Marbun, Lindawati (2018) Perencanaan Perbaikan Tanah Area Reklamasi dengan Metode Preloading dengan Sistem Surcharge dengan PVD dan Watertank dengan PVD serta Perkuatan Dinding Polder di Tanjung Emas, Semarang. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pelabuhan Tanjung Emas mengembangkan zona khusus curah di sisi wilayah barat pelabuhan eksisting. Pembangunan zona tersebut akan disertai juga dengan pembangunan polder dan dermaga. Kondisi eksisting lokasi, saat ini berupa area perairan dengan elevasi permukaan tanah asli rata-rata -2.50 mLWS, sehingga akan dilakukan reklamasi. Adapun elevasi final setelah reklamasi direncanakan +1.5 mLWS. Mengingat kondisi tanah asli yang merupakan lempung lunak hingga kedalaman 27 m, timbunan yang tinggi serta beban operasional sebesar 4 t/m2 yang akan bekerja, maka permasalahan yang timbul adalah akan terjadi pemampatan serta resiko kelongsoran dari timbunan akibat pembangunan dermaga curah di salah satu sisi timbunan.
Selain permasalahan diatas, perlu juga direncanakan perkuatan area dinding polder serta perkuatan area reklamasi disisi dermaga. Elevasi dasar polder -3.00 mLWS dengan tinggi muka air pada polder adalah +0.6 mLWS, sedangkan sisi dermaga akan dikeruk -12 mLWS
Oleh sebab itu, dalam tugas ini akan direncanakan metode perbaikan tanah di area reklamasi. Metode perbaikan tanah akan direncanakan dengan 2 metode yaitu metode perbaikan tanah dengan beban surcharge preloading, dan metode perbaikan tanah dengan watertank preloading.
Metode perbaikan tanah dengan beban Surcharge Preloading diperoleh tinggi Hinisial sebesar 10.5 meter dengan besarnya penurunan yang terjadi sebesar 4.24 meter, Lama konsolidasi direncanakan 24 minggu dengan pemasangan PVD sedalam 27 m berpola segitiga jarak 1.3 m. Terdapat 3 alternatif perkuatan antara lain: perkuatan menggunakan geotextile sebanyak 32 lapis, perkuatan menggunakan micropiles D500 mm sedalam 20 m sebanyak 10 buah dan kombinasi geotextile sebanyak 16 lapis dengan micropile D300 mm sedalam 14 m sebanyak 8 buah
Metode perbaikan tanah dengan Watertank Preloading diperoleh Hinisial pengisian air sebesar 11.5 meter dengan besarnya penurunan yang terjadi sebesar 3.5 meter, Lama konsolidasi direncanakan 24 minggu dengan pemasangan PVD sedalam 27 m berpola segiempat jarak 1.5 m. Saat pelaksanaan perlu dilakukan perkuatan menggunakan micropile D350 mm sedalam 19 m sebanyak 9 buah. Setelah proses Watertank Preloading selesai, maka area yang telah perbaiki dapat ditimbun setinggi 7.5 m agar mencapai elevasi reklamasi final +1.50 mLWS dengan perkuatan menggunakan geotextile sebanyak 6 lapis.
Perkuatan Dinding Polder menggunakan Gabion dengan diperkuat dengan micropile 20x20., sedangkan sisi reklamasi yang akan dikeruk direncanakan menggunakan turap steel tube D1422 mm,dengan panjang 34 m menggunakan angkur steel tube D1422 mm miring.
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Tanjung Emas Port develops a special zone of bulk on the western side of the existing port. At the same time, the development is accompanied by the construction of polders. The existing condition of the location, which currently is in the form of waters, the original ground level elevation is about -2.50 mLWS, averagely, so it needs to be reclaimed. Based on the plan, it will be +1.5 mLWS after the reclamation. It should be noted that the original soil condition of the area of waters is in the form of soft clay to a depth of 27 m, and a heap as high as 4.0 meters and a large operational load to work. The problem that arises is the compression on the area and the risk of slumps caused by the construction of a bulk dock on one side of the heap.
In addition to the soil improvement planning at the reclamation area, reinforcement of polder walls and reinforcement the bulk dock sides are going to be planned. Reinforcement of polder walls with a basic elevation of -3.00 mLWS and a water level of +0.6 mLWS in ponds. The bulk dock sides is planned to be dredged till – 12 mLWS.
Therefore, in this task, methods of soil improvement at the reclamation area will be planned including the method of soil improvement with surcharge preloading and the method of soil improvement with watertank preloading.
The method of soil improvement with surcharge preloading will obtain a height of 10.5 meters of heap with a decrease of 4.24 meters, which requires the installation of rectangular-patterned PVD to a depth of 27 m with a distance of 1.3 m. The planned duration of consolidation is for 24 weeks. There are 3 reinforcement alternatives are, among others, reinforcement using 32 layers of geotextile, reinforcement using 10 pieces of micropiles D500 mm with 20 m deep, and reinforcement using 16 layers geotextile combined with 8 pieces micropiles D300 mm with 14 m deep.
The method of soil improvement with watertank preloading will obtain 11.5 meter-high water filling with a decrease of 3.5 meters, and requires the installation of PVD to a depth of 27 m in a rectangular pattern with a distance of 1.5 m, while the duration of consolidation is planned for 24 weeks. The implementation needs a reinforcement using 9 pieces of micropiles D350 mm as deep as 19 m. After the watertank preloading process is completed, the improved area can be heaped up as high as 7.5 m to reach the final reclamation elevation of +1.50 mLWS with reinforcement using 6 layers of geotextile.
Polder wall reinforcement will use Gabion reinforced by micropiles, while the reclaimed sides is planned to be dredged using with 34-meter-long steel tubes D1422 m, and D1422 m steel tube for anchor.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Reklamasi, Soft clay, Perbaikan tanah, Surcharge preloading, Watertank preloading, PVD, Dinding penahan tanah, Gabion, Turap, Reclamation, Soil improvement, Retaining wall, Steel tubes |
| 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: | Marbun Lindawati |
| Date Deposited: | 06 Feb 2018 07:57 |
| Last Modified: | 02 Apr 2024 08:30 |
| URI: | http://repository.its.ac.id/id/eprint/49985 |
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