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Interaction of supports and surrounding strata in thick coal seams in the Kuznetsk coalfield

Interaction of supports and surrounding strata in thick coal seams in the Kuznetsk coalfield ROCK MECHANICS AND ROCK PRESSURE INTERACTION OF SUPPORTS AND SURROUNDING STRATA IN THICK COAL SEAMS IN THE KUZNETSK COALFIELD S. I. Zapreev and A. K. Kovrizhin UDC 622.281.002.5+622.831(571.17) Mechanized mining in thick seams is greatly hampered by difficult natural conditions and lack of knowledge of the nature of rock pressure. The seams in the Kuznetsk coalfield can be divided into three structural types: weak, moderately hard, and extremely hard. This classification is based on the cavability of the rock, which depends on the strength properties of the predominant component and the rock's structural characteristics. Rock pressure phenomena in faces with powered supports are similar to those in faces with conventional supports, though some quantitative difference is observed. The chief features of roof deformation and rock pressure manifestations are as follows. The caving intervals of the sUata differ, and they increase with the strength of the roof strata. For weak rocks the caving interval in the roof at present-day rates of face advance (as much as 1.0-1.5 m/day) is 10-12 m for the first caving, and for subse- qnent cavings 4-6 m; for rocks of average hardness these figures are 18-20 and 6-8 m respectively, and for hard (strong) rocks http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Mining Science Springer Journals

Interaction of supports and surrounding strata in thick coal seams in the Kuznetsk coalfield

Zapreev, S.; Kovrizhin, A.
Journal of Mining Science , Volume 2 (5) – Sep 1, 2006
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References (3)

Publisher
Springer Journals
Copyright
Copyright
Subject
Earth Sciences; Geotechnical Engineering & Applied Earth Sciences; Geophysics/Geodesy; Earth Sciences, general; Mineral Resources
ISSN
1062-7391
eISSN
1573-8736
DOI
10.1007/BF02497631
Publisher site
See Article on Publisher Site

Abstract

ROCK MECHANICS AND ROCK PRESSURE INTERACTION OF SUPPORTS AND SURROUNDING STRATA IN THICK COAL SEAMS IN THE KUZNETSK COALFIELD S. I. Zapreev and A. K. Kovrizhin UDC 622.281.002.5+622.831(571.17) Mechanized mining in thick seams is greatly hampered by difficult natural conditions and lack of knowledge of the nature of rock pressure. The seams in the Kuznetsk coalfield can be divided into three structural types: weak, moderately hard, and extremely hard. This classification is based on the cavability of the rock, which depends on the strength properties of the predominant component and the rock's structural characteristics. Rock pressure phenomena in faces with powered supports are similar to those in faces with conventional supports, though some quantitative difference is observed. The chief features of roof deformation and rock pressure manifestations are as follows. The caving intervals of the sUata differ, and they increase with the strength of the roof strata. For weak rocks the caving interval in the roof at present-day rates of face advance (as much as 1.0-1.5 m/day) is 10-12 m for the first caving, and for subse- qnent cavings 4-6 m; for rocks of average hardness these figures are 18-20 and 6-8 m respectively, and for hard (strong) rocks

Journal

Journal of Mining Science – Springer Journals

Published: Sep 1, 2006

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