Situngkir, Edwin Mehator (2023) Evaluasi Daya Dukung Tanah (CBR) Dan Lapisan Bawah Permukaan Pada Subgrade Yang Diperbaiki Dengan Metode Grouting Water Cement Di Ruas Jalan Nasional Tuban-Babat-Lamongan-Gresik. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Salah satu penyebab kerusakan yang terjadi pada ruas jalan nasional Tuban–Babat–Lamongan–Gresik adalah kondisi subgrade yang memiliki nilai CBR rendah. Dari hasil penyelidikan tanah diperoleh nilai CBR kurang dari 3,0%. Perbaikan subgrade dilakukan dengan metode grouting water cement bertujuan untuk meningkatkan nilai CBR. Untuk mengevaluasi daya dukung tanah (CBR) dan kondisi lapisan bawah permukaan setelah dilakukan grouting water cement dibuat pengujian skala laboratorium dan lapangan. Pengujian laboratorium dengan membuat pemodelan benda uji CBR sesuai kepadatan lapangan dengan variasi injeksi kuantitas material grouting dan rasio air semen (w/c). Variasi kuantitas material grouting yang diinjeksi 3%, 5% dan 7% dari berat isi kering sampel tanah benda uji dengan variasi rasio air semen w/c=1, w/c=1,5 dan w/c=2. Sedangkan pengujian lapangan dilakukan dengan cara akuisisi data Ground Penetrating Radar (GPR). Grouting water cement dapat meningkatkan daya dukung tanah (CBR). Peningkatan nilai CBR terbesar terjadi pada variasi injeksi kuantitas material grouting 7% dan w/c=1. Pada sampel 1 Sta 35+000 nilai CBR inisial 0,14% meningkat menjadi 1,96% dan pada sampel 2 Sta 37+850 nilai CBR inisial 1,41% meningkat menjadi 2,47%, namun daya dukung subgrade yang dihasilkan masih lemah karena nilai CBR kurang dari 6%. Dari analisis data GPR pada Sta 34+700 dan Sta 37+850 terlihat pada radargram material grouting naik akibat tekanan balik karena tidak dapat menembus lapisan subgrade sehingga material grouting menyebar pada lapisan aggregat dan keluar melalui lubang grouting titik lain di permukaan aspal. Pada radargram terlihat reflector berupa horizon kecil tajam dan seragam sepanjang trace sampai kedalam lapisan paling bawah sehingga tidak ada perubahan kondisi lapisan subgrade setelah dilakukan grouting water cement
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One of the causes of the damage that occurred on the Tuban–Babat–Lamongan–Gresik national road is the subgrade condition which has a low CBR value. From the results of soil investigation, the CBR value is less than 3.0%. Subgrade improvement is carried out using the grouting water cement method to increase the CBR value. To evaluate soil bearing capacity (CBR) and the condition of the subsurface layer after grouting water cement, laboratory and field scale tests were carried out. Laboratory testing by modeling CBR test objects according to field density with injection variations in the quantity of grouting material and water-to-cement ratio (w/c). Variations in the quantity of grouting material injected were 3%, 5% and 7% of the dry unit weight of the soil samples tested with variations in the ratio of water to cement w/c=1, w/c=1.5 and w/c=2. While field testing is carried out by acquiring Ground Penetrating Radar (GPR) data. Grouting water cement can increase soil bearing capacity (CBR). The greatest increase in the CBR value occurred in variations in the injection quantity of grouting material 7% and w/c=1. In sample 1 Sta 35+000 the initial CBR value of 0.14% increased to 1.96% and in sample 2 Sta 37+850 the initial CBR value of 1.41% increased to 2.47%, but the soil bearing capacity of the resulting subgrade was still weak because the CBR value is less than 6%. From the analysis of the GPR data at Sta 34+700 and Sta 37+850 it can be seen on the radargram that the grouting material has increased due to back pressure because it cannot penetrate the subgrade layer so that the grouting material spreads on the aggregate layer and exits through the grouting holes at other points on the asphalt surface. On the radargram, it can be seen that the reflector is in the form of a small, sharp and uniform horizon along the trace down to the lowest layer so that there is no change in the condition of the subgrade layer after grouting water cement
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Grouting Water Cement, Subgrade, CBR, Ground Penetrating Radar (GPR). |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction) |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis |
| Depositing User: | Edwin Mehator Situngkir |
| Date Deposited: | 01 Feb 2023 01:09 |
| Last Modified: | 01 Feb 2023 01:09 |
| URI: | http://repository.its.ac.id/id/eprint/95918 |
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