Rudarski radovi br 4 2011 - Institut za rudarstvo i metalurgiju Bor

MINING AND METALLURGY INSTITUTE BOR YU ISSN: 1451-0162<br />
COMMITTEE OF UNDERGROUND EXPLOITATION OF THE MINERAL DEPOSITS UDK: 622<br />
UDK: 622.272:666.972 (045)=20<br />
Abstract<br />
Dragan Ignjatović*, Milenko Ljubojev * , Lidija Đurđevac Ignjatović * , Dušan Tašić *<br />
PHYSICAL AND MECHANICAL PROPERTIES OF<br />
ANCHOR MIXTURE APPLIED IN THE ORE BODY “T” **<br />
One of the materials, used for ensuring the stability in exploitation the ore body “T“ is the anchor<br />
mixture. It was necessary to check the physical and mechanical properties of anchor mixture<br />
because of its participation in the rock mass stability. The results of these tests are present in this<br />
paper.<br />
Key words: anchor mixture, ore body “T”, physical and mechanical properties<br />
INTRODUCTION<br />
Concrete is a heterogeneous, multiphase<br />
material, obtained by binding various<br />
types of aggregates with the cement<br />
paste. Aggregate present a linear elastic<br />
component and the cement paste is high<br />
elastic component.<br />
Mixing of concrete components in the<br />
controlled conditions is aimed to obtain<br />
more complete homogenization of mixture<br />
with properly bound aggregate and cement<br />
paste.<br />
On the request of the company<br />
Polimerinžekt Ltd. from Bulgaria, which<br />
carried out the works on ensuring the rock<br />
mass stability in exploitation the “T” ore<br />
body in the Bor pit mine, the samples of<br />
anchor mixture were tested on a compressive<br />
strength.<br />
Samples were delivered by Polimerinžekt<br />
Ltd.<br />
TESTS RESULTS<br />
Anchor mixture samples were delivered<br />
to the Laboratory for Geomechanics.<br />
Dimensions of the samples were 7.3 cm<br />
(diameter) and 7.5 cm (height), Figure 1.<br />
Figure 2 presents the appearance of<br />
samples after testing.<br />
* Mining and Metallurgy Institute Bor<br />
** This paper is produced from the project no. 33021 “Researching and monitoring changes in<br />
stress-deformation condition of rock massif “in-situ” around undergraund facilities with development<br />
of model with special emphasis on Krivelj river tunnel and Bor pit”, which is funded by<br />
means of the Ministry of Education and Science of the Republic of Serbia<br />
No 4, 2011. 33<br />
MINING ENGINEERING