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Roesyanto
Universitas Sumatera Utara
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Analisis Pengaruh Preloading Kombinasi Prefabricated Vertical Drain pada Proses Konsolidasi di Proyek Reklamasi di Samping Tangki Cpo Antar Pulau Belawan Berdasarkan Bore Log Bh-2) Muhammad Fadhil Lubis; Roesyanto; Gina Cynthia Raphita Hasibuan
Jurnal Syntax Admiration Vol. 4 No. 8 (2023): Jurnal Syntax Admiration
Publisher : Syntax Corporation Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46799/jsa.v4i8.681

Abstract

To carry out construction on soft soil, cases of land subsidence are often encountered. This is due to the low bearing capacity and small shear force, large compression, and very small permeability. To address this problem, one method that can be implemented is soil improvement using preloading and Prefabricated Vertical Drain (PVD). The aim of this research is to find out the magnitude of consolidation settlement by using analytical methods and by using PLAXIS 2D modeling at reclamation project locations besides CPO tanks between Belawan Islands based on Bore Log BH-02 data. It is also to compare coarse mesh, medium mesh, and fine mesh in PLAXIS 2D modeling, and to obtain the amount of land subsidence using preloading only and preloading with a combination of preloading and Prefabricated Vertical Drain (PVD) based on Bore Log BH-02 points. From the analytical results obtained a decrease of 1.254 meters. While the PLAXIS 2D modeling uses a medium mesh that has been combined with a PVD of 1.268 meters. This means that the results of the settlement by modeling using PLAXIS 2D are closer to the SP-02 settlement plate data of 1.270 meters. The settlement uses PLAXIS 2D with a coarse mesh of 1,266 meters and a fine mesh of 1,282 meters. While modeling using preloading only obtained a decrease of 0.340 meters. It can be concluded that the results of modeling using PLAXIS 2D in using medium mesh that has been combined with PVD are relatively closer to settlement data in the field with a percentage difference of 0.142% settlement plate SP-02 settlement.
Evaluation of Soil Stiffness Parameters for Bored Pile Analysis Using Finite Element Method and Load–Settlement Curves Wawan Azwansyah; Roesyanto; Syiril Erwin Harahap
Jurnal Ilmiah Dinamika Rekayasa Vol. 22 No. 2 (2026): Jurnal Ilmiah Dinamika Rekayasa - Juli
Publisher : Engineering Faculty, UNSOED

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jidr.2026.22.2.121

Abstract

Determining soil stiffness parameters is essential in bored pile analysis using the finite element method because they strongly influence deformation predictions. This study evaluates the stiffness parameters of the Hardening Soil constitutive model by validating numerical results against Static Load Test (SLT) load–settlement curves. Soil parameters were derived from field investigation data, laboratory testing, and empirical correlations, including c′ from Standard Penetration Test (SPT) values, ϕ′ from the plasticity index, Eoed and Eur from consolidation tests, and E50 from correlation with Eoed. Validation was performed using the Mean Absolute Percentage Error (MAPE) based on the gradients of the load–settlement curve during each loading phase. The results show that MAPE consistently decreased with increasing loading cycles and reached the highly accurate category (MAPE < 10%) in the final loading cycle. The gradient-based evaluation indicates that E50 does not fully represent the initial loading response, whereas Eoed and Eur adequately represent soil stiffness under higher stress levels and during the unloading–reloading phases. The proposed approach provides a more comprehensive framework for evaluating soil stiffness parameters in the Hardening Soil constitutive model than validation based only on total deformation.
Co-Authors Gina Cynthia Muhammad Fadhil Lubis Syiril Erwin Harahap Wawan Azwansyah