Minata, Afria Nurizky (2017) Perubahan Daya Dukung Dan Pengembangan Tanah Ekspansif Akibat Stabilisasi Kapur Metode Deep Soil Mixing (DSM) Berpola Panels Dengan Variasi Jarak Dan Panjang Kolom (D = 4 cm). Sarjana thesis, Universitas Brawijaya.
Abstract
Tanah lempung ekspansif memiliki daya dukung yang rendah dan potensi kembang susut yang tinggi. Hal tersebut mengakibatkan struktur bangunan di atas tanah mengalami kerusakan seperti jalan bergelombang, plat lantai retak, penurunan pada pondasi. Sehingga perlu dilakukan stabilisasi untuk mengurangi pengembangan tanah. Stabilisasi tanah lempung ekspansif dapat dilakukan dengan metode Deep Soil Mixing (DSM) dengan ketebalan tanah yang akan diperbaiki lebih dari 1,5 m. Metode ini menggunakan variasi jarak dan kolom tertentu, serta berkonfigurasi panels dengan bahan aditif yaitu kapur kadar 8%. Terdapat dua macam pengujian, yaitu uji pengembangan dan uji pembebanan.Uji pengembangan bertujuan untuk mengetahui nilai pengembangan tanah. Sedangkan, uji pembebanan untuk mengetahui nilai daya dukung tanah. Benda uji tanpa stabilisasi setelah dicetak di dalam box ukuran 30x30x30 cm kemudian dilakukan uji beban. Sedangankan, untuk tanah stabilisasi yang telah di cetak di dalam box akan dibuat variasi jarak antar kolom (L) = 4, 5, 6 cm serta kedalaman kolom (Df) = 10, 15, 20 cm, kemudian dierami selama 3 hari dan dilakukan uji pembebanan. Stabilisasi kapur kadar 8% dengan kolom DSM dapat menurunkan nilai pengembangan dan meningkatkan nilai daya dukung tanah ekspansif. Hal tersebut dikarenakan kapur mengalami flokulasi sehingga menyebabkan butiran halus pada tanah lempung ekspansif mengeras dan lebih kuat. Variasi jarak dan kedalaman kolom berpengaruh pada peningkatan daya dukung tanah dan pengembangan tanah ekspansif. Semakin tinggi kedalaman kolom dan semakin kecil jarak kolom maka semakin besar nilai daya dukung tanah serta semakin kecil nilai pengembangannya. Jarak kolom (L) = 4 cm dengan kedalaman (Df) = 20 cm memiliki daya dukung terbesar yaitu 36,8 kg/cm2 dan persentase pengembangan terkecil yaitu 0,53%. Konfigurasi tersebut memenuhi kriteria untuk jalan raya dengan tebal perkerasan 25 cm dan tebal pondasi 35 cm, karena daya dukung tersebut mampu menahan beban per satuan luas sebesar 2,5215 kg/cm2. Selain itu, konfigurasi tersebut memenuhi persentase mengembang yang diizinkan yaitu 0,8% untuk flexible pavement dan 1,2% untuk rigid pavement.
English Abstract
Expansive clay soil have small value of bearing capacity in high water content and high swelling potential. It was damaged structure above the ground such as rutting, cracked floor of the building, and foundation settlement. Soil stabilization was needed to fix these problem so bearing capacity could be increased. One of expanive soil stabilization of is Deep Soil Mixing method (DSM) which can be used for more than 1,5 m active layer. This method use space variation and depth coloumn with 8% of lime. There are two kinds of test in this research, first was swelling test and second was loading test. Swelling test was held to investigated swell value of the clay. Meanwhile, loading test was held to investigated bearing capacity value on untrated sample and sample using lime stabilization that has been made on the box with dimension 30x30x30 cm. After untrated sample has been made in the box then loading test was performed. Meanwhile, sample using lime stabilization that has been made in the box, will be added with variation of column. The space of the columns (L) were 4, 5, 6 cm and the depth of the column (Df) were 10, 15, 20 cm. Lime stabilization levels at 8% with DSM method can reduce the swelling value and increase the bearing capacity value of expansive clay soil. It is becaused the lime suffer flocculation so that made soft soil granules of expansive clay more harder and stronger. Space variation and depth of column made bearing capacity increasing and reduce swelling value of expansive clay soil. The higher depth of the column and smaller space of column generate greater bearing capacity value and smaller swelling value. The space of column (L) = 4 cm and the depth (Df) = 20 cm have the largest bearing capacity value was 36,8 kg/cm2 and the smallest percentage of swelling was 0,53%. Based on the criteria for highways with thick of pavement was 25 cm and 35 cm thick of sub base, because the allowable bearing capacity to panels was 2,5215 kg/cm2. Beside that, the configuration meets the percentage allowed i.e 0,8% for flexible pavement and 1,2% for rigid pavement.
| Item Type: | Thesis (Sarjana) |
|---|---|
| Identification Number: | SKR/FT/2017/531/051706224 |
| Uncontrolled Keywords: | lempung ekspansif, deep soil mixing,kapur, stabilisasi tanah, swelling, daya dukung. |
| Subjects: | 600 Technology (Applied sciences) > 624 Civil engineering > 624.1 Structural engineering and underground construction > 624.15 Foundation engineering and engineering geology > 624.151 Engineering geology > 624.151 3 Rock and soil mechanics > 624.151 36 Soil mechanics > 624.151 363 Soil stabilization |
| Divisions: | Fakultas Teknik > Teknik Sipil |
| Depositing User: | Budi Wahyono Wahyono |
| Date Deposited: | 04 Sep 2017 03:31 |
| Last Modified: | 15 Nov 2024 07:48 |
| URI: | http://repository.ub.ac.id/id/eprint/2006 |
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