Institut za rudarstvo i metalurgiju Bor

COMMITTEE OF UNDERGROUND EXPLOITATION OF YU ISSN: 1451-0162
THE MINERAL DEPOSITS UDK: 622
UDK: 622.271:681.33(045)=20
Radmilo Rajković*, Daniel Kržanović * , Ružica Lekovski *
STABILITY ANALYSIS OF INNNER WASTE DUMP “KUTLOVACA”
OF THE COAL OPEN PIT MINE “POTRLICA“– PLJEVLJA USING
THE GEOSTUDIO 2007 SOFTWARE
Abstract
This work presents the results of stability calculation the inner waste dump “Kutlovaca” of the
coal open pit mine “Potrlica“ within the “Pljevlja” Coal Basin. Stability calculation was made
using the GeoStudio 2007 software with its tools SLOPE/W, specialized for the limit equilibrium
conditions. Calculation was made using Morgenstern – Price, Bishop and Janbu. The impact of
ground water on stability was modeled by the pore water coefficient.
Key words: dumping, stability, GeoStudio 2007 software, pore water coefficient
INTRODUCTION
Coal open pit “Potrlica” is within the
Pljevlja coal basin. By dynamics of work
development at the open pit in the period
2010 – 2014, it was predicted that
10 920 000 m 3 of solid rock mass from the
open pit will be dumped at the existing
internal waste dump “Kutlovaca”, which
is located on the eastern part of open pit
[1]. Dumped material is mostly marl, with
much lower percentage of interlayer clay.
A diversity of lithological structures is
noticed in the ground of formed waste
dump, according to the lithological model
of deposit. Marl, two layers of coal and
interlayer floor clay are present.
Stability calculation of the internal waste
dump “Kutlovaca” was carried out by a
critical profile of GeoStudio 2007 software,
that is its tool COPE/W, which is specialized
in the limit equilibrium condition.
* Mining and Metallurgy Institute, Bor
INPUT DATA FOR STABILITY
CALCULATION
Lithological structure of the Potrlica
basin is complex. Many lithological members
are observed on each profile. Each
lithological member is determined by its
physical - mechanical characteristics. The
main coal layer generally outlines the
forms of paleorelief. Layers and interlayers
of floor clay particularly have negative
effect on the stability of works.
The area of open pit “Potrlica” is characterized
by extreme heterogeneity of anisotropy
and according to this the variations
are great in terms of physical - mechanical
indicators of represented rock masses.
Statistical analysis of physical - mechanical
indicators of represented rock
masses was made on the basis of existing
geomechanical data. The analysis was
carried out on a small and insufficient
No 1,2010. 75
MINING ENGINEERING