significantly reduce the slope’s safety factor (SF). Under saturated conditions, the SF for all three cross-sections dropped below 1.0, indicating unstable slopes. Specifically, the SF declined from 1.15 to 0.72 for section A–A’, from 1.16 to 0.55 for B–B’, and from 1.18 to 0.81 for C–C’. In contrast, an increase in wet material density led to only moderate reductions in SF, with values remaining above 1.0. The combination of high groundwater levels and increased material density poses a critical risk factor for potential slope failure. Continuous hydrogeological monitoring is therefore essential to ensure the long-term stability of mine disposal areas. Keywords: slope stability, groundwater table, material density
Penyelidikan Struktur Bawah Permukaan di Kawasan Lam Cot, Kecamatan Darul Imarah, Aceh Besar Dengan Menggunakan Metode Geolistrik 1D Aflah, Nurul; Harisman, Hendra; Muchlis, Muchlis; Lubis, Mirna Rahmah; Pramana, Agus Hari
PESARE: Jurnal Pengabdian Sains dan Rekayasa Vol 2, No 2 (2024): Juni 2024
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/pesare.v2i2.38666

Abstract

Ketersediaan air tanah yang memadai menjadi krusial seiring dengan pertumbuhan populasi manusia. Artikel ini mengungkapkan studi tentang keberadaan sumber air tanah alternatif di Kawasan Lam Cot, Aceh Besar. Metode geolistrik resistivitas digunakan untuk mengidentifikasi kedalaman lapisan akuifer dan potensi sumber air tanah dalam. Pengukuran dilakukan pada satu titik pengukuran dengan penggunaan resistivitimeter SuperSting R8/IP. Hasil pengukuran resistivitas semu menunjukkan variasi nilai antara 0,5 hingga 193,2 m dengan kedalaman berkisar 0 hingga 140 meter. Identifikasi keadaan litologi di bawah permukaan menunjukkan adanya tanah lempung, lanau, batuan kerikil, dan batu pasir dengan nilai resistivitas yang berbeda pada kedalaman tertentu. Meskipun akuifer tidak ditemukan dalam jangkauan pengukuran, penelitian ini memberikan pemahaman yang mendalam tentang kondisi hidrogeologi kawasan tersebut. Diperlukan studi lanjutan dengan pengukuran yang lebih luas untuk mendapatkan informasi yang lebih komprehensif tentang sumber air tanah di Kawasan Lam Cot.
Mapping the Spread of Mercury from Artisanal Mining Activities in Aceh Jaya through Geochemical Surveys Aflah, Nurul; Mulkal, Mulkal; Aslam, Izzan Nur; Muchlis, Muchlis; Harisman, Hendra
Jurnal Rekayasa Kimia & Lingkungan Vol 18, No 1 (2023): Jurnal Rekayasa Kimia & Lingkungan (June, 2023 )
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v18i1.28180

Abstract

Illegal gold mining carried out using amalgamation techniques produce mercury waste which can then damage the environment and damage the health of residents. The negative impact due to the use of mercury is dead fish, contaminated river water, water quality below environmental standard quality and spreading in the food chain. This has caused environmental damage, one of which is in terms of land and water. This condition is the basis for conducting deeper research on environmental damage by mercury waste, especially in terms of soil and water. The sampling method used is the Geochemical Method and Geoelectric Method. Geoelectric samples were taken using the superstring R8 tool. Geochemical samples used were soil and water samples which were subsequently tested by the Atomic Absorption Spectrophotometry (AAS) and X-ray Fluorescence (XRF) methods to see the mercury levels that had been scattered in the research location. The study aims to determine the distribution of mercury waste and its levels. This research includes sampling, sample testing, data processing and analysis, and making maps of the distribution of mercury waste through QGis software. From the study, it was found that the distance from the traditional gold mining processing location determines the concentration level (Hg). Analysis using AAS shows that there were 13 samples had mercury concentrations above the critical threshold. From the analysis, it is also known that AAS could not detect mercury levels in soil samples which is different from the results obtained using XRF.
Co-Authors Hulwani, Zati Izzan Nur Aslam Mirna Rahmah Lubis Muchlis Muchlis Mulkal, Mulkal Nurul Aflah Oziana, Deea Rizki Pocut Nurul Alam Pramana, Agus Hari Ramadhandi, Farhan