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All Journal Interdisciplinary Social Studies
Ria Asih Aryani Soemitro
Institut Teknologi Sepuluh Nopember, Indonesia
Environmental Science Languange, Linguistic, Communication & Media Public Health Social Sciences

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Numerical Validation of Differential Settlement in the Transition Zone of Embankment-Slab on Pile Over Soft Soils Hanifan Ihsani; Trihanyndio Rendy Satrya; Ria Asih Aryani Soemitro
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.v5i1.982

Abstract

Differential settlement in the transition zone between embankment segments and rigid structures such as Slab-on-Pile is one of the most critical issues in toll road construction on soft soil, as it may reduce ride comfort, safety, and service life. In the Serang–Panimbang Toll Road Section III Project, the applied ground treatment method consists of Free Draining Granular Material (FDGM) supporting the approach embankment and bored piles as the abutment foundation for the Slab-on-Pile system. This study aims to evaluate the performance of the existing treatment method by comparing settlement predictions derived from one-dimensional analytical methods (Terzaghi’s theory for embankments and the Boussinesq and Poulos–Davis methods for abutments) with two-dimensional numerical modeling using PLAXIS. The resulting settlement profile in the transition zone is then analyzed to assess the potential for differential settlement with respect to the applicable serviceability limits. The validation results show a strong agreement between analytical and numerical methods, with settlement deviations of 6.09% for the embankment and 4.93% for the abutment. Nevertheless, the embankment over FDGM experiences a total settlement of 51.90 cm, while the Slab-on-Pile abutment settles only 6.10 cm, producing a differential settlement of 45.80 cm, far exceeding the allowable limit. These findings indicate that the use of FDGM alone is insufficient to accommodate the high compressibility of the thick soft soil deposit at the study location.
Analysis of Lateral Shifting of Slab on Pile on Soft Soil in Coastal Area Friendly Alexander Ambarita; Trihanyndio Rendy Satrya; Ria Asih Aryani Soemitro
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.v5i1.1003

Abstract

This study discusses the settlement and lateral displacement of piles on a toll road built on saturated soft soil in a coastal area. The case study focuses on the point where the off-ramp and main road meet, with soil conditions dominated by very soft clay to a depth of ±58 m (N-SPT <10), meaning the piles function primarily as friction piles. Soil data from the BH-03 drill were processed through N-SPT correction, consistency grouping, and compressibility parameter correlation to obtain input for numerical modeling. The modeling was done using PLAXIS 2D under plane strain conditions, with the Soft Soil model for clay and Mohr–Coulomb for non-cohesive soil. Construction stages included 2.5 m of backfilling, two years of consolidation, and the installation of new piles near existing piles. The results showed that the vertical settlement of the pile tip from the numerical model was 3.9 cm, closely matching the analytical calculation results (3.07–3.66 cm), which is still within the SNI 8460 serviceability criteria. However, the lateral displacement reached 5–5.7 cm, exceeding the SNI limit of <2.5 cm. Horizontal displacement contours revealed a 6.3–10.1 cm soil shift toward the outside of the slope during new pile construction, indicating that long-term consolidation, embankment slope geometry, and seabed slope are the main causes of lateral deformation.
Co-Authors Friendly Alexander Ambarita Hanifan Ihsani Trihanyndio Rendy S, Trihanyndio Rendy Trihanyndio Rendy Satrya