Author(s):
1. Bogdan Makovšek, Premogovnik Velenje d.d., Slovenia
2. Ivan Pohorec, Premogovnik Velenje d.d., Slovenia
3. Gregor Uranjek, Premogovnik Velenje d.d., Slovenia

Abstract:
Velenje Coal Mine developed, with respect to the natural forces of fracturing and crushing of the coal layer, one of the most effective longwall top coal caving mining method for thick coal layers. "Velenje mining method" with collapsing of overburden strata in excavated area is developed since 1952. The process of controlled caving by pouring crushed coal in the front of flexible canopies and on the armored face conveyor allows very high extraction capacity with provided safety. This procedure, however, requires a good knowledge of caving processes "in situ", advanced excavation equipment and in particular, knowledge and experienced miners. Successful control of caving and continuous collapsing of excavated area is one of the key stages of the technological process for the efficient and above all safe extraction of coal. From the safety point of view, this means in particular the prevention of sudden inrush of coal gases in the work area of coalface as consequence of sudden collapse of overburden strata in the extracted area. Also, due to the impact of mining especially when the coalface is crossing the coal layer Faults or old works, the potential danger exists of an outbreak of coal gases in the area of coalface and gateways. This paper presents measures for safe excavation that are integrated in the Velenje Coal Mine’s "Prevention and protection plan” in the case of potential risks and at the occurrence of inrush or outbreak of coal gases in the area of coal face and gateways.

Key words:
Velenje mining method,inrush and outburst of coal mine gases,prevention and protection plan

Thematic field:
System engineering, risk management and modern trends

Date of abstract submission:
15.05.2017.

Conference:
7th Balkan Mining Congress

Final paper