Analisis Penggunaan Geofoam sebagai Pengganti Timbunan Tanah pada Akses Toll Patimban Paket 3 STA 28+000 s/d 33+500

Al Afif, Akhmad Fauzi (2026) Analisis Penggunaan Geofoam sebagai Pengganti Timbunan Tanah pada Akses Toll Patimban Paket 3 STA 28+000 s/d 33+500. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pembangunan Jalan Tol Akses Patimban menghadapi tantangan kondisi tanah dasar berupa lapisan tanah lunak dengan daya dukung rendah dan tingkat kompresibilitas tinggi. Penggunaan timbunan tanah konvensional pada kondisi tersebut berpotensi menimbulkan penurunan yang besar serta waktu konsolidasi yang panjang. Penelitian ini bertujuan untuk mengevaluasi efektivitas penggunaan Geofoam EPS sebagai alternatif timbunan ringan melalui analisis numerik menggunakan perangkat lunak PLAXIS 2D. Analisis dilakukan pada empat variasi model timbunan, yaitu timbunan konvensional (initial preloading) dan timbunan komposit dengan Geofoam EPS-19 setebal 1 meter, 2 meter, dan 3 meter. Parameter evaluasi meliputi besarnya penurunan vertikal (U_y), waktu konsolidasi, serta pola deformasi pada beberapa titik pengamatan, yaitu center line, kaki timbunan, dan titik deformasi maximum di area timbunan. Hasil analisis menunjukkan bahwa penggunaan Geofoam EPS secara signifikan mampu mereduksi penurunan tanah dasar dibandingkan dengan timbunan konvensional. Reduksi penurunan vertikal mencapai lebih dari 85% pada variasi Geofoam dengan ketebalan 2 meter dan 3 meter. Peningkatan ketebalan Geofoam efektif dalam mengurangi penurunan, namun masih ada deformasi positif pada area kaki timbunan akibat redistribusi tegangan lateral. Berdasarkan hasil analisis, penggunaan Geofoam EPS-19 dengan ketebalan 1 meter dinilai memberikan manfaat paling optimal dalam mengendalikan penurunan dan mempercepat stabilisasi tanah.
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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. Increasing Geofoam thickness effectively reduces settlement but may induce deformasi positif 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.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Geofoam, tanah lunak, penurunan, stabilitas lereng, timbunan ringan, Tol Patimban, analisis numerik. EPS Geofoam, Lightweight Embankment, Soft Soil, Settlement, Numerical Analysis, PLAXIS 2D
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA439 Lightweight concrete. High strength concrete. T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction) T Technology > TE Highway engineering. Roads and pavements > TE175 Road and highway design
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	Akhmad Fauzi Al Afif
Date Deposited:	26 Jan 2026 08:38
Last Modified:	26 Jan 2026 08:38
URI:	http://repository.its.ac.id/id/eprint/130530

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