Nisa, Aria Khoirun (2019) Alternatif Perencanaan Tubuh Bendungan untuk Meminimalisir Laju Rembesan (seepage) pada Tubuh Bendungan Bendo, Kabupaten Ponorogo. Other thesis, Institut Tekniologi Sepuluh Nopember.
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Abstract
Tingginya kebutuhan air di wilayah Kabupaten Ponorogo, mendorong pemerintah untuk merencanakan bendungan guna menjaga ketersediaan air sepanjang tahun. Pentingnya keberadaan bendungan sehingga perlu dilakukan analisa lebih lanjut mengenai penyebab stabilitas tubuh bendungan. Salah satu penyebab kelongsoran pada tubuh bendungan adalah adanya aliran rembesan pada tubuh bendungan yang menyebabkan erosi pada tubuh bendungan. Analisa dilakukan dengan membandingkan dua tipe bendungan yaitu tipe urugan zonal dan tipe urugan membran melalui pendekatan analitik dengan Hukum Darcy serta melalui pendekatan numerik dengan Geo Studio SEEP/W. Kedua tipe tersebut akan diuji melalui variasi pemilihan material penyusun tubuh bendungan dan pengaruh tebal inti terhadap laju rembesan.Perhitungan secara numerik menggunakan Geo Studio SEEP/W ditinjau dari pengaruh susunan material terhadap laju rembesan dan variasi tebal inti kedap air. Material yang digunakan berdasarkan pada data saturated water characteristic curve (SWCC) dari penelitian yang dilakukan sebelumnya. Perhitungan secara numerik dilakukan pada bendungan tipe urugan zonal. Perhitungan juga dilakukan secara analitik dengan rumus Darcy sehingga diketahui perbedaan hasil laju rembesan pada kedua perhitung tersebut.
Hasil yang diperoleh dari analisa laju rembesan berdasarkan pendekatan secara numerik dan secara analitik menunjukkan bahwa pemilihan material dan desain inti kedap air mempengaruhi jumlah debit yang keluar akibat rembesan. Dari pendekatan yang sudah dilakukan didapatkan bahwa desain bendungan urugan zonal inti tegak, inti miring dan inti tirai yang dihitung dengan program bantu Geo Studio SEEP/W dengan bahan inti berupa lempung (clay) menghasilkan rembesan paling kecil. Hasil serupa juga didapatkan ketika ketiga variasi bendungan tipe urugan zonal dihitung dengan rumus Darcy. Sementara bendungan tipe urugan membran menunjukkan angka yang cukup besar dalam meluluskan rembesan, yaitu 1.77x10-3 m3/s pada bendungan membran beton aspal dan 3x10-3 m3/s pada bendungan membran beton. Untuk memaksimalkan desain dan fungsi tubuh bendungan, modifikasi lain terhadap tubuh bendungan bisa dilakukan untuk mendapatkan keuntungan secara desain maupun secara ekonomi.
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The highest water demand in Ponorogo, encourages the government to build dams to maintain water availability throughout the year. The existence of dams is very important, so it is necessary to further analysis causes that interfere with the stability of the dam body. One of the causes of landslide in the dam body is seepage flow that causes erosion of the dam body. The analysis is conducted by comparing the two types of dams, namely the zonal type and membrane type through an analytical approach with Darcy law and through a numerical approach with the Geo Studio SEEP/W. Both types will be tested through the variations Dam body materials and the core thickness effect of the seepage rate.
Numerical calculation using Geo Studio SEEP/W is reviewed from the material arrangement to the rate of seepage and the thickness variation of the waterproof core. The material used is based on the soil water characteristic curve (SWCC) data of the previous study. Numerical calculation are done on a zonal type dam. Calculation are also dane with Darcy law so that the results are known differences in the rate of the two calculations. The results from seepage rate analysis based on a numerical and analytical approach indicate that the choice of material and the core design affect the amount of discharge due to seepage. From the approach, it was found that the design of the upright zonal core dam, sloping core and curtain core was calculated by the Geo Studio SEEP/W with core material of clay to produce the smallest seepage. Similar results were obtained when the third variation of the zonal type dam is calculated by the Darcy law. While membrane-type dams show quite large numbers in passing seepage, namely 1.77x10-3 m3/s on asphalt concrete membrane dams and 3x10-3 m3/s on concrete membrane dams. To optimize the design and function of the body of the dam, other modifications to the dam body can do to gain an advantage in the design and economically.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Bendungan Bendo Tipe Urugan, Maindam, Analisa Rembesan, Geo Studio SEEP/W |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction) T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) T Technology > TC Hydraulic engineering. Ocean engineering > TC167 Dams, reservoirs |
| Divisions: | Faculty of Civil Engineering and Planning > Civil Engineering > 22201-(S1) Undergraduate Thesis |
| Depositing User: | Aria Khoirun Nisa |
| Date Deposited: | 12 Jul 2024 03:40 |
| Last Modified: | 12 Jul 2024 03:41 |
| URI: | http://repository.its.ac.id/id/eprint/67637 |
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