Perencanaan Shore Protection dan Tipikal Pondasi Pada Area Perluasan Di Proyek Pembangunan PLTMG 50 MW PT. Perusahaan Listrik Negara, Sorong

Putra, Candra Okto Rian Dwi (2020) Perencanaan Shore Protection dan Tipikal Pondasi Pada Area Perluasan Di Proyek Pembangunan PLTMG 50 MW PT. Perusahaan Listrik Negara, Sorong. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Salah satu pengembangan yang dilakukan oleh PT. Perusahaan Listrik Negara (PLN) di Sorong adalah perluasan lahan PLTMG (Pembangkit Listrik Tenaga Mesin Gas) sebagai usaha peningkatan kapasitas listrik menjadi 50 MW. Perluasan lahan ini direncanakan seluas 4,6945 hm2 dan direncanakan untuk pembangunan sebuah tangki tegak berisi light fuel oil (LFO) sebagai Sumber energi pembangkit listrik. Disamping itu, terdapat beberapa kondisi yang dapat menghambat perencanaan perluasan lahan seperti lapisan tanah eksisting didominasi oleh lanau kelempungan, daya dukung tanah di area perluasan cenderung rendah hingga kedalaman kritis 16 meter (NSPT < 15), dan lokasi area pematangan lahan berada di pesisir pantai. Dengan adanya kondisi- kondisi tersebut maka pada tugas akhir ini dilakukan perencanaan shore protection dengan perbaikan tanah dan pondasi tipikal yang sesuai dengan beban tangki timbun. Dari hasil analisa gelombang air laut dan data tanah didapatkan tinggi puncak shore protection dengan struktur rubble mound setinggi 4,78 m dan diputuskan pembagian area perluasan sebanyak 3 zona untuk perencanaan. Metode perbaikan tanah yang direncanakan adalah metode preloading kombinasi PVD dengan pola segitiga dan segiempat; jarak antar PVD 0,8 m; dan panjang PVD hingga kedalaman lapisan comppressible. Berdasarkan hasil perhitungan peningkatan daya dukung tanah dan analisa stabilitas lereng shore protection dengan program bantu didapatkan SF > 1,5 sehingga aman terhadap gelincir atau longsor. Dilain hal, dari hasil perhitungan penurunan pondasi dangkal tangki timbun tidak direkomendasikan karena penurunan tangki sebesar 1,212 m melebihi batas izin maksimum tangki timbun oil and gas oleh API 653 yakni sebesar 2 inchi atau 50,8 mm. Oleh sebab itu maka diputuskan perencanaan pondasi dalam spunpile produk WIKA dengan kedalaman hingga 24 m tanpa perbaikan tanah di area pembangunan tangki timbun ================================================================================================== One of the developments that PT. Perusahaan Listrik Negara ( PLN ) in sorong working on is expanding area of PLTMG ( Pembangkit Listrik Tenaga Mesin Gas ) as an effort to increasing the electricity capacity to 50 MW. This area expansion are planned to be 4,6945 hm2 and planned to build upright tank contain light fuel oil ( LFO ) as an energy source of power plants. Beside that, there are several conditions that can hampering the land expansion planning such as existing soil that dominated by silty clay, soil bearing capacity in the expansion area tends to be low until a depth of 16 meters (NSPT < 15), and the location of the land expansion area is on the coast. Given these conditions, in this final project there will be planning of a shore protection with improving the soil and the typical foundation of storage tank. Based on the results of the sea water waves forcasting the data of soil that obtained the height of the planned peak shore protection with a rubble mound structure as high as 4,78 m and decided that area will be devided to 3 area expansion for the planning, the planned soil improvement method is a preloading method of PVD combination with a triangle and quadrilateral pattern; distance between PVD 0,8 m; and the length of the PVD to the depth of the comppressible layer. Based on the calculation of the increase in the carrying capacity of the soil and stability analysis of the shore protection slope with an assist program obtained SF > 1.5 making it safe against slipping or landslides. On the other hand, from the calculation of the decrease in the shallow foundation of the storage tank is not recommended because the reduction in the tank by 1,212 m exceeds the maximum permit limit of the oil and gas storage tank by API 653 which is equal to 2 inches or 50.8 mm. Therefore, it was decided to plan the foundation in the spunpile WIKA product with a depth of up to 24 m without soil improvement in the construction area of the storage tank.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: PLTMG 50 MW, Preloading, Prefabricated Vertical Drain, Sea Wave Analysis, Shore Protection, Shallow Foundation, Deep Foundation, PLTMG 50 MW, Preloading, Prefabricated Vertical Drain, Analisa Gelombang Air Laut, Shore Protection, Pondasi Dangkal, Pondasi Dalam.
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction)
T Technology > TC Hydraulic engineering. Ocean engineering > TC203.5 Coastal engineering
Divisions: Faculty of Civil Engineering and Planning > Civil Engineering > 22201-(S1) Undergraduate Thesis
Depositing User: Candra Okto Rian Dwi Putra
Date Deposited: 05 Aug 2020 04:18
Last Modified: 05 Aug 2020 04:18
URI: https://repository.its.ac.id/id/eprint/76965

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