文档介绍：英文原文
PROSPECTS ESTIMATION OF KNOWN SYSTEMS APPLICATION FOR COAL SEAMS MINING AT GREAT DERTH
Leningrad Mining Institute
Abstract: Estimation of present and future situation in technological schemes on coal mining at great depth applying highly productive plexes is presented here, Stis shown that the decrease both in operation concentration and the share of pillar mining at deep mines is connected with increasing difficulties in development working support behind the face as well as prevention of roof caving in face area.
Introduction:
Underground coal mining efficiency depends at Iarge extent on technical economic indices of deep mines, the level of their development being steadily increased. In transition to deeper levels specific expenditures increase parallel with the deterioration of geological conditions in coal seams mining. At mines of sk basin where seams are mined at a depth of 500m ad more, the depth increase for every 100m results in production cost to 3-4%,here labour productivity of miners decreases in 6-8%[1].
One of the main effective ways to neutralize negative depth influence on under-round coal mining efficiency is to increase average daily face output on the basis of plex mechanization in stopping.
At non-gassy mines the application of long pillar mining leads to face output in - pared to average daily face output in bined methods