Analisis Rembesan pada Tubuh Bendungan Bagong Kabupaten Trenggalek

Aryananda, Bagas (2023) Analisis Rembesan pada Tubuh Bendungan Bagong Kabupaten Trenggalek. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pembangunan bendungan merupakan salah satu bentuk pemanfaatan sumber daya air di Indonesia. Selain fungsi dan pemanfaatan yang berpotensi di indonesia bendungan juga memiliki bahaya yang besar, oleh karena itu perlu diperhatikan secara terperinci perencanaan suatu bendungan. Begitu pula dalam perencanaan pembangunan Bendungan Bagong Kabupaten Trenggalek, Bendungan Bagong memiliki tinggi 82 m dan volume tampungan sebesar 17,44 juta m3 dimana menurut The International Commision on Large Dam (ICOLD) Bendungan Bagong termasuk jenis Bendungan Besar (Large Dams) yang termasuk terdapat kesulitan-kesulitan khusus pada analisa pondasi dan tubuh bendungan karena tidak didesain seperti bendungan biasanya. Selain itu karena tubuh bendungan bagong yang bertipe urugan zonal dengan inti tegak bendungan tipe ini memiliki material pori atau void lebih besar dibandingkan bendungan tipe beton/aspal, maka perlu dilakukan perhitungan yang terperinci mengenai hal tersebut, agar tidak terjadi hal-hal yang merugikan. Rembesan air (seepage) dapat diatasi salah satunya dengan cara menganalisis menggunakan program bantu Geo-Studio, aplikasi ini dapat mengidentifikasi alur garis depresi maupun kecepatan dan debit rembesan yang melalui tubuh bendungan. Analisis yang dilakukan meliputi kondisi Muka Air Normal (MAN), Muka Air Banjir (MAB), Surut Cepat (rapid drawdown) dan Dead Storage. Analisis akan menghasilkan Pola rembesan (garis depresi), Debit rembesan dan Kecepatan rembesan. Hasil dari penelitian ini adalah debit banjir QPMF sebesar 537.438 m3/detik dan tidak terjadi overtopping akibat debit banjir rancangan QPMF. Besarnya debit rembesan GeoStudio sebesar 5.82 x 10-3 m3/s dibandingkan dengan debit rembesan manual sebesar 5.98 x 10-3 m3/s tidak memiliki perbedaan terlalu besar yakni 2.672% dengan perbedaan debit sebesar 0.00016 m3/s. Safety of Factor longsoran paling kritis terdapat pada permodelan MAB (Muka Air Banjir) pada lokasi Hilir sebesar 1.671. Kecepatan kritis tertinggi terjadi pada material rip – rap dan timbunan setinggi 4.04 x 10-1 pada permodelan MAN. Batas kritis diameter untuk material paling kritis (paling kecil) yang akan terbawa terdapat pada material clay dengan diameter kritis 5.61 x 10-14 cm. Safety of factor gejala sufosi menunjukkan angka paling kritis pada permodelan MAN dengan angka sebesar 4.51. Debit rembesan masih dalam syarat aman karena debit yang terhitung melewati tubuh bendung masih 0.062 m3/s lebih sedikit dibandingkan debit ijinnya.
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Dam construction is one form of utilization of water resources in Indonesia. In addition to the potential functions and uses in Indonesia, dams also have great hazards, therefore it is necessary to pay attention to the detailed planning of a dam. Likewise, in the planning for the construction of the Bagong Dam, Trenggalek Regency, the Bagong Dam has a height of 82 m and a storage volume of 17.44 million m3 where according to The International Commission on Large Dam (ICOLD) the Bagong Dam is a type of Large Dam (Large Dams) which includes special difficulties in the analysis of the foundation and body of the dam because it is not designed like a normal dam. In addition, because the body of the bagong dam, which is of the zonal backfill type with an upright core of this type of dam, has larger pore or void material than a concrete/asphalt type dam, it is necessary to carry out detailed calculations regarding this matter, so that adverse events do not occur.
One way to overcome water seepage (seepage) is by analyzing it using the Geo-Studio auxiliary program, this application can identify the depression line flow as well as the speed and discharge of seepage through the body of the dam. The analysis carried out includes the conditions of the Normal Water Level (MAN), Flood Water Level (MAB), Rapid Drawdown and Dead Storage. The analysis will produce a seepage pattern (depression line), seepage discharge and seepage velocity. The results of this study are that the QPMF flood discharge is 537,438 m3/second and there is no overtopping due to the QPMF designed flood discharge. The magnitude of the GeoStudio seepage discharge of 5.82 x 10-3 m3/s compared to the manual seepage discharge of 5.98 x 10-3 m3/s does not have too large a difference of 2.672% with a difference in discharge of 0.00016 m3/s. The most critical avalanche Safety of Factor is found in the MAB (Flood Water Level) modeling at the Downstream location of 1,671. The highest critical speed occurs in rip-rap material and embankments as high as 4.04 x 10-1 in the MAN model. The critical diameter limit for the most critical (smallest) material to be carried is found in clay material with a critical diameter of 5.61 x 10-14 cm. The safety factor of sufficiency symptoms shows the most critical number in the MAN modeling with a value of 4.51. The seepage discharge is still in safe condition because the calculated discharge passing through the body of the weir is still 0.062 m3/s less than the permit discharge.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Bagong Dam, Dam Body, Seepage Analysis, Seepage Control, Seepage Discharge, Geo-Studio, Bendungan Bagong, Tubuh Bendungan, Analisis Rembesan, Kontrol Rembesan, Debit Rembesan, Geo-Studio
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC167 Dams, reservoirs
Divisions:	Faculty of Vocational > Civil Infrastructure Engineering (D4)
Depositing User:	Bagas Aryananda
Date Deposited:	04 Aug 2023 05:42
Last Modified:	08 Aug 2023 01:39
URI:	http://repository.its.ac.id/id/eprint/102678

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