SIMANJUNTAK, ARYO ROBINSAR (2017) ANALISIS KEMANTAPAN LERENG KUARI B7 BATUGAMPING DI PT. SEMEN TONASA, DESA BIRINGERE, KECAMATAN BUNGORO, KABUPATEN PANGKEP, PROVINSI SULAWESI SELATAN. Other thesis, Universitas Pembangunan Nasional "Veteran" Yogyakarta.
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Abstract
PT. Semen Tonasa is one of the big limestone company in Indonesia that
using surface mining system and quarry method. The research did in Quarry B7
that has bench geometry are 30 cm of height and 80
vi
o
of slope angle with rock
condition has many discontinuities are joints. The unsafe of bench geometry will
endanger the workers and equipments that important to know slope stability is
consideration in the aspect of Occupational Health and Safety in mining activities.
To get the good and safe slope design, then need to observe mass rock
characteristic. The important factor of mass rock characteristic is intrinsic factors
are cohesi (c) and friction angle (Φ). The result of laboratory testing, limestone
has 517,5 kg/cm
2
of UCS with 0,88 kg/cm
2
of cohesi and 64
o
of friction angle. By
using Software Dips v5.0 , the potential of slope that happened in Quarry B7 can
be known there is plane failure, then analysis of slope stability is using plane
failure calculation. Factor safety (FS) values that obtained are 3,16 (dry condition)
and 1,26 (wet condition). Mass rock classification for limestone is using Rock
Mass Rating or RMR (Bienawski, 1989) method with value of RMR is 77 that
include in group II with good rock condition.
Recommendation of bench geometry is made with simulation for bench
height from 10 – 50 m with slope angle is 80
o
- 85
o
in dry and wet condition to
find out whether need or not new geometry is created. Slope in Quarry B7 has
middle risk and no earthquake that has FS is 1,5 (maximum or for overall slope)
by Director General of General Mining. Lereng di Kuari B7 masuk dalam resiko
menengah dan kondisi tanpa gempa yang memiliki nilai faktor keamanan yaitu
1,50 (maksimum atau untuk oveall slope) berdasarkan Direktorat Jendral
Pertambangan Umum That, from result of FS there need recommendation new
geometry in Quarry B7 with height bench is 25 m and slope angle 85
has FS is
1,7 in wet condition and 2,51 in dry condition.
| 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: | 19 Jan 2018 02:34 |
| Last Modified: | 08 May 2024 01:02 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/14264 |
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