Yogyanta, Dwiaji Ari (2017) Prediksi Pemampatan Dan Perbaikan Tanah Metode Preloading Kombinasi Prefabricated Vertical Drain (Pvd) Berdasarkan Data Sondir Dan Data Laboratorium Pada Penambahan Ruas Jalan Akses Pelabuhan Trisakti-Liang Anggang. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Proyek penambahan ruas jalan akses pelabuhan Trisakti-Liang Anggang dibangun di atas lapisan tanah dasar yang dominan tanah lempung lunak. Metode perbaikan tanah yang digunakan adalah metode preloading dengan Prefabricated Vertical Drain (PVD) yang ditujukan untuk mempercepat pemampatan. Umumnya, prediksi pemampatan dihitung berdasarkan parameter konsolidasi yang didapat dari data laboratorium. Padahal prediksi pemampatan juga dapat dihitung berdasarkan korelasi nilai tahanan konus (qc) dari data Sondir. Untuk itu dalam Tugas Akhir ini dilakukan perbandingan prediksi pemampatan dan perencanaan perbaikan tanah berdasarkan dua data tersebut. Pada saat prediksi pemampatan dan perencanaan perbaikan tanah, harga koefisen konsolidasi arah horizontal (Ch) dan koefisien constrained modulus (αm) yang digunakan sesuai di lapangan. Harga Ch dan αm di lapangan didapat berdasarkan data pemampatan hasil trial embankment yang diperoleh dari bacaan Settlement Plate di lapangan.
Harga Ch di lapangan didapat dengan mencoba berbagai harga Ch kemudian diplotkan (fitting curve) besar pemampatan hasil trial embankment di lapangan pada grafik pentahapan timbunan hingga menunjukkan kondisi yang sama dan stabil. Harga Ch lapangan yang didapat berdasarkan hasil trial embankment sebesar 5x Cv. Sedangkan harga αm yang sesuai di lapangan sebesar 2,77 yang diperoleh dengan back calculation dari besar pemampatan hasil trial embankment di lapangan.
Perencanaan perbaikan tanah berdasarkan data Sondir dibagi menjadi 5 zona pemasangan PVD. Prediksi pemampatan dari 5 zona tersebut berkisar 0,388-1,029 m dengan Hinisial setinggi 2,039-2,591 m untuk Hfinal rencana 1,5 m. Sedangkan perencanaan perbaikan tanah berdasarkan data laboratorium dibagi menjadi 3 zona pemasangan PVD. Prediksi pemampatan dari ketiga zona tersebut berkisar 0,459-0,672 m dengan Hinisial setinggi 2,103-2,283 m untuk Hfinal rencana 1,5 m. Kedalaman optimum pemasangan PVD berdasarkan data Sondir berkisar 4-17 m, sedangkan berdasarkan data laboratorium berkisar 5-14 m. Pola pemasangan PVD yang dipakai dari perncanaan berdasarkan data Sondir dan data laboratorium sama, yaitu segitiga jarak 120 cm dengan waktu konsolidasi 4,25 bulan. Berdasarkan analisa stabilitas lereng timbunan baik pada
perencanaan berdasakan data Sondir maupun data laboratorium tidak dibutuhkan perkuatan lereng.
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Additional access road of Trisakti Port-Liang Anggang’s
project has built on the ground which dominant of soft clay soil. The selected ground improvement method is preloading with Prefabricated Vertical Drain (PVD) which’s intended for accelerate settlement. Generally, the prediction of settlement is calculated based on consolidation parameters from laboratory data. The prediction of settlement also can be calculated based on the correlation of resistant qonus value (qc) from Sondir data. Therefore, in this final project, the prediction of settlement is calculated based on 2 data. When the prediction of settlement and design of soil improvements are calculated, the value of coefficient of consolidation due to horizontal flow (Ch) and coefficient of constrained modulus (αm) which’s used are suitable with the value in the field. The value of Ch and αm in the field are determined based on settlement data from the results of trial embankment which’s gotten from Settlement Plate.
The value of Ch in the field is determined by trying various values of Ch then plot the settlement in the field to a graph of the stage of embankment until it has the same condition and stable. This way is called curve fitting. The value of Ch in the field which’s determined based on the results of the trial embankment is 5 x Cv while the value of αm in the field is 2.77 which’s determined by back calculation form the results of trial embankment in the field.
Design of soil improvement based on Sondir data are divided into 5 zones of PVD’s installation. The prediction of settlement for 5 zones are about 0,388-1,029 m with Hinitial’s ranges equal to 2,039-2,591 m for Hfinal equal to 1,5 m. While design of soil improvement based on laboratory data are divided into 3 zones of PVD’s installation. The prediction settlement for 3 zones are about 0,459- 0,672 m with Hinitial’s ranges equal to 2,103-2,283 m for Hfinal equal to 1,5 m. Optimum depth of PVD based on Sondir data are about 4-17 m, while based on laboratory data are about 5-14 m. Pattern of PVD which’s used for design based on Sondir data and laboratory data are same, which’s triangle pattern with distance of 120 cm and need for 4,25 months to finish consolidation. Based on the analysis of stability of the slope either design based on Sondir data or laboratory data isn’t needed of reinforcement.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Preloading, PVD, Pemampatan berdasarkan data Sondir, Pemampatan berdasarkan data laboratorium |
| 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: | - DWIAJI ARI YOGYANTA |
| Date Deposited: | 27 Mar 2017 04:10 |
| Last Modified: | 05 Mar 2019 02:02 |
| URI: | http://repository.its.ac.id/id/eprint/2298 |
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