Ahmad Na`im, Musyafiq (2015) Simulasi kestabilan konsolidasi-dam di hilir Syphon Lemurung Kali Konto terhadap fungsi beban statis dan dinamis. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Gunung Kelud berada di wilayah Kabupaten Kediri Jawa
Timur. Pasca erupsi pada awal tahun 2014, Gunung Kelud
menyisakan sejumlah material vulkanik yang masih tertahan di
lereng gunung berupa abu, pasir dan kerikil. Material tersebut
apabila bercampur dengan air akan membentuk suatu aliran yang
disebut lahar dingin. Tingginya curah hujan dan kondisi lereng
yang curam dapat menimbulkan aliran lahar yang memiliki daya
rusak tinggi. Untuk mengurangi dampak negatif tersebut, perlu
dibuat suatu bangunan pengendali sedimen yang diletakkan pada
sungai-sungai yang berpotensi dilalui aliran lahar dingin. Ada
beberapa macam bangunan pengendali anatara lain check dam,
konsolidasi dam, tanggul pengarah, dan kantong pasir. Bangunan
konsolidasi dam Syphon Lemurung merupakan salah satu upaya
mengurangi dampak bencana yang diakibatkan oleh bahaya aliran
lahar Gunung Kelud yang melewati aliran Kali Konto. Bangunan
konsolidasi dam memiliki fungsi utama untuk melindungi
bangunan syphon lemurung dari gerusan sedimen.
Aliran sedimen mengisi kapasitas tampung secara cepat
maupun lambat tergantung skala dan interval debit yang mengalir.
Apabila pada kondisi tertentu, gaya lawan akibat material
tampungan lebih besar daripada gaya tahan dari bangunan maka
tidak memenuhi syarat kestabilan. Kondisi tersebut menyebabkan
bangunan konsolidasi dam mengalami keruntuhan. Simulasi kestabilan terhadap variasi beban statis dan dinamis dilakukan
dengan menambah variasi parameter kondisi tampungan yang
berbeda. Parameter simulasi yang digunakan antara lain kondisi
material, berat jenis material, dan ketinggian material. Sehingga
didapat nilai kestabilan konsolidasi dam terhadap kontrol guling,
geser dan ambles. Selain itu juga dilakukan simulasi terhadap
variasi rasio kelangsingan dari konsolidasi dam Syphon
Lemurung, sehingga diketahui dimensi bangunan yang paling
efektif.
Dari hasil analisa didapatkan kapasitas volume
tampungan sedimen maksimum konsolidasi dam Syphon
Lemurung adalah 30926,25 m3. Laju sedimen pada Kali Konto
adalah 67,1875 m3/hari. Waktu untuk memenuhi tampungan
sedimen adalah 460 hari. Dari hasil simulasi kestabilan diketahui
semakin tinggi massa jenis material (W) maka semakin rendah
kestabilan bangunan. Syarat kestabilan mempengaruhi ketinggian
tampungan sedimen pada kondisi kritis. Dari hasil simulasi rasio
kelangsingan didapatkan dimensi rencana yang memenuhi syarat
kestabilan adalah tinggi dam (h1) = 1m – 5m dan lebar dam (b) =
8m - 10m. Sehingga dimensi eksisting konsolidasi dam Syphon
Lemurung merupakan dimensi yang sudah efektif.
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Mount Kelud is located in Kediri, East Java. After the
eruption in early 2014, it leave a number of volcanic material
which was still deposited on the mountain’s slope in form of ash,
sand and gravel. These materials transform to be cold lava flow
when mixed with water. The high intensity and steep slope
conditions could cause lava flow that has high destructive power.
To reduce the negative impact, a sediment control structures
should be built across rivers that potentially be passed by cold
lava flow. There are several kinds of control structures among
others check-dam, consolidated-dam, crib and sandbag.
Consolidated-dam of Lemurung Syphon is one example to reduce
the disaster caused by the danger of lava flow that passes through
Konto River. Consolidatied-dam building has a primary function
to protect the building Lemurung Syphon of scouring sediment.
Transport sediment will fill the capacities either quick or
slow depend on the scale and interval of discharge. When in
certain conditions, the opponent force as a result of the storage
material is greater than the resistant force of the building so not
qualify stability requirement. This condition causes the
consolidated-dam building collapse. Stability simulation on static
and dynamic load variations done by adding the parameter
variations of different storage conditions. Parameters simulation
that are used includes material conditions, material density, and
height of the material. So the value of stability the consolidated dam can be obtained against rolling, sliding and subsidence.
Simulation of the variation the slimness ratio of consolidated-dam
of Lemurung Syphon is also been done, so the most effective
dimensions of the building can be determined.
It can be concluded that sediment maximum capacity of the
storage volume consolidated-dam Lemurung Syphon is 30926.25
m3. The discharge of sediment at River Konto is 67.1875 m3/day.
The time to fulfill the storage sediment is about 460 days. From
the simulation results, it is known that the higher the density of
the material (W), the lower the stability of the building. Stability
requirement affects the height of the sediment reservoirs in
critical condition. From the simulation results determained
dimensional the slimness ratio qualified plan is the high stability
of the dam (h1) = 1m - 5m and width dam (b) = 8m - 10m. So the
dimensions of the existing consolidated-dam Lemurung Syphon, it
is found that the effective.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSS 627.8 Mus s |
| Uncontrolled Keywords: | Kestabilan; Konsolidasi Dam; Simulasi |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC167 Dams, reservoirs |
| Divisions: | Faculty of Civil, Environmental, and Geo Engineering > Civil Engineering > 22201-(S1) Undergraduate Theses |
| Depositing User: | - Taufiq Rahmanu |
| Date Deposited: | 01 Oct 2019 06:56 |
| Last Modified: | 01 Oct 2019 06:56 |
| URI: | http://repository.its.ac.id/id/eprint/70933 |
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