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Mechanization of longwall mining in coal seam with soft floor strata
Sloping about 7°, between 1.25 and 1.46 m thick coal seam is mined at depth of 500 to 600 m; steel props, pressed by overlaying coal seam strata into soft floor, could not support weak roof; switch to hydraulically-powered, self-advancing steel roof supports has contributed to trouble-free, more efficient mining. (43608)
Mechanization of longwall mining in coal seam with soft floor strata
Sloping about 7°, between 1.25 and 1.46 m thick coal seam is mined at depth of 500 to 600 m; steel props, pressed by overlaying coal seam strata into soft floor, could not support weak roof; switch to hydraulically-powered, self-advancing steel roof supports has contributed to trouble-free, more efficient mining. (43608)
Mechanization of longwall mining in coal seam with soft floor strata
Die Mechanisierung der Ausbauarbeit in einem Floez mit weichem Liegenden
Thorndike, A. (author)
Glueckauf ; 105
1969
9 pages
Article (Journal)
German
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