AL FALAQ, MUHAMMAD SAFRIUDIN (2024) EVALUASI INFRASTRUKTUR SISTEM PENYALIRAN TAMBANG UNTUK MENANGANI AIR LIMPASAN PADA PT SAMUDERA MULIA ABADI. Other thesis, UPN Veteran Yogyakarta.
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Abstract
v
RINGKASAN
Penelitian dilakukan di Pit Mainridge dan CP-01 PT Samudera Mulia Abadi.
Sistem penambangan yang digunakan adalah sistem tambang terbuka
menggunakan metode open pit. Permasalahan di lokasi penelitian yaitu terdapatnya
genangan air di pit mainridge akibat curah hujan yang tinggi. Selain itu, terjadi
pendangkalan kolam pengendapan akibat penumpukan endapan. Kegiatan
penambangan merupakan kegiatan yang berhubungan dengan alam, salah satu yang
berpotensi mengganggu kegiatan ini yaitu air tambang. Oleh karena itu, untuk
mengantisipasi kemajuan tambang ke arah yang lebih luas dan dalam, masalah
sistem penyaliran tambang ini harus diperhatikan dengan baik sehingga perlu
dilakukan evaluasi sistem penyaliran tambang. Penelitian ini menggunakan data
curah hujan dari tahun 2014-2023. Rata-rata curah hujan harian maksimum sebesar
99 mm. Hasil uji metode distribusi curah hujan dengan uji chi-kuadrat, uji smirnov-
kolmogorov, serta koefisien skewness dan kurtosis didapatkan metode gumbel
sebagai data perhitungan curah hujan rencana yang paling sesuai. Didapatkan nilai
curah hujan harian rencana sebesar 116 mm. Intensitas curah hujan sebesar 19
mm/jam dengan periode ulang hujan 3 tahun, serta resiko hidrologi 80%, dan rata-
rata durasi hujan 3,12 jam/hari. Pada area penelitian didapatkan tujuh Daerah
Tangkapan Hujan (DTH).
Pada lokasi penelitian terdapat 11 saluran terbuka dan 6 gorong-gorong
dimana berdasarkan perhitungan diperlukan perluasan dimensi di saluran terbuka
1, saluran terbuka 2, dan saluran terbuka 3, serta penambahan jumlah line di gorong-
gorong 4 agar mampu menampung debit air limpasan yang melaluinya. Selain itu,
diperoleh hasil rekomendasi dimensi rancangan saluran terbuka dan gorong-gorong
pada DTH I dan DTH II. Pompa yang dibutuhkan yaitu 2 buah Multiflo MF-
420EXHV dengan total debit pemompaan 2376 m3/jam dan waktu pemompaan 18
jam/hari dengan pipa yang digunakan yaitu pipa HDPE (High Density Polyetyline)
berdiameter 12 inch dan panjang pipa 325 m. Sementara itu, didapatkan
rekomendasi volume ceruk (sump) sebesar 55.153 m3. Kolam pengendapan
berjumlah 4 kolam dengan kolam 1 berjumlah 5 kompartemen, kolam 2 berjumlah
6 kompartemen, kolam 3 berjumlah 1 kompartemen, dan kolam 4 berjumlah 1
kompartemen dengan total luas 40.682 m2. Sedangkan berdasarkan perhitungan
didapatkan kebutuhan luas kolam pengendapan 29.931 m2 maka sudah terpenuhi.
Waktu pemeliharaan pada kolam 1 setiap 28 hari, kolam 2 setiap 305 hari, kolam 3
setiap 413 hari, dan kolam 4 setiap 1557 hari.
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SUMMARY
The research was conducted at Pit Mainridge and CP-01 of PT Samudera
Mulia Abadi. The mining system used is an open mining system using the open pit
method. The problem at the research location is the presence of standing water in
the mainridge pit due to high rainfall. In addition, there is siltation of the settling
pond due to sediment accumulation. Mining activities are activities related to
nature, one of which has the potential to disrupt this activity is mine water.
Therefore, to anticipate the progress of the mine to a wider and deeper direction,
the problem of the mine drainage system must be considered properly, so it is
necessary to evaluate the mine drainage system. This study uses rainfall data from
2014-2023. The average maximum daily rainfall is 99 mm. The results of the
rainfall distribution method test with the chi-squared test, smirnov-kolmogorov test,
and the skewness and kurtosis coefficients obtained the Gumbel method as the most
suitable rainfall calculation data. A daily rainfall value of 116 mm was obtained.
The rainfall intensity is 19 mm/hour with a rainfall return period of 3 years, as well
as a hydrological risk of 80%, and an average rainfall duration of 3.12 hours/day.
In the research area, seven catchments were found.
At the research location there are 11 open channels and 6 culverts where
based on calculations it is necessary to expand the dimensions in open channel 1,
open channel 2, and open channel 3, as well as increase the number of lines in
culvert 4 to be able to accommodate the runoff water discharge through it. In
addition, the results of recommendations for the design dimensions of open
channels and culverts at DTH I and DTH II were obtained. The pumps needed are
2 Multiflo MF-420EXHV with a total pumping discharge of 2376 m3 / hour and a
pumping time of 18 hours / day with the pipes used, namely HDPE (High Density
Polyetyline) pipes with a diameter of 12 inches and a pipe length of 325m.
Meanwhile, the recommended volume of the sump are 55.153 m3. There are 4
settling ponds with pond 1 totaling 5 compartments, pond 2 totaling 6
compartments, pond 3 totaling 1 compartment, and pond 4 totaling 1 compartment
with a total area of 40,682 m2. Meanwhile, based on the calculation, the settling
pond area requirement is 29,931 m2, so it has been fulfilled. Maintenance time in
pond 1 is every 28 days, pond 2 every 305 days, pond 3 every 413 days, and pond
4 every 1557 days.
| Item Type: | Thesis (Other) |
|---|---|
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Eko Yuli |
| Date Deposited: | 26 Jul 2024 02:45 |
| Last Modified: | 26 Jul 2024 02:45 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/40461 |
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