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GEOTECHNICAL INVESTIGATION OF TIDAL FLOODING-RELATED ROAD SUBSIDENCE ON THE BONTANG-KUALA ROAD SECTION Aco Wahyudi Efendi; Tukimun, Tukimun; Rizki Satria Putra; Amir Wardana
Journal of Innovation Research and Knowledge Vol. 5 No. 6 (2025): Nopember 2025
Publisher : Bajang Institute

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Abstract

The Bontang-Kuala road in East Kalimantan Province faces major problems due to daily tidal flooding and significant road subsidence. The objective of this study is to conduct a geotechnical analysis of the current conditions and develop more efficient solutions. Field surveys, soil investigations, and numerical analysis using the finite element method were employed in this study. To validate soil parameters, a back-analysis was conducted using ten years of subsidence data, which indicated a subsidence of 39.58 cm. The analysis results showed that conventional embankment reinforcement cannot withstand the required traffic load and may collapse. There are three treatment options: Pile slab structure, pile embankment with soil fill, and pile embankment with mortar foam fill. It was proven that each option meets the stability and technical design settlement requirements.
Transportation Infrastructure Optimization for Enchancing Disaster Preparedness in The Sepaku Semoi Dam Emergency Plan (EAP) Yulfadli, Zony; Tukimun, Tukimun; Putri, Friska Feronica Bn; Beg, Abul Hashem
ZERO: Jurnal Sains, Matematika dan Terapan Vol 9, No 3 (2025): Zero: Jurnal Sains Matematika dan Terapan
Publisher : UIN Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30829/zero.v9i3.25562

Abstract

This study examines the optimization of evacuation routes within the Emergency Action Plan (EAP) for the Sepaku Semoi Dam in East Kalimantan, Indonesia, through the application Analytical Hierarchy Process (AHP). The analysis was based on three key criteria : accesibility (0.45), road capacity ( 0.30) and physical resilience (0.25). The evaluation was carried out utilizing expert questionnaires (n = 80), field surveys, and secondary data, which encompassed HEC-RAS flood simulations and the official Emergency Action Plan (RTD) document. The results underscore the Silkar-Bukit Raya-Petung corridor (A1) as the most reliable evacuation route, succeeded by the Trans Kalimantan Road (A2) and the Southern Ring Road (A3), whereas the Karang Jinawi-Sotek Road (A4) plays a supplementary role for areas with high population density. Furthermore, two additional routes (A5 and A6) are suggested as qualitative extensions to the network, which are not part of the AHP ranking, aimed at enhancing spatial coverage for underserved communities. The estimation of the evacuation fleet suggests that around 23,700 residents would need transportation in the event of a dam failure. The combination of AHP with spatial and survey-based data establishes a systematic and replicable framework for prioritizing evacuation routes in the context of dam-related disaster preparedness.