Pua, Friska Alfira Taqwani (2026) Alternatif Perencanaan Timbunan dengan Penggunaan Campuran FABA Sebagai Material Timbunan Studi Kasus: Jalan Tol Probolinggo-Banyuwangi Interchange Besuki Zona A4 dan A5. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pembangunan Jalan Tol Probolinggo-Banyuwangi segmen Interchange Besuki, khususnya di Zona A4 dan A5, dihadapkan pada tantangan tanah dasar lunak yang berisiko menyebabkan pemampatan jangka panjang dan ketidakstabilan lereng pada timbunan tinggi (4-11 meter). Di sisi lain, terdapat peluang pemanfaatan limbah Fly Ash dan Bottom Ash (FABA) dari PLTU Paiton untuk mengatasi potensi kelangkaan material timbunan konvensional. Penelitian ini bertujuan menganalisis perbandingan kinerja geoteknik dan efisiensi biaya antara timbunan sirtu dengan variasi campuran FABA. Metode penelitian menggunakan analisis komparatif tiga variasi material (sirtu, FABA 30:30:40, dan FABA 40:40:20) mencakup perhitungan besar dan waktu pemampatan, analisis laju penurunan, perbaikan tanah Preloading kombinasi Prefabricated Vertical Drain (PVD), stabilitas lereng, serta estimasi biaya. Hasil penelitian menunjukkan bahwa penggunaan material FABA menghasilkan penurunan total sedikit lebih besar (0,47–0,89 m) dibandingkan sirtu (0,46–0,83 m) akibat berat isi yang lebih tinggi. Zona A4 teridentifikasi lebih kritis dengan waktu pemampatan alami mencapai 26,7 tahun akibat single drainage, jauh lebih lama dibandingkan Zona A5 yang hanya 4,1 tahun. Dari hasil analisis, didapatkan laju pemampatan awal melebihi standar Bina Marga (kurang dari 2 cm/tahun dan 10 cm/10 tahun), maka diperlukan percepatan konsolidasi menggunakan PVD dengan perencanaan yang paling efisien menggunakan pola segitiga sedalam lapisan lunak (10 m di Zona A4 dan 9 m di Zona A5) dengan spasi 1,2 m untuk Zona A4 dan 1,4 m untuk Zona A5. Analisis stabilitas membuktikan material FABA jauh lebih unggul dengan Safety Factor (SF) > 1,5 tanpa perkuatan berkat parameter kohesi dan sudut geser tinggi, sedangkan timbunan sirtu memerlukan perkuatan geotekstil hingga 35 lapis untuk variasi timbunan tertinggi. Dari segi biaya, campuran FABA 30:30:40 terbukti paling efisien dengan penghematan biaya mencapai Rp3,22 Miliar (28%) pada variasi timbunan tertinggi. Disimpulkan bahwa kombinasi FABA 30:30:40 dengan perbaikan tanah PVD adalah alternatif paling optimal karena unggul secara geoteknik dan ekonomi.
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The construction of the Probolinggo-Banyuwangi Toll Road in the Besuki Interchange segment, particularly in Zones A4 and A5, faces significant geotechnical challenges due to soft subgrade, which poses risks of long-term settlement and slope instability for high embankments (4–11 meters). Conversely, there is an opportunity to utilize Fly Ash and Bottom Ash (FABA) waste from the Paiton Power Plant to address the potential scarcity of conventional embankment materials. This study aims to analyze the comparative geotechnical performance and cost-efficiency between conventional sand-gravel (sirtu) embankments and various FABA mixtures. The research methodology employs a comparative analysis of three material variations (sirtu, FABA 30:30:40, and FABA 40:40:20), encompassing calculations of settlement magnitude and duration, rate of settlement analysis, ground improvement design using Preloading combined with Prefabricated Vertical Drains (PVD), slope stability analysis, and cost estimation. The results indicate that the use of FABA material results in slightly larger total settlement (0.47–0.89 m) compared to sirtu (0.46–0.83 m) due to its higher unit weight. Zone A4 was identified as more critical, with a natural consolidation time reaching 26.7 years due to single drainage conditions, significantly longer than Zone A5, which requires only 4.1 years. Analysis revealed that the initial rate of settlement exceeded Bina Marga standards (less than 2 cm/year and 10 cm/10 years); therefore, consolidation acceleration using PVD is necessary. The most efficient design utilizes a triangular pattern extending to the depth of the soft soil layer (10 m in Zone A4 and 9 m in Zone A5) with a spacing of 1.2 m for Zone A4 and 1.4 m for Zone A5. Stability analysis demonstrates that FABA material is superior, achieving a Safety Factor (SF) > 1.5 without reinforcement due to high cohesion and friction angle parameters, whereas sirtu embankments require geotextile reinforcement of up to 35 layers for the highest embankment variation. In terms of cost, the FABA 30:30:40 mixture proved to be the most efficient, offering cost savings of up to Rp3.22 billion (28%) for the highest embankment variation. It is concluded that the combination of FABA 30:30:40 with PVD ground improvement is the most optimal alternative, excelling in both geotechnical performance and economic efficiency.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Jalan tol Probolinggo-Banyuwangi, FABA, Geotekstil, PVD =================================================================================================================================== Probolinggo-Banyuwangi Toll Road, FABA, Geotextile, PVD |
| Subjects: | T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22201-(S1) Undergraduate Thesis |
| Depositing User: | Friska Alfira Taqwani Pua |
| Date Deposited: | 27 Jan 2026 03:34 |
| Last Modified: | 27 Jan 2026 03:34 |
| URI: | http://repository.its.ac.id/id/eprint/130510 |
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