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Tulus Widiarso
Universitas Trisakti
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Journal : Technomedia Journal

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Software Based Geotechnical Analysis of Spillway Slope Reinforcement Fabyanto, Ikhsan; Zaki, Muhammad; Pontan, Darmawan; Widiarso, Tulus
Technomedia Journal Vol 10 No 2 (2025): October
Publisher : Pandawan Incorporation, Alphabet Incubator Universitas Raharja

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33050/zzgyr313

Abstract

The construction of large-scale infrastructure such as dams requires precise planning and implementation to ensure structural stability and long-term operational safety. This study aims to analyze slope protection and embankment reinforcement at the spillway excavation area of the Dam Project in Surian District, located in the 137 km-long Cipunagara River Basin. A quantitative approach was applied, using geotechnical modeling software Plaxis 8.6 and Microsoft Excel for data processing. Three slope reinforcement methods were compared: geomat, shotcrete, and cocomesh. Based on the analysis, slope reinforcement using shotcrete achieved the highest safety factor, with short-term SF = 1.649 (34.50% increase) and long-term SF = 1.514 (23.49% increase). Geomat ranked second with SF = 1.544 (25.94%) and 1.418 (15.66%), while cocomesh obtained SF = 1.540 (25.61%) and 1.355 (10.52%). The unreinforced slope had an SF of 1.226. In terms of cost, shotcrete was the most expensive at IDR 4,331,068,967.23, followed by geomat (IDR 2,734,025,024.50) and cocomesh (IDR 906,745,000.00). However, shotcrete also required the longest construction time (30 days) compared to geomat (20 days) and cocomesh (16 days). Shotcrete provides the best technical performance for slope stability, but geomat and cocomesh are more efficient alternatives in terms of cost and time, offering a balanced solution for slope reinforcement projects.
Digital Based Estimation of Residential Property Losses from Liquefaction in West Jakarta Maryati, Indah; Zaki, Muhammad; Pontan, Darmawan; Widiarso, Tulus
Technomedia Journal Vol 10 No 2 (2025): October
Publisher : Pandawan Incorporation, Alphabet Incubator Universitas Raharja

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33050/tmj.v10i2.2500

Abstract

Liquefaction poses a significant threat to urban areas with water-saturated alluvial soils, especially in seismically active zones like West Jakarta. Using Cone Penetration Test (CPT) data from 25 locations, soil susceptibility was evaluated through Cyclic Stress Ratio (CSR), Cyclic Resistance Ratio (CRR), and Magnitude Scaling Factor (MSF). Areas with safety factor (FS) values below 1 were identified as having high liquefaction potential. Residential buildings were categorized by floor area and assessed using the 2024 Government Property Sales Value (NJOP) to estimate potential financial loss. Structural damage percentages were determined using seismic intensity thresholds and empirical damage functions. Analysis showed that residential areas with moderate to loose soil conditions, particularly in the northern and western zones, are most vulnerable. The total estimated loss reached IDR 189.8 billion, with the highest concentration of damage in medium and large sized residential properties. These findings emphasize the critical need to integrate geotechnical parameters into spatial risk mapping and urban disaster mitigation planning. A digital loss estimation model combining soil characteristics, seismic parameters, and economic valuation provides a scalable approach for early warning systems and resilience-oriented urban planning. The study contributes to data-driven risk management strategies aligned with sustainable development objectives and adaptive infrastructure policies.
Co-Authors Agus Budi Purnomo Antoni, Febri Ardilla Jefri Karista Bambang Endro Yuwono Canthika Nada Endah Kurniyaningrum Fabyanto, Ikhsan Fadly, Noer Fajar Isnaini, Rohimah Fajar, Isma Fatmawati, Nur Aziziyah Inavonna, Inavonna Irawandi, Veby Ischak, Mohammad Kardiani, Rani Khansseler, Gery Lili Kusumawati Maryati, Indah Muhammad Zaki Nityasa Kirana, Kinantya Nur Syah, Azzahra Pontan, Darmawan Pribadi, I Gede Oka Sindhu Purnomo, Endhi Ibuhindar Rahma Ningsih , Nisrina Reza Fauzi Rintawati, Dewi Rose, Ugahari Saihul Anwar Saihul Anwar Salman, Salman - Salsabilla Sari, Christina Sindhu Pribadi , I.G Oka Sugeng Riyanto Sugeng Riyanto Suhartini Suhartini Susetyarto, Martinus Bambang Syamsiar, Syamsiar Tundono, Sri Wibawa, Ilham Akbar Mulya Wijayanto , Punto Wildan, Dwiki Zayadi, Ruwaida