Perencanaan Perbaikan Tanah Metode Preloading Sistim Surcharge Dan Pondasi Gendalo-Gehem Onshore Receiving Facility Di Tanjung Santan, Kalimantan Timur

Rahman, Alfin Kafia (2015) Perencanaan Perbaikan Tanah Metode Preloading Sistim Surcharge Dan Pondasi Gendalo-Gehem Onshore Receiving Facility Di Tanjung Santan, Kalimantan Timur. Undergraduate thesis, Institut Technology Sepuluh Nopember.

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Abstract

Proyek pembangunan Gendalo-Gehem Onshore Receiving Facility (ORF) dilaksanakan untuk mengolah gas dan minyak dari floating production unit (FPU) laut dalam baru, yakni lapangan Gendalo dan lapangan Gehem di Blok Muara Bakau. Gendalo-Gehem ORF akan dibangun di Tanjung Santan dengan luas 31000 m2 yang meliputi: Area 1 dan Area 2. Pada Area 1 akan dibangun peralatan Knock Out Drum, Closed Drain Drum, Flare dan Metering Gas. Pada Area 2 akan dibangun peralatan Pig Launcher. Proyek tersebut akan dibangun diatas timbunan setinggi 3,5 – 6,5 m untuk mendapatkan elevasi yang direncanakan yakni pada elevasi +13,5m. Mengingat tanah dasar dimana proyek tersebut akan dibangun merupakan tanah lempung yang memiliki daya dukung yang kecil, pemampatan yang besar dan waktu konsolidasi yang lama, maka perlu dilakukan perbaikan tanah untuk meningkatkan daya dukungnya dan menghilangkan pemampatannya sebelum ORF dibangun. Peningkatan daya dukung dilakukan dengan memasang geotekstil pada timbunan, sedang pemampatan vi dihilangkan dengan memberikan preloading dan PVD untuk mempercepat waktu pemampatannya. Penimbunan dilakukan secara bertahap dengan kecepatan 60 cm/minggu. Untuk perkuatan tanah timbunan digunakan geotekstile sebanyak 27 lapis pada area 1 dan 9 lapis pada area 2. PVD dipasang sedalam 9,5 m dengan pola pemasangan segitiga dan jarak antar PVD 1,5 m pada area 1 dan 1,1 m pada area 2. Untuk mencapai derajat konsolidasi (U) 90% dibutuhkan waktu 20 minggu untuk area 1 dan 13 minggu pada area 2. Jenis pondasi untuk peralatan Knock Out Drum, Closed Drain Drum dan Flare di Area 1 adalah pondasi rakit dengan ukuran 15,5 x 28 x 0,7; Untuk peralatan Metering Gas di area 1 adalah pondasi telapak 1,5 x 1,5 x 0,3 m. Sedangkan jenis pondasi untuk peralatan Pig Launcher di area 2 adalah pondasi telapak dengan ukuran 1 x 1 x 0,3 m. =================================================================================================== Gendalo-Gehem Onshore Receiving Facility (ORF) construction is aimed to cultivate both gas and oil which come from floating production unit (FPU) deep sea, i.e. Gendolo and Gehem field in Blok Muara Bakau. Gendolo-Gehem ORF are going to be built in Tanjung Santan with 31000 m2 area of field which is including area 1 and area 2. Some equipments such as such as Knock Out Drum, Closed Drain Drum, Flare and Metering Gas are going to be built in area 1, and Pig Launcher in area 2. Gendalo-Gehem ORF project are going to be built on 3,5 – 6,5 m height embankment in order to obtain the expected elevation (+ 13,5 m). According to geotechnical survey results, it was obtained that the area of subgrade is classified as soft clay soil which has low bearing capacity, large number of compression, and wide range of consolidation time. Hence, soil reparation is considered both to increase the bearing capacity and to remove the compression before ORF is built. Geotextile is used as the viii enhancement of the bearing capacity whereas PVD and preloading for removing the compression in order to accelerate the compression time. Landfill operation need to be done gradually for 60cm/week. The soil reinforcement is using 27 and 14 layers of geotextile respectively in area 1 and area 2. The PVD installed in 9,5 m depth with triangle mounting pattern, while 1,5 m spacing for the area 1 and 1,2 m for the area 2. In order to achieve 90% of degree of consoidation, area 1 needs 20 weeks and area 2 meanwhile needs 13 weeks. Type of foundation for Knock Out Drum, Closed Drain Drum and Flare in area 1 is mat foundation with 15,5 x 28 x 0,7 m in dimension; and for Metering Gas equipment in area 1 is spread footing foundation with 1,5 x 1,5 x 0,3 m in dimension. Besides, Pig Launcher equipment in area 2 uses spread footing foundation with 1 x 1 x 0,3 m in dimension.

Item Type: Thesis (Undergraduate)
Additional Information: RSS 624.151 363 Rah p
Uncontrolled Keywords: Gendalo-Gehem, Onshore Receiving Facility, Surcharge, Prefabricated Vertical Drain, Geotekstil, Pondasi Rakit, Pondasi Telapak
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization
Divisions: Faculty of Civil Engineering and Planning > Civil Engineering > 22201-(S1) Undergraduate Thesis
Depositing User: Mr. Tondo Indra Nyata
Date Deposited: 24 Apr 2019 04:33
Last Modified: 24 Apr 2019 04:33
URI: https://repository.its.ac.id/id/eprint/62836

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