The Modern Technique of Rock BlastingWiley, 1978 - 438 halaman |
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Halaman 233
... 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 . For 30 mm a charge of 1.0 ...
... 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 . For 30 mm a charge of 1.0 ...
Halaman 293
... distance values are halved for the same charge quantity . This will reduce the extra cost by more than half , but the risk of damage to the bridge will of course be increased . If this risk implies cracks which can be tolerated , or ...
... distance values are halved for the same charge quantity . This will reduce the extra cost by more than half , but the risk of damage to the bridge will of course be increased . If this risk implies cracks which can be tolerated , or ...
Halaman 340
... distance of 2 m ( 6.7 ft ) between the holes . Some further values are given in fig . 11 : 8 in which a curve has been drawn according to the law of conformity . It will be seen in comparison with fig . 11 : 3 that burden V1 for d = 50 ...
... distance of 2 m ( 6.7 ft ) between the holes . Some further values are given in fig . 11 : 8 in which a curve has been drawn according to the law of conformity . It will be seen in comparison with fig . 11 : 3 that burden V1 for d = 50 ...
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