Perencanaan Dinding Saluran serta Alternatif Dinding dan Pondasi Kolam Tampungan pada Infrastruktur Water Intake PLTU Sumbawa Barat

Wanda, Em Syahdu Aflahis Salam El (2025) Perencanaan Dinding Saluran serta Alternatif Dinding dan Pondasi Kolam Tampungan pada Infrastruktur Water Intake PLTU Sumbawa Barat. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

PLTU Sumbawa Barat mengalami gangguan operasional akibat sedimentasi pasir pada salah satu unit pipa water intake yang menyebabkan penurunan kinerja kondensor dan kehilangan produksi listrik. Untuk mengatasi masalah ini, PLN merencanakan perubahan desain saluran menjadi sistem open channel dengan lebar 6 meter dan tinggi 5–10 meter, serta penambahan dua kolam tampungan menggunakan pondasi mini pile dan dinding kolam diperkuat dengan continuous pile. Evaluasi dan perencanaan dalam tugas akhir ini mempertimbangkan gaya angkat (uplift), stabilitas struktur, daya dukung tanah, kegagalan geser dan guling, serta potensi likuefaksi. Hasil evaluasi menunjukkan bahwa dinding penahan eksisting tipe pile curtain tidak memenuhi syarat kestabilan berdasarkan analisis manual maupun perangkat lunak. Alternatif saluran dirancang menggunakan sheet pile baja tipe AZ 40-700N dengan sistem bracing horizontal. Terdapat tiga variasi: (1) kedalaman galian 5,7 m, sheet pile 15 m, dengan 1 strut pada 2 m; (2) kedalaman 7,8 m, sheet pile 19 m, dengan 2 strut pada 2 m dan 7 m; (3) kedalaman 11,4 m, sheet pile 23 m, dengan 2 strut pada 2 m dan 10 m. Struktur kolam tampungan dirancang menggunakan beton bertulang tipe kantilever rigid body dengan dimensi kolam 11,5 × 11,5 m, dinding non-uniform (bawah 1,45 m, atas 0,5 m), dan slab bawah 17,5 × 17,5 m tebal 1,4 m. Perencanaan dinyatakan aman terhadap uplift, guling, geser, daya dukung, dan stabilitas. Pada struktur kolam tampungan pile 12 meter direncanakan berjarak 3 × 3 meter di slab bawah untuk mendistribusikan beban dan mengurangi momen lentur pelat. Metode pelaksanaan mencakup cofferdam sheet pile di sisi laut saluran dan turap sheet pile sementara untuk konstruksi kolam. Perencanaan ini diharapkan menjadi solusi teknis yang lebih stabil dan efisien.
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The West Sumbawa coal-fired power plant (PLTU Sumbawa Barat) experienced operational disruptions due to sand sedimentation in one of the water intake pipes, leading to reduced condenser performance and power generation losses. To address this issue, PLN planned a redesign of the intake system into an open channel with a width of 6 meters and a height of 5–10 meters, along with the addition of two storage ponds using minipile foundations and retaining walls strengthened with continuous piles. This final project includes the evaluation and redesign of the intake structure, considering uplift forces, structural stability, soil bearing capacity, sliding and overturning failure, as well as liquefaction potential. Evaluation results show that the existing pile curtain retaining structure does not meet stability requirements based on manual and software analysis. As an alternative, the channel is designed using AZ 40-700N steel sheet piles with horizontal bracing systems in three variations: (1) 5.7 m excavation depth with 15 m sheet pile and one strut at 2 m; (2) 7.8 m depth with 19 m sheet pile and two struts at 2 m and 7 m; (3) 11.4 m depth with 23 m sheet pile and two struts at 2 m and 10 m. The storage pond is designed as a reinforced concrete cantilever-type rigid body with a 11.5 × 11.5 m dimension, non-uniform wall thickness (1.45 m bottom, 0.5 m top), and a 17.5 × 17.5 m slab with 1.4 m thickness. The design is deemed safe against uplift, sliding, overturning, bearing failure, and general stability. In the basin structure, 12 meter piles are arranged in a 3 × 3 meter grid beneath the bottom slab to distribute loads and reduce slab bending moments. Construction methods include sheet pile cofferdams and temporary retaining walls. The proposed design offers a more stable and efficient alternative solution.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Braced Sheet Pile, Cofferdam, Kolam Tampungan, Water Intake
Subjects:	Q Science Q Science > QA Mathematics > QA911 Fluid dynamics. Hydrodynamics T Technology > TA Engineering (General). Civil engineering (General) > TA444 Reinforced concrete T Technology > TA Engineering (General). Civil engineering (General) > TA760+ Retaining walls 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:	Em Syahdu Aflahis Salam El Wanda
Date Deposited:	29 Jul 2025 02:28
Last Modified:	29 Jul 2025 02:28
URI:	http://repository.its.ac.id/id/eprint/122315

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