Thin, level and steep seam equipment used in the donets basin
Journal Article
·
· World Coal; (United States)
OSTI ID:6608469
While conditions of working thin seams in the Donets coalfield differ only slightly from those in many other coal producing countries, the precise method of working steep seams in the Donbass has no parallel anywhere else in the world. First of all in the regions where steep seams are found it is usually geographically complex. The frequency of faults is 1.43 per 1,000 m along the strike. The average length of faulted zone reaches 200 m, length of unfaulted zone, 520 m, the share of seams with weak adjoining rocks equals 60%. The thickness of seams being worked varies from 0.4 to 2.2 m. Depth of working averages 665 m, and it increases by 15 to 18 m yearly. At some mines, various seams have been worked at a depth of more than 1,000 m. Nearly all the seams are gassy, and with increasing depth of working gas emission builds up until it reaches 100 m/sup 3/ per ton of coal output daily. The number of seams subject to outbursts of firedamp and coal is also increasing: at present they account for 54%, and seams of coal liable to spontaneous combustion account for a further 6%. The combination of these factors was the main reason which prevented the mechanized development of these seams in the past. Two solutions were found to these problems firstly, an attempt was made to adapt well proven methods of mechanized working of faces in level seams to mechanized working of steep seams, namely longwall faces equipped with power-loaders and mechanized supports advancing along the line of strike, and secondly, the development of a new system, that of shield supports and associated equipment advancing along the dip.
- OSTI ID:
- 6608469
- Journal Information:
- World Coal; (United States), Journal Name: World Coal; (United States) Vol. 4:8; ISSN WOCOD
- Country of Publication:
- United States
- Language:
- English
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