Muttaqin, Teguh Sakti (2026) Analisis Efektivitas Mortar Busa Dan Expanded Polystyrene (EPS) Geofoam Sebagai Material Timbunan Ringan Di Atas Tanah Lunak Studi Kasus: Pembangunan Jalan Tol Betung-Tempino-Jambi Seksi 1B STA 55+900. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Proyek pembangunan Jalan Tol Trans Sumatera (JTTS) ruas Betung–Tempino–Jambi Seksi 1B STA 55+900 menghadapi tantangan geoteknik berupa rencana timbunan setinggi 6,6 meter di atas tanah lempung lunak sedalam 4,45 meter. Lokasi ini berada di dataran banjir dengan risiko muka air banjir mencapai elevasi +10,27 m. Kondisi tersebut memicu risiko penurunan berlebihan dan ketidakstabilan lereng. Penelitian ini bertujuan menganalisis efektivitas material timbunan ringan (Mortar Busa dan EPS Geofoam) dengan variasi ketebalan (25%, 50%, dan 75%) menggunakan simulasi numerik Plaxis 2D. Hasil penelitian menunjukkan bahwa desain eksisting (Replacement 2 m) memiliki Faktor Keamanan (SF) stabilitas sebesar 1,307 yang belum memenuhi standar minimum (SF > 1,5), dengan total penurunan sebesar 0,385 m. Penerapan material ringan terbukti meningkatkan stabilitas dan mereduksi penurunan secara signifikan. Variasi 75% Geofoam memberikan performa teknis terbaik dengan menghasilkan reduksi penurunan paling optimal menjadi 0,232 m (berkurang 39,7%) serta mencapai SF stabilitas tertinggi sebesar 2,572. Berdasarkan analisis multikriteria, kombinasi Replacement 2 meter + 75% Geofoam ditetapkan sebagai konfigurasi paling optimal dengan skor tertinggi 15,00 karena memberikan keseimbangan terbaik antara stabilitas lereng, kontrol penurunan, dan keamanan terhadap gaya angkat (uplift) hidrostatik banjir. Seluruh variasi memenuhi kriteria laju penurunan teknis (< 2 cm/tahun).
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The Trans-Sumatra Toll Road (JTTS) construction project, specifically the Betung–Tempino–Jambi section 1B at STA 55+900, faces geotechnical challenges regarding a planned 6.6-meter high embankment overlying a 4.45-meter deep soft clay layer. The site is situated in a floodplain with a potential flood water level reaching an elevation of +10.27 m. These conditions pose risks of excessive settlement and slope instability. This study aims to analyze the effectiveness of lightweight fill materials (Foamed Mortar and EPS Geofoam) with varying thicknesses (25%, 50%, and 75%) utilizing Plaxis 2D numerical simulation. The results indicate that the existing design (2 m Replacement) has a stability Safety Factor (SF) of 1.307, which fails to meet the minimum standard (SF > 1.5), and results in a total settlement of 0.385 m. The application of lightweight materials demonstrated significant improvements in stability and settlement reduction. The 75% Geofoam variation yielded the superior technical performance, achieving the most optimal settlement reduction to 0.232 m (a 39.7% decrease) and the highest stability SF of 2.572. Based on multi-criteria analysis, the combination of 2-meter Replacement + 75% Geofoam was identified as the optimal configuration, achieving the highest score of 15.00. This configuration provides the best balance between slope stability, settlement control, and safety against hydrostatic flood uplift forces. All variations met the technical settlement rate criteria (< 2 cm/year).
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Soft soil, lightweight foamed mortar, EPS geofoam, stability, settlement, Tanah lunak, Material Ringan, Mortar Busa, EPS Geofoam, Stabilitas, Penurunan. |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization |
| Divisions: | Faculty of Civil Engineering and Planning > Civil Engineering > 22101-(S2) Master Thesis |
| Depositing User: | Teguh Sakti Muttaqin |
| Date Deposited: | 26 Jan 2026 06:50 |
| Last Modified: | 26 Jan 2026 06:50 |
| URI: | http://repository.its.ac.id/id/eprint/130358 |
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