FATURRAHMAN, ISNAWAN (2021) ANALISIS KESTABILAN LERENG PADA PENAMBANGAN BATUBARA BLOK UTARA PIT KUSAN BAWAH PT. SAPTAINDRA SEJATI BORO, KABUPATEN TANAH BUMBU, KALIMANTAN SELATAN. Other thesis, UPN "Veteran" Yogyakarta.
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Abstract
v
RINGKASAN
PT. Saptaindra Sejati Jobsite Boro adalah salah satu perusahaan kontraktor
pertambangan batubara yang terletak di Kabupaten Tanah Bumbu, Kalimantan
Selatan. Dengan adanya kemajuan penambangan pada Section A-A’, Section BB’ dan Section C-C’ yang memiliki geometri lereng dengan kedalaman antara 13
– 25 m dan sudut lereng keseluruhan 130 - 370, sehingga perlu dilakukannya
analisis kestabilan lereng.
Perhitungan faktor keamanan menggunakan metode kesetimbangan batas
pada dinding highwall yang berpotensi longsoran busur mnggunakan metode
Bishop sedangkan dinding lowwall yang berpotensi longsoran bidang
menggunakan metode Mogenstern-Price, Analisis probabilistik serta dengan
pendekatan perhitungan kriteria keruntuhan Mohr Coulomb. Permodelan
dilakukan dengan pendekatan sifat fisik dan mekanik batuan hasil uji
laboratorium. Analisis lereng keseluruhan menggunakan kondisi muka air tanah
kering, 8H, 4H, 2H, dan jenuh menurut Hoek&Bray (1981), faktor seismik
bernilai 0,03g dengan asumsi beban alat mekanis diabaikan. Lereng kesluruhan
dianggap stabil apabila FK >1,3 (sesuai dengan Keputusan Menteri Energi dan
Sumber Daya Mineral Republik Indonesia No. 1827 K/30/MEM/2018)
Berdasarkan analisis menggunakan metode kesetimbangan batas dengan
program Rocsciense Slide V.6 didapatkan alternatif geometri lereng dengan
asumsi kondisi muka air tanah kering, jenuh, 8H, 4H, dan 2H. Pada Section A-A’
LowWall sudut lereng keseluruhan 290, tinggi lereng 16,8 m, kondisi muka air
tanh jenuh dengan PL 2,5%. Section B-B’ HighWall sudut lereng keseluruhan 240,
tinggi lereng 26,9 m, kondisi muka air tanh jenuh dengan PL 1,75%. Section C-C’
HighWall sudut lereng keseluruhan 130, tinggi lereng 51 m, kondisi muka air tanh
jenuh dengan PL 4%.
Kata Kunci : :Kestabilan lereng, Metode Kesetimbangan Batas, Muka Air Tanah,
Faktor Keamanan (FK) dan Probabilitas Kelongsoran (PK)vi
SUMMARY
PT Saptaindra Sejati is one of the coal mining contracting companies
located in Tanah Bumbu District, South Kalimantan. The progress of mining to
the west on Section A-A’ and Section B-B’ which has the geometry of the slope
with a depth between 13 - 25 m and an overall slope angle of 130 - 370, so it is
necessary to analyze slope stability.
Safety factor calculations us the limit equilibrium method, on highwall
which has the potential for circular failure using the Bishop method while lowwall
which has the potential of non-circular failure using the Morgenstern Price
method, probabilistic analisys and the approach to calculating mohr-coulomb’s
failure criteria. Modlling is done by approaching the physical and mechanical
properties of rock from laboratory test result. Ovrall slope analysis uses ground
water level conditions dry, 8H, 4H,2H, and saturated according to Hoek & Bray
(1981), seismic factors are valued at 0,03g and assuming the burden of mchanical
device is ignored. The overall slope is stable if FK>1,3 (according to the Decree
of the Minister of Energy and Minral Resources of the Republic of Indonesia No.
1827 K/30/MEM/2018).
Based on the analysis using the limit equilibrium methods with Rocsciense
Slide V.6 program, the geometry of slope alternative is obtainedwith the
assumption of dry, saturated, 8H, 4H, and 2H groundwater conditions. In Section
A-A’ Highwall overall slope is 190, slope height 24 m, ground water condition
saturated with PoF 1,2%. Lowwall overall slope is 480, slope height 13 m with
PoF0%. In Section B-B’ Highwall overall slope is 150, slope height 25 m, ground
water condition saturated with PoF 3,3%. Lowwall overall slope is 450, slope
height 25 m with PoF 0%, grounf water saturated .
Keywords : Slope stability, Boundary Equilibrium Method, Groundwater Level,
Safety Factor (FK) and Landslide Probability (PL)
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Kestabilan lereng, Metode Kesetimbangan Batas, Muka Air Tanah, Faktor Keamanan (FK) dan Probabilitas Kelongsoran |
| 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: | 09 Dec 2021 03:40 |
| Last Modified: | 14 Nov 2022 07:05 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/27253 |
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