Asrinia Desilia
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Analysis of Soil Improvement Through PVD and Vacuum Preloading with Several Equivalent Permeability Methods Gusnadi, Zakwan; Iman Handiman; Herwan Dermawan; Asrinia Desilia
Indonesian Geotechnical Journal Vol. 3 No. 1 (2024): Vol. 3, No. 1, April 2024
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56144/igj.v3i1.92

Abstract

Vacuum preloading combined with prefabricated vertical drain (PVD) is one of the common soft soil improvement methods. Soft soils often pose significant problems in construction projects due to their low shear strength and high compressibility, leading to settlement issues and potential structural instability. The PVD combined with vacuum preloading method addresses these problems by accelerating the consolidation process and minimizing settlement during service period. The acceleration occurs due to the presence of PVD, allowing dissipation of excess pore water in horizontal direction towards the PVD. Thereafter, the water in the PVD is drained to the surface. When modelled in 2D, PVD behaves as a continuous drain in the plane strain direction, causing the flow conditions to deviate from the actual conditions. To address this issue, equivalent soil permeability values is required, allowing the 2D model to produce results closely resembling the actual conditions. This research explores the improvement of PVD vacuum preloading through three equivalent permeability approaches. Utilizing field monitoring data, which includes settlement measurements from settlement plates, changes in pore water pressure recorded by piezometers, and lateral deformation data captured by inclinometers, the study evaluates the effectiveness of these approaches. Comparative analyses with field monitoring data reveal that Indraratna equivalent permeability method has the best fit. The integration of PVD and vacuum preloading, coupled with the refinement of equivalent permeability methodologies, offers a promising solution for addressing soft soil problems in geotechnical engineering. This research contributes to the practical application of these methods in construction projects, emphasizing their potential to enhance soil stabilization and reduce settlement-related risks.
Analisis Perkuatan Timbunan pada Oprit Jembatan Menggunakan Pile Embankment Laska Aurelia Agustiana; Imam Hadiman; Zakwan Gusnadi; Asrinia Desilia
RekaRacana: Jurnal Teknik Sipil Vol 11, No 3: November 2025
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/rekaracana.v11i3.241

Abstract

ABSTRAKPembangunan timbunan oprit jembatan di atas tanah lunak sering dihadapkan dengan permasalahan penurunan berlebih dan ketidakstabilan timbunan, sehingga dapat membahayakan pengguna jalan serta menimbulkan kerusakan struktural. Penelitian ini bertujuan untuk menganalisis efektivitas metode perkuatan timbunan menggunakan pile embankment dibandingkan dengan timbunan tanpa perkuatan pada jalan Tol Trans Sumatera. Kondisi tanah dasar menunjukkan tanah lempung sedalam 10 meter dengan konsistensi medium hingga stiff dan tanah pasir sedalam 10 meter dengan konsistensi medium dense hingga very dense, serta kelas situs termasuk tanah lunak (SE). Data primer berupa uji SPT dengan analisis numerik menggunakan FEM 2D. Hasil analisis timbunan tanpa perkuatan menunjukkan penurunan sebesar 40,99 cm dalam waktu 5,353 tahun dengan konsolidasi 99%; mengalami kelongsoran dengan bentuk circle tipe deep sliding pada lapisan tanah pertama akibat beban lalu lintas. Sedangkan penggunaan perkuatan pile embankment dengan tiang spun pile diameter 60 cm; Load Transfer Platform (LTP) setebal 60 cm; dan penggunaan geogrid dapat mereduksi penurunan hingga 85,9%. Serta, faktor keamanan untuk kondisi statik sebesar 3,035 dan kondisi gempa sebesar 1,201. Sistem perkuatan pile embankment efektif mengatasi masalah penurunan dan stabilitas pada infrastruktur yang berdiri di atas tanah lunak.Kata kunci: Pile Embankment, Penurunan Konsolidasi, Stabilitas Lereng, Timbunan Oprit ABSTRACTThe construction of bridge approach embankments built on soft soil is often faced with problems of excessive settlement and embankment instability, can endanger road users and cause structural damage to bridge approaches. This research aims to analyze the effectiveness of embankment reinforcement methods using pile embankment compared to unreinforced embankments on the Trans Sumatera Toll Road. The subsoil conditions show a clay layer 10 meters deep with medium to stiff consistency and a sand layer 10 meters deep with medium dense to very dense consistency, with site class as soft soil (SE). Primary data from SPT tests and numerical analysis using 2D FEM. The results of unreinforced embankment analysis show settlement of 40.99 cm over 5.353 years with 99% consolidation, and the embankment experiences failure with a circular-type deep sliding pattern in the first soil layer due to traffic loads. Meanwhile, the use of pile embankment reinforcement using spun pile with 60 cm diameter, Load Transfer Platform (LTP) with 60 cm thickness, and the use of geogrid can reduce settlement by up to 85.9%. The safety factor for static conditions is 3.035 and for earthquake conditions is 1.201. The pile embankment reinforcement system is effective in addressing settlement and stability problems in infrastructure built on soft soil.Keywords: work-life balance, construction, construction worker, literature review