Roof-control blasting method for soft and fractured roof ore body recovery

The invention discloses a roof-control blasting method for soft and fractured roof ore body recovery. A control blasting technology is adopted to break ores under a blasting layer through millisecond blasting; and an ore roof supporting layer is reserved, so that safety of a stope roof is maintained...

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Main Authors LIU FUCHUN, DUAN JINCHAO, GAN HUAIYING
Format Patent
LanguageChinese
English
Published 31.05.2017
Subjects
AMMUNITION
BLASTING
EARTH DRILLING
FIXED CONSTRUCTIONS
HEATING
LIGHTING
MECHANICAL ENGINEERING
MINING
MINING OR QUARRYING
WEAPONS
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Abstract The invention discloses a roof-control blasting method for soft and fractured roof ore body recovery. A control blasting technology is adopted to break ores under a blasting layer through millisecond blasting; and an ore roof supporting layer is reserved, so that safety of a stope roof is maintained. The method adopts a short-hole drilling mode to form control blast holes and main blast holes, the control blast holes are formed in a control blast line, and the main blast holes are vertically arranged perpendicular to a rock drilling working surface; and millisecond detonators are adopted, the main blast holes are blast row by row along a free surface, and the control blast holes are finally blast once to downwards press ores. The roof-control blasting method is suitable for ore body recovery which has an obvious ore body boundary, an unstable roof, firm and stable ores, and needs keeping ores to support the roof, effectively keeps ores to support the roof, and prevents stope ore loss caused by roof collapse,
AbstractList The invention discloses a roof-control blasting method for soft and fractured roof ore body recovery. A control blasting technology is adopted to break ores under a blasting layer through millisecond blasting; and an ore roof supporting layer is reserved, so that safety of a stope roof is maintained. The method adopts a short-hole drilling mode to form control blast holes and main blast holes, the control blast holes are formed in a control blast line, and the main blast holes are vertically arranged perpendicular to a rock drilling working surface; and millisecond detonators are adopted, the main blast holes are blast row by row along a free surface, and the control blast holes are finally blast once to downwards press ores. The roof-control blasting method is suitable for ore body recovery which has an obvious ore body boundary, an unstable roof, firm and stable ores, and needs keeping ores to support the roof, effectively keeps ores to support the roof, and prevents stope ore loss caused by roof collapse,
Author LIU FUCHUN
GAN HUAIYING
DUAN JINCHAO
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Snippet The invention discloses a roof-control blasting method for soft and fractured roof ore body recovery. A control blasting technology is adopted to break ores...
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SubjectTerms AMMUNITION
BLASTING
EARTH DRILLING
FIXED CONSTRUCTIONS
HEATING
LIGHTING
MECHANICAL ENGINEERING
MINING
MINING OR QUARRYING
WEAPONS
Title Roof-control blasting method for soft and fractured roof ore body recovery
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