Perencanaan Timbunan, Shore Protection, Dan Pondasi Untuk Tangki Timbun LFO Pada Pembangunan PLTMG 50 MW Manokwari

Musyaffa, Muhammad Alim (2026) Perencanaan Timbunan, Shore Protection, Dan Pondasi Untuk Tangki Timbun LFO Pada Pembangunan PLTMG 50 MW Manokwari. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pembangunan Pembangkit Listrik Tenaga Mesin dan Gas (PLTMG) 50 MW di Manokwari memerlukan perencanaan struktur pendukung yang aman dan stabil, khususnya untuk tangki timbun Liquid Fuel Oil (LFO) berdiameter 50 meter dan tinggi 25 meter. Lokasi proyek berada di kawasan pesisir dengan kondisi tanah pasir yang berpotensi mengalami likuefaksi akibat gempa. Studi ini bertujuan merencanakan timbunan, struktur shore protection, dan pondasi tangki timbun, serta mengevaluasi potensi likuefaksi tanah dasar. Apabila potensi likuefaksi teridentifikasi, dilakukan perbaikan tanah menggunakan metode vibro compaction. Perencanaan ini diharapkan menghasilkan sistem struktur yang stabil dan aman guna mendukung operasional PLTMG 50 MW Manokwari. Berdasarkan analisis, lokasi studi menunjukkan kerentanan terhadap likuefaksi, didapatkan pada Zona 1 dan 2 hingga kedalaman 9 meter, dan kedalaman 24 meter di Zona 3. Oleh karena itu, tugas akhir ini difokuskan pada perencanaan dan perancangan infrastruktur pendukung yang aman dan stabil, diawali dengan remediasi tanah dasar menggunakan metode vibro compaction. Perbaikan ini dirancang dengan pola segitiga, target peningkatan kerapatan relatif (DR%) sebesar 80%, dengan vibroflot dengan jarak antar titik 1,85 meter. Hasil implementasi perbaikan ini divalidasi melalui analisis stabilitas lereng (slope stability) pada timbunan setinggi 2,12 meter, menghasilkan faktor keamanan (SF) lebih dari 1,5 dengan kondisi tanpa gempa, dan pada kondisi gempa didapatkan faktor keamanan < 1,1 sehingga direncanakan perkuatan dengan cerucuk berdiameter 40 cm dengan panjang 7 meter sebanyak 3680 buah untuk 334 meter panjang shore protection. yang mengonfirmasi bahwa timbunan menjadi aman terhadap potensi kegagalan geser (kelongsoran). Selain itu, fondasi tangki dirancang sebagai pondasi tikar dengan ketebalan 1,3 meter di atas area 2704 m^2, diperkuat dengan tulangan utama berdiameter 25 mm dengan spasi 200 mm. Perencanaan turut mencakup perlindungan pantai (shore protection) dalam bentuk struktur revetment dengan kemiringan 1:2 dan elevasi puncak + 5,12 meter , menggunakan Primary Layer (berat batu 287,96 kg, tebal 1 m), Secondary Layer (berat batu 28,8 kg, tebal 0,5 m), Inti (berat batu 1,44 kg), dan Toe Protection (berat batu 7,68 kg, tebal 0,9 m). Secara keseluruhan, perencanaan terintegrasi ini berhasil memastikan stabilitas timbunan, fondasi, dan perlindungan pantai agar PLTMG dapat beroperasi secara aman dan efisien.
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The development of a 50 MW Gas and Engine Power Plant (PLTMG) in Manokwari requires the planning of safe and stable supporting structures, particularly for a Liquid Fuel Oil (LFO) storage tank with a diameter of 50 meters and a height of 25 meters. The project site is located in a coastal area with sandy soil conditions that are potentially susceptible to earthquake-induced liquefaction. This study aims to design the embankment, shore protection structure, and storage tank foundation, as well as to evaluate the liquefaction potential of the subsoil. When liquefaction potential is identified, ground improvement is implemented using the vibro compaction method. This planning is expected to produce a stable and safe structural system to support the operation of the 50 MW Manokwari PLTMG. Based on the analysis, the study area shows vulnerability to liquefaction in Zones 1 and 2 up to a depth of 9 meters, and up to a depth of 24 meters in Zone 3. Therefore, this final project focuses on the planning and design of safe and stable supporting infrastructure, initiated with subsoil remediation using the vibro compaction method. The improvement is designed in a triangular pattern, targeting an increase in relative density (DR%) of 80%, using a vibro float with a point spacing of 1.85 meters. The implementation results are validated through slope stability analysis of an embankment with a height of 2.12 meters, yielding a Safety Factor (SF) greater than 1.5, confirming that the embankment is safe against potential shear failure. Under seismic conditions, the safety factor was found to be less than 1.1. Consequently, reinforcement has been designed using 3680 micro-piles, each 40 cm in diameter and 7 meters in length, to stabilize a 334-meter stretch of shore protection.. In addition, the tank foundation is designed as a raft foundation with a thickness of 1,3 meters over an area of 2704 m², reinforced with main reinforcement bars of 25 mm diameter at 200 mm spacing. The planning also includes shore protection in the form of a revetment structure with a slope of 1:2 and a crest elevation of +5.12 meters, utilizing a Primary Layer (stone weight 287.96 kg, thickness 1 m), Secondary Layer (stone weight 28.8 kg, thickness 0.5 m), Core (stone weight 1.44 kg), and Toe Protection (stone weight 7.68 kg, thickness 0.9 m). Overall, this integrated planning ensures the stability of the embankment, foundation, and coastal protection to enable the PLTMG to operate safely and efficiently.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Likuefaksi, PLTMG, Pondasi Tangki Timbun LFO, Shore Protection, Timbunan Embankment, Foundation, Liquefaction, PLTMG, Shore Protection
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA775 Foundations.
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22201-(S1) Undergraduate Thesis
Depositing User:	Musyaffa Muhammad Alim
Date Deposited:	22 Jan 2026 04:39
Last Modified:	22 Jan 2026 04:39
URI:	http://repository.its.ac.id/id/eprint/130081

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