YUSUF, FERY (2014) RANCANGAN GEOMETRI LERENG PENAMBANGAN BATUBARA PADA PT.GOLDEN GREAT BORNEO DI KABUPATEN LAHAT PROVINSI SUMATERA SELATAN. Other thesis, UPN "Veteran" Yogyakarta.
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Abstract
PT. Golden Great Borneo merupakan perusahaan pertambangan batubara
yang terletak di Desa Prabumenang, Kec. Merapi Timur, Kab Lahat, Provinsi
Sumatera Selatan. PT. Golden Great Borneo merencanakan pekerjaan
penambangan dengan metode tambang terbuka. Sebelum kegiatan penambangan
dimulai perlu dilakukan perancangan terhadap geometri lereng yang akan
diterapkan dengan tujuan untuk mengetahui tingkat kestabilan lereng yang
ditunjukkan oleh angka Faktor keamanan (FK).
Penelitian dilakukan dengan melakukan pemboran geoteknik, melakukan
uji sampel di laboratorium sehingga diperoleh nilai sifat fisik dan mekanik batuan
di daerah penelitian. Hasil uji kuat tekan terhadap material di daerah penelitian
berkisar antara 0,08 – 3,40 MPa, berdasarkan klasifikasi yang dikeluarkan oleh
Bieniawski (1973) dapat dilihat bahwa batuan di daerah penelitian termasuk
batuan sangat lemah (very low strength) karena memiliki nilai kuat tekan < 25
MPa. Asumsi longsor yang terjadi dengan menggunakan pendekatan tersebut
adalah longsor busur (circular failure).
Perhitungan analisis rancangan pada lereng tunggal dilakukan dengan
metode Chart Hoek and Bray dan lereng keseluruhan menggunakan metode
kesetimbangan batas dengan metode Bishop dan metode Probabilitas. Perhitungan
menggunakan program perangkat lunak Slide 6.0 untuk metode Bishop dan
program Galena v 5.02 dengan lisensi resmi dari UPN “Veteran” Yogyakarta
untuk metode Probabilitas.
Pemodelan lereng tunggal dilakukan pada masing-masing litologi dengan
simulasi tinggi 14 meter dan 15 meter dengan sudut kemiringan 50o, 55o, 60o, 65o,
dan 70o dimana lereng tunggal dianggap mantap jika memiliki FK > 1,3. Analisis
rancangan lereng keseluruhan dengan membuat dua penampang, yaitu
penampang D-D’ dan E-E’ yang mewakili daerah penelitian, lereng dianggap
mantap jika memiliki nilai FK > 1,5.
Kohesi (c), sudut geser dalam (), dan bobot isi () digunakan sebagai
parameter perhitungan maka diperoleh FK > 1,3 untuk lereng tunggal, dan untuk
lereng keseluruhan diperoleh nilai probability of failure 6% untuk penampang DD’
dan 8% untuk penampang E-E’ sehingga lereng dapat dikatakan stabil
berdasarkan kriteria dari Santamrina, Altsceffl, and Chameu, 1992.
PT. Golden Great Borneo is a coal mining company located in
Prabumenang, Lahat district, South Sumatera Province. PT. Golden Great Borneo
planned mining operation by open pit mining. Therefore before mining began, it is
necessary to design the slope geometry to be applied in order to determine slope
stability which indicated by Factor of Safety (FoS).
The study was conducted by geotechnical drilling, sample test in the
laboratory in order to obtain the value of the physical and mechanical properties
of rocks in the study area. Compressive strength test results of the material in the
study area ranged from 0.08 – 3.40 MPa, based on the classification proposed by
Bieniawski (1973) the rocks in the study area can be classified as very low
strength rock because it has a compresseive strength value below 10 MPa. The
assumption for the slope failure based on that approach is circular failure.
Design analysis calculations on a single slope was performed by Hoek and
Bray chart method and the overall slopes using Limit Equilibrium Method with
Bishop Method and Probability approach. The process of calculating with Bishop
Method facilitated by using the Slide 6.0 software and the Probability approach
facilitated by using Galena ver. 5.02 software with official license from UPN
“Veteran” Yogyakarta.
Single slope modeling performed on each lithology with simulated 14
meters high and 15 meters at the slope of 55°, 60°, 65°, 70°, 75° are considered
stable if it’s value of FoS greater than 1.3. The overall slope analysis performed
by making two cross section that is section D-D’ and section E-E’ representing of
research area considered stable if it’s value of FoS greater than 1.5 and for the
probability approach method considered stable if it’s value of probability of
failure is lesser than 10%.
The FoS for all single slope are greater than 1.3, indicated that single slope
stable, and for the overall slope using cohession (c), friction angle (θ) and density
(γ) as a parameter obtained value of probability of failure 6% for section D-D’ and
8% for section E-E’ it’s indicated that slope are stable based on Santamarina,
Altschefft and Chameau, 1992 criteria.
| Item Type: | Thesis (Other) |
|---|---|
| Subjek: | T Technology > TN Mining engineering. Metallurgy |
| Divisions: | x. Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Eko Suprapti |
| Date Deposited: | 25 May 2016 02:27 |
| Last Modified: | 25 May 2016 02:27 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/2372 |
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