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

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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.
Analisis Permeabilitas Tanah pada Tubuh Waduk Gedang Kulut Mochammad Dias Eca Mantofani; Edy Priyanto; 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.v8i02.2422

Abstract

Soil permeability is one of the key geotechnical parameters that describes the ability of soil to transmit water through its pore spaces. In reservoir construction, soil permeability significantly influences seepage, which may affect water storage efficiency and the stability of the reservoir embankment. This study aimed to determine the soil permeability coefficient of the Gedang Kulut Reservoir embankment and to analyze its permeability characteristics as a parameter for evaluating the suitability of the embankment material. A quantitative method with a descriptive-analytical approach was employed. Undisturbed soil samples were collected from a single sampling point, followed by five permeability tests using the Constant Head Test method based on Darcy’s Law. In addition, particle-size distribution analysis was conducted using sieve analysis to support soil characterization. The results showed that the permeability coefficients obtained from the five tests were 0.00043, 0.00034, 0.00025, 0.00039, and 0.00031 cm/s, respectively, with an average value of 0.000344 cm/s (3.44 × 10⁻⁶ m/s). Based on the soil permeability classification, the soil was categorized as having low permeability, indicating a relatively low capacity to transmit water. These findings suggest that, in terms of permeability, the soil at the study site is suitable for use as embankment material for the reservoir. Nevertheless, a comprehensive evaluation of material suitability requires further assessment of other geotechnical parameters
Co-Authors Akhmad Andi Saputra Aradhana Afif Taqwanto Edy Priyanto Ikhtisholiyah Ikhtisholiyah Mochammad Dias Eca Mantofani