Aprilia, Ananda Fitri (2024) Analisis Penyebab Kelongsoran Lereng Tower SUTT dengan Pendekatan Cracked Soil dan Rencana Perbaikannya menggunakan Dinding Penahan Tanah, Turap, dan Gabion Wall (Studi Kasus: Tower SUTT T-03, Segoromadu, Kebomas, Gresik). Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Perusahaan Listrik Negara (PLN) merupakan badan usaha milik negara yang bergerak di bidang pengelolaan tenaga listrik, salah satunya adalah pendistribusian tenaga listrik. Proses pendistribusian tenaga listrik dilakukan melalui media transmisi tower SUTT. Untuk menjaga keberlangsungan proses distribusi listrik, lokasi tower SUTT sebaiknya berada di permukaan tanah yang datar. Akan tetapi, terdapat tower SUTT yang terletak di tepi lereng, yaitu tower SUTT T-03 yang merupakan bagian dari jaringan transmisi nasional wilayah Jawa Timur dan Bali di Desa Segoro Madu, Kecamatan Kebomas, Kabupaten Gresik. Tower T-03 terletak di elevasi +20,431 m dimana pada sisi Timur tower T-03 yang berjarak kurang lebih 100 meter terdapat kawasan industri dan pabrik pada elevasi +11,873 m yang sedang melaksanakan pembangunan. Setelah dilakukan kegiatan pemancangan pada bangunan pabrik pada saat curah hujan tinggi, terjadi kelongsoran pada lereng di samping tower T-03.
Tanah dasar di bawah tower T-03 merupakan tanah lempung berlanau hingga kedalaman 6 meter dengan konsistensi medium hingga medium to stiff. Tanah lempung berlanau juga ditemukan di bagian tengah lereng hingga kedalaman 4 meter dengan konsistensi soft hingga medium. Tower T-03 dibangun di atas pondasi tiang pancang berdiameter 30 cm dengan kedalaman 150 cm yang memikul beban aksial dari tower sebesar 539,46 KN, transversal shear sebesar 79,53 KN, dan longitudinal shear sebesar 79,93 KN. Saat ini telah direncanakan perkuatan lereng menggunakan dinding penahan tanah yang dikombinasikan dengan micropile sebanyak lima buah per meter untuk mencegah terjadinya kelongsoran lanjutan pada saat proses konstruksi dinding penahan tanah berlangsung. Untuk itu, perlu dilakukan analisis untuk mengetahui penyebab kelongsoran serta perencanaan perkuatan yang efektif dan efisien sebagai solusi perbaikan lereng.
Berdasarkan hasil analisis, diperoleh kesimpulan bahwa dampak getaran akibat pemancangan terhadap tanah dasar adalah ”minor fault” sehingga aktivitas tersebut tidak memengaruhi terjadinya longsor pada lereng tower SUTT T-03. Penyebab kelongsoran lereng tower SUTT T-03 adalah adanya crack pada bagian depan lereng dan hujan deras dengan intensitas 186 mm. Hasil analisis pondasi tower eksisting menunjukkan nilai safety factor daya dukung pondasi adalah 2,74 dan penurunan pondasi adalah 0,2203 inci sehingga dapat disimpulkan pondasi tower eksisting tidak memerlukan tambahan pondasi. Hasil analisis terhadap overall stability rencana perkuatan eksisting menujukkan nilai safety factor sebesar 1,524 sehingga tidak memerlukan tambahan perkuatan berupa cerucuk. Untuk memperbaiki lereng tower SUTT T-03, dipilih alternatif perkuatan yang memiliki total harga material paling ekonomis yaitu gabion wall berekor dengan harga material Rp4.831.397.
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The Indonesian State Electricity Company (PLN) is a state-owned enterprise engaged in electricity management, including electricity distribution. The distribution process is carried out through SUTT transmission towers. To ensure the continuity of the electricity distribution process, the SUTT tower locations should ideally be on flat ground surface. However, there is a SUTT tower located on the edge of a slope, specifically the SUTT T-03 tower, which is part of the national transmission network in East Java and Bali, located in Segoro Madu Village, Kebomas Subdistrict, Gresik Regency. Tower T-03 is located at an elevation of +20,431 meters, where approximately 100 meters east of the tower is an industrial and factory area at elevation of +11,873 meters that is currently under construction. After pile driving activities at the factory during high rainfall, a landslide occurred on the slope next to T-03 tower.
The subgrade under tower T-03 is clayey silt up to a depth of 6 meters with medium to medium-to-stiff consistency. Clayey silt is also found in the middle part of the slope up to a depth of 4 meters with soft to medium consistency. Tower T-03 is built on pile foundations with a diameter of 30 cm and a depth of 150 cm, supporting an axial load of 539,46 KN, transversal shear of 79,53 KN, and longitudinal shear of 79,93 KN. Currently, a slope reinforcement plan is in place using retaining walls combined with five micropiles per meter to prevent further landslides during the construction of the retaining wall. Therefore, an analysis is needed to determine the cause of the landslide and plan effective and efficient reinforcement as a solution for slope stabilization.
Based on the analysis results, it was concluded that the impact of vibrations due to piling on the subsoil is classified as a "minor fault", thus this activity does not affect the occurrence of failures on the slope of tower SUTT T-03. The cause of the landslide on the slope of tower SUTT T-03 is the presence of a crack at the front part of the slope and heavy rain with an intensity of 186 mm. The analysis of the existing tower foundation shows that the safety factor of the foundation's bearing capacity is 2.74 and the foundation settlement is 0,2203 inches, indicating that the existing tower foundation does not require additional foundation. The analysis of the overall stability of the planned reinforcement shows a safety factor value of 1.524, hence no additional reinforcement in the form of piles is needed. To repair the slope of tower SUTT T-03, the most economical material alternative for reinforcement was selected, which is a reinforced-gabion wall with a material cost of Rp4.831.397.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Cracked soils, gabion walls, sheet piles, slope stabilization, SUTT tower, cracked soils, gabion walls, turap, stabilitas lereng, tower SUTT |
| Subjects: | 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: | Ananda Fitri Aprilia |
| Date Deposited: | 05 Aug 2024 07:23 |
| Last Modified: | 05 Aug 2024 07:23 |
| URI: | http://repository.its.ac.id/id/eprint/111672 |
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