Triarso, Arik (2016) Studi Pengaruh Pemancangan Dengan Metode Injeksi Terhadap Ekses Tekanan Air Pori Dan Pergerakan Tanah Dengan Pemodelan Menggunakan Program Plaxis 2D dan 3D. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pemancangan tiang sistem injeksi pada tanah lunak (lempung) dapat mengakibatkan pergerakan tanah dan ekses tekanan air pori di sekitar tiang, serta dapat menyebabkan potensi kerusakan struktur di sekitarnya, contohnya pergerakan tanah yang terjadi pada proyek SL dan proyek yang dibangun di suatu lahan bekas pertokoan di Surabaya. Hingga saat ini prediksi pergerakan tanah dan ekses tekanan air pori akibat pemancangan masih terus dilakukan untuk pengkajian, pengembangan, dan penelitian lebih lanjut, terutama untuk pemancangan kelompok tiang ( > 1 Tiang ) .
Penelitian ini bertujuan untuk memodelkan pemancangan tiang tunggal dan kelompok tiang ( > 1 tiang ) untuk mendapatkan tren perpindahan lateral tanah dan ekses tekanan air pori, serta untuk mengetahui pengaruh diameter tiang, jumlah tiang, dan alur pemancangan tiang terhadap perpindahan lateral tanah dan ekses tekanan air pori tersebut. Pemodelan dilakukan dengan metode Displacement - Controlled Cavity Expansion (DCCE) menggunakan program Plaxis 2D dan 3D. Verifikasi model dilakukan dengan cara membandingkan hasil pemodelan tiang tunggal dengan teori Cylindrical Cavity Expansion (CCE).
Dari hasil pemodelan diketahui bahwa pemodelan numerik pemancangan sistem injeksi pada tanah lempung (kondisi Undrained) dapat dilakukan menggunakan metode DCCE dengan prescribed displacement 0,21d - 0,25d dan model tanah Mohr-Coulomb, pemodelan kelompok tiang ( > 1 tiang ) dapat dimodelkan menggunakan PLAXIS 3D. Selisih perbedaan perpindahan lateral tanah antara teori CCE dan hasil PLAXIS dengan jaring elemen yang halus adalah < 10%, selisih perbedaan ekses tekanan air pori antara hasil PLAXIS dan teori CCE adalah < 20%, selisih perbedaan tersebut tergantung dari tingkat kehalusan jaring elemen. Tren perpindahan lateral tanah di zona plastis pada setiap kedalaman relatif seragam, sedangkan tren ekses tekanan air pori tergantung dari parameter tanah disetiap kedalaman. Saat diameter semakin besar maka perpindahan lateral dan ekses tekanan air pori semakin besar. Saat jumlah tiang semakin bertambah maka perpindahan lateral () dan ekses tekanan air pori juga semakin bertambah. Peningkatan perpindahan lateral antar fase penambahan tiang (Δ) di titik yang didekati semakin bertambah, sedangkan Δ di titik yang ditinggalkan semakin berkurang. Hasil simulasi tiang berdasarkan data proyek SL untuk simulasi 9 tiang memberikan perpindahan lateral tanah di titik IN-01 sebesar 22 mm dan ekses tekanan air pori di titik IN-01 pada kedalaman 3 m sebesar 6 kPa.
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Injection pile on soft soil (clay) can cause ground movement and excess pore water pressure around the pile, and can cause potential damage to the surrounding structures, such as ground movement that occurs in the project SL and project built in the area of former shopping complex in Surabaya. Until now, the prediction of ground movement and excess pore water pressure due to the installation of pile is still underway for the assessment, development, and further research, especially for installation of pile group ( > 1 pile ).
This study aims to model installations of single pile and pile groups ( > 1 pile ) to obtain trends lateral displacement of soil and excess pore water pressure, as well as to determine influence the pile diameter, number of pile and Pile installations direction against lateral displacement of soil and excess pore water pressure. Modeling in this study was conducted using Cavity Displacement-Controlled Expansion method (DCCE) with PLAXIS 2D and 3D program. Verification of the model is done by comparing the single pile model results and the cylindrical cavity expansion theory (CCE).
From the modeling results it is known that numerical modeling Injection Pile on clay (undrained conditions) can be performed using the DCCE method with prescribed displacement 0,21d - 0,25d and Mohr-Coulomb soil model, modeling of Pile group ( > 1 pile ) can be modeled using PLAXIS 3D. The diference of lateral displacement between theory CCE and output from PLAXIS with fine mesh is 10%, The diference of excess pore water pressure between output from PLAXIS and theory CCE is 20%, this deference depend genereted mehs . Trends lateral displacement of soil in plastic zone is relatively uniform at any depth, while the trend of excess pore water pressure depends on soil parameters at each depth. when the diameter increases, the lateral displacement and excess pore water pressure increases. When the number of pile increases, the lateral displacement () and the excess pore water pressure also increases, Increased lateral displacement between the phase of the addition of the pile (Δ) at the point of being approached increasing, while Δ at the point of diminishing abandoned. Pile installation simulation results based on data of project SL for the installation 9 pile, providing lateral displacement of the ground at the point of IN-01 by 22 mm and the excess pore water pressure at the point of IN-01 at depth of 3 m by 6 kPa.
| Item Type: | Thesis (Masters) |
|---|---|
| Additional Information: | RTS 624.151 36 Tri s |
| Uncontrolled Keywords: | pergerakan tanah; ekses tekanan air pori; PLAXIS 2D dan 3D; tanah lunak; pemancangan sistem injeksi; Cylindrical Cavity Expansion; Displacement-Controlled Cavity Expansion; soil movement; excess pore water pressure; soft soil; injection pile |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Faculty of Civil Engineering and Planning > Civil Engineering > 22101-(S2) Master Thesis |
| Depositing User: | Anis Wulandari |
| Date Deposited: | 05 Jul 2017 04:49 |
| Last Modified: | 27 Dec 2018 08:00 |
| URI: | http://repository.its.ac.id/id/eprint/41876 |
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