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All Journal Interdisciplinary Social Studies Jurnal Indonesia Sosial Teknologi
Trihanyndio Rendy Satrya
Institut Teknologi Sepuluh Nopember, Indonesia
Computer Science & IT Economics, Econometrics & Finance Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Public Health Social Sciences

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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.
Analysis of the impact of dam slope modifications on the sensitivity to rapid drawdown, earthquakes, and changes in water level at the Jragung Dam in Semarang Regency Rizal Undityo Rahardani; Trihanyndio Rendy Satrya
Jurnal Indonesia Sosial Teknologi Vol. 5 No. 7 (2024): Jurnal Indonesia Sosial Teknologi
Publisher : Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/jist.v5i7.1265

Abstract

Urugan-type dams are the most common type of dam to work on in Indonesia, with a material composition that is easy to obtain and relatively more economical. Based on the results of slope stability, a sensitivity analysis will be carried out based on changes in slope slope to post-construction conditions, during reservoir operation water level and rapid drawdown conditions. In this study, we will analyze the changes in the value of safety factors that occur on the slope of the body of the Jragung Dam due to rapid drawdown events and seismicities (OBE and MDE) using the help of seepage analysis calculation software and slope stability. There are three models used, namely Model 1 using geometry according to DED (slope of upstream slope 1: 3.0 and slope of downstream slope 1: 2.5), Model 2 of using modification of field construction geometry (slope of upstream slope 1: 2.5 and slope of downstream slope 1: 2.5), Model 3 of using modification of field construction geometry (slope of upstream slope 1: 2.5 and slope of downstream slope 1: 2,25). From the three models, the initial stage will be processed to find the phreatic line on the dam body when drawdown and the next stage to find the value of the dam slope safety factor. After the overall analysis was carried out both in terms of seepage analysis and stability analysis of the three simulation models, for the construction in the field on the Jragung dam, the 3rd Model can be used, namely the proposed geometric modification with an upstream slope of 1: 2.5 and a downstream slope of 1: 2.25, and material parameters according to the availability specifications at the work site. Regarding the stability of the slope, it is noted that at the time of the MDE earthquake load of 10,000 years, when the rapid-drawdown conditions y/h = 0.5h and y/h = 0.75h there is a possibility that the Jragung dam will be damaged, but not collapsed.
Co-Authors Friendly Alexander Ambarita Ria Asih Aryani Soemitro Rizal Undityo Rahardani