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

Frekvencija događ<br />
45<br />
40<br />
35<br />
30<br />
25<br />
20<br />
15<br />
10<br />
5<br />
0<br />
Incidentni događaji<br />
Period 11992-2008<br />
Chart 1. Recorded incidents and their frequency<br />
5.1. description of incidental events<br />
1. Fire was the most frequent incident<br />
in this period. Based on inspection<br />
of data sources, it was found that the<br />
registered number does not refer to<br />
the actual fire occurrences, but this<br />
issue was on the agenda of the Rescue<br />
Service Headquarters. Registered<br />
number of occurrences in the<br />
agenda was taken as the basis for<br />
further analyses. Registered fires<br />
occurred at longwall faces, old sites<br />
and power transformer stations.<br />
2. Penetrations were also frequent on<br />
the meeting agendas. The registered<br />
number includes penetrations<br />
to the old mining sites and already<br />
closed rooms, as well as penetrations<br />
that required air regulation or<br />
changes in ventilation regime.<br />
3. Other incidents were highly frequent,<br />
but are not of great importance,<br />
except for the cases of fatalities<br />
at conveyors, which are also<br />
classified in this category.<br />
4. Gas situation analysis followed<br />
occurrence of high concentrations<br />
of methane (CH4) at preparatory<br />
Požari 41<br />
Proboji 37<br />
Ostalo 32<br />
Plinovi 15<br />
CO plin 13<br />
Likv.čela 11<br />
Prorušci 7<br />
sites or occurrence of carbon dioxide<br />
(CO2) in deeper parts of pits,<br />
after withdrawal of water or from<br />
old mining sites.<br />
5. CO gas occurrence refers to occurrence<br />
of CO gas in the fronts<br />
behind walls at old mining sites, at<br />
longwall faces and elsewhere.<br />
6. Closure of longwall face is one of<br />
the most complex operations in underground<br />
mining. In this process,<br />
there are often incidents in terms of<br />
difficulties during excavation,<br />
transportation or in persistence<br />
process of self-propelled hydraulic<br />
support sections.<br />
7. Cavities are dynamic occurrences<br />
with possibly fatal consequences,<br />
along with reparation difficulties.<br />
6. RISK DETERMINATION<br />
(PROBABILITIES AND EFFECTS)<br />
AND RISK ASSESSMENT<br />
After listing hazards and their causes,<br />
it is necessary to assess the risks for each<br />
of them. In this context, it means to assess<br />
the probabilities that the adverse effects<br />
No 4, 2011. 124<br />
MINING ENGINEERING