The Modern Technique of Rock BlastingWiley, 1978 - 438 halaman |
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Halaman 233
... empty holes and a greatest distance ( ā ) recommended between the holes in table 8 : 1 . = It is remarkable , especially for small empty hole diameters , how much the charge must be increased with a growing distance between the centers ...
... empty holes and a greatest distance ( ā ) recommended between the holes in table 8 : 1 . = It is remarkable , especially for small empty hole diameters , how much the charge must be increased with a growing distance between the centers ...
Halaman 238
... Empty hole FIG . 8 : 7 . Probable position at 5.5 m ( 18 ft ) depth for a cut hole close to a 110 mm ( 4.4 in ) empty hole at a deviation according to table 8 : 2 . The figures indicate the probability of a hit within a corresponding ...
... Empty hole FIG . 8 : 7 . Probable position at 5.5 m ( 18 ft ) depth for a cut hole close to a 110 mm ( 4.4 in ) empty hole at a deviation according to table 8 : 2 . The figures indicate the probability of a hit within a corresponding ...
Halaman 249
... holes drilled together to one common 8 - shaped hole are used as an empty hole . Like the charged holes in the cut , the 57 mm holes are drilled with the aid of a ready - made template ( fig.8 : 11 ) . From table 8 : 4 it will be seen ...
... holes drilled together to one common 8 - shaped hole are used as an empty hole . Like the charged holes in the cut , the 57 mm holes are drilled with the aid of a ready - made template ( fig.8 : 11 ) . From table 8 : 4 it will be seen ...
Isi
Symbols used | 16 |
Calculation of the charge General part | 28 |
Calculation of the charge Practical application | 69 |
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Istilah dan frasa umum
advance per round Ammonit ammonium nitrate AN-oil angle of breakage bench blasting bench height blasting gelatine bottom charge burn cuts calculations cartridges cm/m column charge concentration of charge connection corresponding cracks cylinder cuts damage degree of packing detonators deviation diagram distance dm³ drill hole drilled depth drilling cost drilling pattern dynamite effect electric empty hole energy example faults flash-over fragmentation frequency gives greater ground vibrations ignition pattern increased indicated instantaneous interval kg/m kg/m³ Langefors-Kihlström lb/cu.ft lb/cu.yd lb/ft loading tube lower maximum burden meter multiple-row rounds Nabit Nitroglycerin Nonel number of holes obtained ordinary delay parallel hole cuts practical burden presplitting pressure reduced risk rock blasting rock factor row of holes shock wave slope smooth blasting specific charge sq.ft stoping Sweden swelling Täby throw tion tunnel underwater blasting V₁ velocity vertical weight strength width