Widodo, Anang Setyo Aji (2023) Alternatif Perencanaan Inti Tubuh Bendungan Menggunakan Material Geomembrane. Other thesis, Institut Teknologi Sepuluh Nopember.
![[thumbnail of 03111840000062-Undergraduate_Thesis.pdf]](http://repository.its.ac.id/style/images/fileicons/text.png) |
Text
03111840000062-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only until 1 April 2023. Download (8MB) | Request a copy |
Abstract
Bendungan Semantok merupakan bendungan yang terletak di Kecamatan Rejoso Kabupaten Nganjuk dengan panjang total mercu bendungan adalah 3.005 m dan tinggi tubuh bendung 26 m dengan jenis urugan tipe zonal. Tubuh bendungan Semantok menggunakan 5 jenis material alam sebagai penyusunnya yaitu; clay sebagai inti; pasir sebagai filter halus; kerikil sebagai filter kasar; random tanah sebagai material dominan; serta material riprap dan rocktoe sebagai lapisan permukaan. Bendungan Semantok memiliki inti bendung dengan material tanah lunak clay dimana material tersebut sudah memenuhi syarat untuk mengatasi masalah rembesan di tubuh bendung. Sedangkan secant pile yang dipasang di bawah bendungan digunakan untuk mengatasi rembesan di bawah tubuh bendungan. Mengingat material inti bendung memerlukan material clay yang cukup banyak dengan pemadatan yang tinggi, maka perlu direncanakan alternatif pemakaian material geosintetik yang kedap sehingga ketebalan dari inti bendung dapat dikurangi. Oleh sebab itu, perlu direncanakan ketebalan dari inti bendung yang merupakan kombinasi antara clay dan geomembrane agar persyaratan stabilitas dan rembesan pada bendung dapat terpenuhi. Untuk itu, analisis terhadap kombinasi penggunaan geomembrane pada berbagai variasi ketebalan zona inti akan dilakukan. Hasil analisis tersebut akan dibandingkan dengan perencanaan bendungan eksisting. Analisis akan dilakukan dengan menggunakan perhitungan manual dan program bantu Geo-Studio; program Seep/W digunakan untuk melihat rembesan dan garis freatik dan program Slope/W untuk menunjukkan stabilitas bendungan. Dari hasil penelitian didapatkan bahwa dengan tanah pondasi yang digunakan memerlukan perpanjangan cutoff dari desain eksisting hingga mencapai tanah keras dengan nilai permeabilitas lebih rendah di bawahnya. Dari beberapa ketebalan zona inti yang dianalisis, penggunaan material geomembrane HDPE 2 mm menunjukkan hasil bahwa ketebalan minimum zona inti dengan kombinasi material geomembrane yang masih memenuhi syarat rembesan dan stabilitas adalah sebesar 2/3 dari ketebalan eksisting. Garis freatik juga menunjukkan bahwa terjadi penurunan yang signifikan dari zona inti hingga ujung bendungan. Analisis dengan memperhitungkan pengaruh beban gempa OBE 100 tahun aman, tapi pada MDE 10.000 mengalami kerusakan minimum yang masih memenuhi syarat 50% tinggi jagaan yaitu dengan nilai deformasi penurunan puncak 15,36 cm
====================================================================================================================================
The Semantok Dam is a dam located in Rejoso District, Nganjuk Regency with a total length of the dam crest of 3,005 m and a body height of 26 m with a zonal backfill type. The body of the Semantok dam uses 5 types of natural materials as constituents, namely; clay as core; sand as a fine filter; gravel as a coarse filter; random soil as the dominant material; as well as riprap and rocktoe materials as surface layers. The Semantok Dam has a weir core made of clay soft soil material which meets the requirements to overcome seepage problems in the body of the weir. Meanwhile, secant piles installed under the dam are used to overcome seepage under the body of the dam. Considering that the weir core material requires quite a lot of clay material with high compaction, it is necessary to plan alternative uses of impermeable geosynthetic materials so that the thickness of the weir core can be reduced. Therefore, it is necessary to plan the thickness of the weir core which is a combination of clay and geomembrane so that the stability and seepage requirements of the weir can be fulfilled. For this reason, an analysis of the combined use of geomembrane at various thicknesses of the core zone will be carried out. The results of the analysis will be compared with the existing dam planning. The analysis will be carried out using manual calculations and the Geo-Studio assist program; the Seep/W program is used to view seepage and phreatic levels and the Slope/W program is used to show dam stability. From the research results it was found that the foundation soil used required an extension of the cutoff from the existing design to reach hard soil with a lower permeability value below. From the several thicknesses of the core zone analyzed, the use of 2 mm HDPE geomembrane material shows the results that are thick the minimum core zone with a combination of geomembrane material that still meets the seepage and stability requirements is 2/3 of the existing thickness. The phreatic line also shows that there is a significant decrease from the core zone to the end of the dam. Analysis taking into account the influence of the 100 year OBE earthquake load is safe, but at MDE 10,000 it experiences minimum damage which still meets the requirements of 50% of guard height, namely with a peak settlement deformation value of 15.36 cm
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Bendungan Semantok, inti bendung, geomembrane, stabilitas, rembesan |
| Subjects: | T Technology > T Technology (General) T Technology > T Technology (General) > T57.62 Simulation T Technology > TA Engineering (General). Civil engineering (General) > TA169.5 Failure analysis T Technology > T Technology (General) > TA404 Materials--Biodegradation T Technology > TA Engineering (General). Civil engineering (General) > TA455.S6 Soil (Materials of engineering and construction) T Technology > TA Engineering (General). Civil engineering (General) > TA749 Soil stabilization T Technology > TH Building construction > TH1095 Earthquakes and building |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22201-(S1) Undergraduate Thesis |
| Depositing User: | ANANG SETYO AJI WIDODO |
| Date Deposited: | 04 Feb 2023 08:56 |
| Last Modified: | 04 Feb 2023 08:56 |
| URI: | http://repository.its.ac.id/id/eprint/96164 |
Actions (login required)
 |
View Item |