The Modern Technique of Rock BlastingWiley, 1978 - 438 halaman |
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Halaman 197
... drilling pattern is expected to remain unchanged , it is designed for the greatest advance aimed at , say 5.1 m ( 17 ft ) , but only the inner 4.2 , 4.5 or 4.8 m ( 14 , 15 or 16 ft ) is drilled and blasted until at least 90 % of the drilled ...
... drilling pattern is expected to remain unchanged , it is designed for the greatest advance aimed at , say 5.1 m ( 17 ft ) , but only the inner 4.2 , 4.5 or 4.8 m ( 14 , 15 or 16 ft ) is drilled and blasted until at least 90 % of the drilled ...
Halaman 333
... Drilling pattern After drilling , every hole must be easily found for loading , connecting and checking . This means that the arrangement of the holes must be of the simplest geometrical pattern even if this means the drilling of ...
... Drilling pattern After drilling , every hole must be easily found for loading , connecting and checking . This means that the arrangement of the holes must be of the simplest geometrical pattern even if this means the drilling of ...
Halaman 338
... drilling pattern The idea of this is to improve the control of the round . The simpler the drilling pattern the less correction is generally required due to faulty drill- ing . The first step is to use as big a diameter as possible and ...
... drilling pattern The idea of this is to improve the control of the round . The simpler the drilling pattern the less correction is generally required due to faulty drill- ing . The first step is to use as big a diameter as possible and ...
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