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All Journal Jurnal Ilmiah Dinamika Rekayasa
Budhi Setiawan
Geological Engineering Study Program University of Sriwijaya

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Slope Stability Analysis of Pit X Using the Morgenstern-Price and Dump Slope Rating Methods Ferdinan Rio; Budhi Setiawan; Rosihan Pebrianto
Jurnal Ilmiah Dinamika Rekayasa Vol. 21 No. 2 (2025): Jurnal Ilmiah Dinamika Rekayasa - Juli
Publisher : Engineering Faculty, UNSOED

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jidr.2025.21.2.10

Abstract

This study evaluates slope stability in Pit X, located in the open-pit mining area of PT Bukit Asam, Muara Enim Regency, South Sumatra. The site was previously used as a disposal area for overburden material, resulting in heterogeneous geotechnical characteristics and a higher potential for slope instability. The approaches applied in this study include the limit equilibrium method to calculate the factor of safety (FoS) and the Dump Slope Rating (DSR) method to assess the risk level of the slope empirically. The data were obtained from field observations and laboratory testing of shear strength parameters. The results show that section B–B’ had the lowest FoS of 1.61 and a DSR score of 63, classified as poorly stable, while section D–D’ had a FoS of 3.36 and a DSR score of 93, indicating very stable conditions. The consistency between both methods confirms that the integrated approach is practical in evaluating slope conditions and providing technical recommendations under complex geotechnical settings.
Assessment of The Rakihan Lake Geosite Using Participatory Action Research and The Modified Geosite Assessment Model Budhi Setiawan; Friska Adelia
Jurnal Ilmiah Dinamika Rekayasa Vol. 22 No. 1 (2026): Jurnal Ilmiah Dinamika Rekayasa - Januari
Publisher : Engineering Faculty, UNSOED

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jidr.2026.22.1.95

Abstract

This study presents a comprehensive assessment of the Rakihan Lake geosite in South OKU, Indonesia, utilizing Participatory Action Research (PAR) and the Modified Geosite Assessment Model (M-GAM). The PAR approach actively engaged local communities, government officials, and site managers throughout the research process, fostering collaboration and integrating local knowledge with scientific expertise. The M-GAM method was employed to evaluate the geosite’s main and additional values across 27 sub-indicators, reflecting both expert and visitor perspectives. Results indicate that Rakihan Lake possesses moderate principal value and low additional value, primarily due to limited geological knowledge, inadequate infrastructure, and restricted accessibility. Despite these challenges, the integration of PAR and M-GAM proved effective in identifying key areas for improvement and promoting participatory conservation strategies. The findings underscore the importance of community involvement and targeted geoeducation in enhancing the sustainability and development potential of geosites.
Characterization Of Groundwater Facies Using The Piper Diagram In The Rakihan Lake Area, Sindang Danau District, South Ogan Komering Ulu Regency, South Sumatra Province Dianita Septia Wardani; Budhi Setiawan; Dede Nurohim
Jurnal Ilmiah Dinamika Rekayasa Vol. 22 No. 2 (2026): Jurnal Ilmiah Dinamika Rekayasa - Juli
Publisher : Engineering Faculty, UNSOED

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jidr.2026.22.2.118

Abstract

Lake Rakihan is a water system located in the active zone of the Sumatran Fault that developed in a volcanic environment; as a result, its hydrogeochemical characteristics are influenced by local geological conditions. This study aims to identify the hydrogeochemical characteristics of groundwater and surface water in the Lake Rakihan area, South Ogan Komering Ulu Regency, South Sumatra, based on water chemistry analysis. The concentrations of major ions were converted to milliequivalents per liter (meq/L) and validated using the Charge Balance Error (CBE) method before being interpreted using a Piper diagram. The validation results showed that only samples C473-4, C473-5, and C473-6 met the ion balance criteria (CBE ≤ ±5%), while the other samples did not meet the criteria and were therefore not used in the interpretation. The Piper diagram indicates that samples C473-4 and C473-6 belong to the Ca–Mg–HCO₃ facies, while C473-5 falls within the Mixed Type facies between Mg–HCO₃ and Ca–Cl. The dominance of Ca²⁺, Mg²⁺, and HCO₃⁻ ions indicates that the hydrogeochemistry of the water is primarily controlled by water–rock interaction processes through the weathering of volcanic rocks. In general, the hydrogeochemical system in the Lake Rakihan area reflects the characteristics of local groundwater flow, which is still dominated by natural processes.
Co-Authors Dede Nurohim Dianita Septia Wardani Ferdinan Rio Friska Adelia Rosihan Pebrianto