ANALISIS STABILITAS LUBANG BUKAAN DALAM KEGIATAN PILLAR ROBBING TAMBANG BAWAH TANAH PT. ANEKA TAMBANG UBPE PONGKOR JAWA BARAT

FIRAZ, MUHAMMAD FATHIN (2019) ANALISIS STABILITAS LUBANG BUKAAN DALAM KEGIATAN PILLAR ROBBING TAMBANG BAWAH TANAH PT. ANEKA TAMBANG UBPE PONGKOR JAWA BARAT. Masters thesis, Universitas Pembangunan Nasional Veteran Yogyakarta.

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Abstract

PT. Aneka Tambang, Tbk Pongkor Gold Mining Unit applies the sublevel
stope and cut and fill method in its mining activities. Currently mining activities
have reached the final process. To achieve production achievement, locations that
have economic value will be carried out production activities. These locations are
sill pillars that are located between sublevels.
The study was conducted at one of the sill pillar locations that would be
carried out in production (exavation) activities, namely Cross Cut 10 Central in the
Ciurug veins. The purpose of this study was to obtain predictions of stope stability
based on strength factor parameters, safety factors and deformation (displacement),
as well as to propose the use of a buffer based on the 1989 Bieniawski rock mass
classification.
Stope stability analysis conducted in this study uses numerical modeling
methods by applying the finite element method with the help of roclab and phase 2
software from rocscience. Modeling and analysis will be carried out in 4 stages: the
first stage is the initial conditions, the second stage is the condition when excavated,
the third stage is the condition when installing rock reinforcement in the form of
rock bolts and stope support in the form of wiremesh, and the fourth stage is the
condition when installing rock reinforcement in the form shotcrete.
The results of this modeling and analysis are the stability value of the stope
for the strength factor parameter (Hoek-Brown Criteria) is still at a value <1.5. For
the parameter deformation (displacement) is at a value far enough below the
threshold 5 times the elastic displacement (Cording, 1974). The safety factor
parameter (Mohr-Coulomb Criteria) is > 2 shotcrete installation. The reinforcement
of rocks and support provided is in the form of 4 meter long rock bolts with 1 meter
spacing and shotcrete with a thickness of 3 centimeters on the wall and 10
centimeters on the roof.

Item Type:	Thesis (Masters)
Subjek:	T Technology > TN Mining engineering. Metallurgy
Divisions:	x. Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User:	Nurul Alifah Rahmawati
Date Deposited:	28 Aug 2019 06:59
Last Modified:	28 Aug 2019 06:59
URI:	http://eprints.upnyk.ac.id/id/eprint/20868

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