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All Journal Interdisciplinary Social Studies
Yudhi Lastiasih
Institut Teknologi Sepuluh November
Environmental Science Languange, Linguistic, Communication & Media Public Health Social Sciences

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Journal : Interdisciplinary Social Studies

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Numerical Analysis of EPS Geofoam as Lightweight Embankment Fill on Soft Soil: Case Study of Patimban Access Toll Road, Package 3 Akhmad Fauzi Al Afif; Yudhi Lastiasih; Herman Wahyudi
Interdisciplinary Social Studies Vol. 5 No. 1 (2025): Regular Issue: October-December 2025
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/iss.v5i1.1004

Abstract

The construction of the Patimban Port Access Toll Road faces significant geotechnical challenges due to the presence of thick soft soil layers characterized by low bearing capacity and high compressibility. Conventional soil embankments constructed on such ground conditions may induce excessive settlement and require a long consolidation period. This study aims to evaluate the effectiveness of Expanded Polystyrene (EPS) Geofoam as an alternative lightweight embankment material through numerical analysis using PLAXIS 2D. Four embankment configurations were analyzed: conventional embankment with initial preloading and composite embankments incorporating EPS Geofoam with thicknesses of 1 m, 2 m, and 3 m. The evaluation parameters include vertical settlement magnitude, consolidation time, and deformation patterns at key observation points, namely the center line, embankment toe, and critical settlement point beneath the embankment. The results indicate that the application of EPS Geofoam significantly reduces vertical settlement compared to the conventional embankment. Settlement reduction exceeding 85% was achieved for Geofoam thicknesses of 2 m and 3 m, accompanied by accelerated consolidation stabilization within less than 140 days. Increasing Geofoam thickness effectively reduces settlement but may induce uplift at the embankment toe due to lateral stress redistribution. Overall, EPS Geofoam with a thickness of 2–3 m provides the most optimal performance in controlling settlement and accelerating soil stabilization, making it a viable lightweight embankment solution for toll road construction on soft soil, particularly in coastal areas such as Patimban.
Geotechnical Stability Analysis of Soil Displacement: A Case Study of Bridge STA 53, Serang-Panimbang Toll Road, Banten Province Brillianta Cahya Aryadi; Yudhi Lastiasih; Putu Tantri Kumala Sari
Interdisciplinary Social Studies Vol. 5 No. 1 (2025): Regular Issue: October-December 2025
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/iss.v5i1.1006

Abstract

Serang-Panimbang Toll Road Project is Project National Strategic Project (PSN) in Indonesia which is the development of Economic Zones Special (KEK) Tourism Cape Lesung. STA 53 Bridge on the Serang-Panimbang Toll Road Project face challenge stability slope consequence condition complex geotechnical engineering, in particular existence claystone formation problematic (Formation Bojong). Research This analyze causes and mechanisms shift land on site the through approach integrated. Investigation layer soil and instrumentation data field used For obtain material parameters. Analysis back -analysis with method element until (FEM) then implemented For engineer repeat failure. FEM results were validated with resistivity data from survey geoelectricity For confirm types and triggers movement land. Allegedly also reinforced with depth data shift the ground as read by the inclinometer, strengthens suspicion Where condition layer vulnerable land to weakening due to water. Study This succeed identify factor controller instability and provide key parameter recommendations For planning reinforcement slope as well as ensure security structure bridge.
Determination of Soft Soil Permeability Parameters Using Plaxis 2D Based on Settlement Plate Monitoring Data Bagas Hendi Pratama; Yudhi Lastiasih; Herman Wahyudi
Interdisciplinary Social Studies Vol. 5 No. 2 (2026): Interdisciplinary Social Studies
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/iss.v5i2.1051

Abstract

Road infrastructure development on soft soils often faces geotechnical challenges in the form of large and time-consuming settlement. Discrepancies often occur between analytical settlement predictions and actual conditions in the field. This study aims to determine valid soil permeability parameters (k) through the back calculation method using Plaxis 2D numerical modeling calibrated with settlement plate monitoring data. The research employs a quantitative analytical approach combining field monitoring, observational methods, and finite element numerical simulation to establish representative soil parameters for consolidation analysis. The research methodology includes interpretation of soil investigation data (Borlog and CPTu), prediction of final settlement using the Asaoka observation method, and finite element simulations using the Mohr-Coulomb and Hardening Soil models. Based on the analysis of the Asaoka method on monitoring data during the construction phase, the predicted final settlement (Sult) is 148.93 cm with a time to achieve a degree of consolidation of 90% (t90) of 1.27 years. The results of the Plaxis 2D simulation show an exponential relationship between the permeability value and the consolidation time. Through the back calculation analysis, the most representative soil permeability value (k) for the field conditions is 1.26 × 10?? m/day. This value validates the agreement between the numerical model and the actual consolidation behavior in the field, providing practical guidance for geotechnical engineers in soft soil design and construction monitoring.
Co-Authors Akhmad Fauzi Al Afif Bagas Hendi Pratama Brillianta Cahya Aryadi Herman Wahyudi Herman Wahyudi Putu Tantri Kumala Sari