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Subsidence and roof movement incident to the extraction of coal
So far as roof action at face is concerned, longwall as usually practiced falls within two method classifications; first, that of subsiding immediate roof without major breaks on pack walls built of ripped material or on back filling; second, that of caving immediate roof, caved material filling voids and acting in some respects like back filling.
Subsidence and roof movement incident to the extraction of coal
So far as roof action at face is concerned, longwall as usually practiced falls within two method classifications; first, that of subsiding immediate roof without major breaks on pack walls built of ripped material or on back filling; second, that of caving immediate roof, caved material filling voids and acting in some respects like back filling.
Subsidence and roof movement incident to the extraction of coal
Coal Mine Mgmt
Claghorn, C.R. (author)
1928
3 pages
Article (Journal)
English
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