Pricilia, Aurel (2021) Analisis Kekuatan Daya Dukung Pondasi Dalam Akibat Pengaruh Likuifaksi dan Metode Perbaikannya Studi Kasus: Tangki Terminal Bahan Bakar Minyak di Ampenan, Lombok. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Indonesia merupakan daerah yang rawan terhadap gempa bumi karena berada di titik pertemuan tiga lempeng bumi, yaitu Lempeng Pasifik, Lempeng Eurasia, dan Lempeng Indo-Australia. Daerah yang rawan gempa di Indonesia, antara lain adalah wilayah Nusa Tenggara. Daerah dengan potensi gempa yang tinggi dapat menjadi sangat berbahaya untuk daerah yang memiliki tanah dengan jenis pasir karena dapat menimbulkan potensi likuifaksi. Likuifaksi adalah kejadian dimana tanah dengan konsistensi very loose – medium dense yang jenuh kehilangan kekuatannya akibat adanya getaran yang kuat seperti gempa bumi. Oleh sebab itu, untuk merencanakan bangunan pada daerah rawan gempa dengan kondisi tanah pasir, harus dilakukan analisa zona likuifaksi.
Saat ini, terdapat Terminal Bahan Bakar Minyak di kota Ampenan, Lombok yang kondisi tanahnya pasir dengan konsistensi loose hingga medium dense dan daerah tersebut merupakan daerah yang rawan terhadap gempa. Terminal Bahan Bakar Minyak tersebut menggunakan pondasi tiang pancang sebagai bangunan struktur bawah, namun pondasi tiang pancang eksisting yang sudah digunakan belum memperhitungkan potensi likuifaksi.
Pada tugas akhir ini, pondasi tiang pancang yang ada di Terminal Bahan Bakar Minyak akan dianalisis dengan memperhatikan adanya pengaruh likuifaksi. Apabila pondasi tiang pancang yang sudah ada tidak kuat terhadap pengaruh likuifaksi, maka akan direncanakan metode perbaikan lapisan tanah guna memperkuat pondasi yang sudah ada dengan beberapa metode; antara lain metode penambahan tiang bor, metode cement grouting, dan metode ground flex mole. Perhitungan beban akibat struktur di atasnya akan dilakukan menggunakan software SAP2000 untuk mengetauhi reaksi perletakan pada pondasi yang sudah ada. Dengan adanya analisis dan metode perbaikan yang dilakukan dalam penulisan Tugas Akhir ini, akan dapat diperoleh metode alternatif perbaikan tanah disekitar Tangki Terminal Bahan Bakar Minyak.
Dari hasil analisis yang telah dilakukan, didapatkan kesimpulan dapat digunakan penambahan tiang bor diameter 60 cm sebanyak 36 tiang sedalam 30 meter didapatkan Qallow sebesar 69.76 ton, penyuntikkan cement grouting tipe 1 sedalam 20 meter dengan diameter 0.56 meter dan jarak 1.7 meter di sekeliling tangki didapatkan Qallow sebesar 133.86 ton, penyuntikkan cement grouting tipe 2 sedalam 20 meter dengan diameter 0.7 meter dan jarak 1.5 meter di sekeliling tangki didapatkan Qallow sebesar 194.95 ton, dan metode ground flex mole diameter 0.7 meter dan jarak 1.5 meter di bawah tangki dengan Qallow sebesar 108.63 ton. Perbaikan yang disarankan untuk dilakukan adalah metode ground flex mole dengan pertimbangan biaya kebutuhan bahan yang lebih murah, yaitu Rp 925,226,301.21.
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Indonesia is a country that is prone to earthquake because it is located on the intersection of three earth plate, Pacific Plate, Eurasia Plate, and Indo-Australian Plate. Regions in Indonesia that is very prone to earthquake is Nusa Tenggara. Regions with high potential of earthquake can be very dangerous for the area that has sandy soil because it can cause the potential of liquefaction. Liquefaction is a phenomena where saturated sandy soil with very loose to medium dense consistency lose its bearing capacity because of a very strong vibration like earthquake. Nevertheless, building needs to be planned as an earthquake resistance building with consideration of the potential of liquefaction.
Now, there is an oil fuel terminal in Ampenan, Lombok where it’s built on sandy soil with loose to medium dense consistency and the area of the terminal is very prone to earthquake. The oil fuel terminal is using spun pile as its foundation, but the pile is not calculated the potential of liquefaction which can happen anytime in that area.
In this final project, the existing piles beneath one of the oil fuel tank in the terminal will be analyzed with the potential of liquefaction in that area. If the existing piles are not resistance to the liquefaction, then there will be planned some methods to strengthen the existing pile beneath the oil fuel tank. The methods are adding bored piles around the existing structures, cement grouting method, and ground flex mole method. The calculation of loads caused by the super structures will be using SAP2000 software to get the joint reactions at the existing piles. With the analysis and calculation of the alternative methods to strengthen the substructure of the existing piles in this final project, a method that is reasonable to be implemented will be the output of this final project.
From the analysis and the calculation results, it is known that the improvement methods that can be implemented are adding bored piles around the existing structures that needs 36 additional 0.6 meters diameter bored piles planted through 30 meters layer of soils with Qallow in the amount of 69.79 ton, cement grouting type 1 with 0.56 meters diameter and 1.7 meters distance around the existing structures with Qallow in the amount of 133.86 ton, cement grouting type 2 with 0.7 meters diameter and 1.5 meters distance around the existing structures with Qallow in the amount of 194.95 ton, and ground flex mole method with 0.7 meters diameter and 1.5 meters distance under the existing structures with Qallow in the amount of 108.63 ton. The recommended improvement method is ground flex mole method considering the cheaper cost of Rp 925,226,301.21.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | cement grouting, gempa, ground flex mole, likuifaksi, pondasi dalam, cement grouting, earthquake, ground flex mole, liquefaction, deep foundation |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction) |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22201-(S1) Undergraduate Thesis |
| Depositing User: | Aurel Pricilia |
| Date Deposited: | 18 Aug 2021 04:52 |
| Last Modified: | 18 Aug 2021 04:52 |
| URI: | http://repository.its.ac.id/id/eprint/87427 |
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