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All Journal Jurnal Kridatama Sains dan Teknologi
Akhmad Andi Saputra
Universitas Gresik, Gresik, Indonesia
Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Social Sciences

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Analisis Kemiringan Tumpukan Material Belerang pada Area Open Storage PT. PKG Menggunakan Metode Natural Angle Of Repose Rizqi Dimas Al’faiz; Akhmad Andi Saputra; Bana Evardius
Jurnal Kridatama Sains dan Teknologi Vol 8 No 02 (2026): Jurnal Kridatama Sains dan Teknologi
Publisher : Universitas Ma'arif Nahdlatul Ulama Kebumen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53863/kst.v8i02.2376

Abstract

The storage of sulphur material in open storage areas requires control of the pile’s slope to ensure stability and operational safety. This study aims to analyse the Natural Angle of Repose (AOR), evaluate the suitability of the actual slope, identify factors affecting the slope angle, and assess the stability of sulphur material piles at PT. PKG. The study employed a descriptive quantitative method by measuring the height and base radius of the stockpile; the slope angle was then calculated using the equation θ = arctan(h/r) and analysed via linear regression. The results showed that the natural angle of repose ranged from 37.80° to 40.89°, with an average of 39.29°. Linear regression indicated that pile height, particle size, and moisture content increased the angle of repose, while the base radius decreased it. Based on the stability classification, four samples were classified as less stable and two samples as unstable. This study concludes that the stability of sulphur material stockpiles is influenced by stockpile dimensions and material characteristics. The results of this study can serve as a basis for controlling the slope angle of stockpiles to minimise the risk of landslides in open storage areas.
Analisis Stabilitas Lereng Tumpukan Gipsum Menggunakan Metode Hitungan Manual (Fellenius) Aradhana Afif Taqwanto; Akhmad Andi Saputra; Ikhtisholiyah Ikhtisholiyah; Dandy Nugroho
Jurnal Kridatama Sains dan Teknologi Vol 8 No 02 (2026): Jurnal Kridatama Sains dan Teknologi
Publisher : Universitas Ma'arif Nahdlatul Ulama Kebumen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53863/kst.v8i02.2429

Abstract

The stability of gypsum stockpile slopes is critical to ensuring occupational safety, operational continuity, and the security of industrial facilities. The stability of gypsum stockpiles is governed by the slope geometry and the geotechnical properties of the material, particularly its unit weight, cohesion, and internal friction angle. This study aims to evaluate the stability of a gypsum stockpile slope at PT X's storage area using the Fellenius method (Ordinary Method of Slices). A quantitative approach was employed through field measurements of slope geometry and the collection of geotechnical parameters from the company's technical data. The analysis was performed under drained conditions by assuming a circular slip surface and neglecting interslice forces in accordance with the fundamental assumptions of the Fellenius method. The potential sliding mass was divided into seven vertical slices to determine the ratio between resisting and driving forces, from which the Factor of Safety (FoS) was calculated. The analysis yielded a Factor of Safety of 1.98, indicating that the gypsum stockpile slope is stable and meets the accepted slope-stability criteria. The results demonstrate that the combination of slope geometry and the shear strength parameters of the gypsum material provides sufficient resistance to overcome the driving forces acting along the potential failure surface. This study contributes to the application of the manual Fellenius method for evaluating the stability of gypsum stockpiles under drained conditions and provides a preliminary reference for assessing the slope stability of gypsum stockpiles in industrial environments, as well as for future studies employing other limit equilibrium methods.
Co-Authors Aradhana Afif Taqwanto Bana Evardius Dandy Nugroho Ikhtisholiyah Ikhtisholiyah Rizqi Dimas Al’faiz