The Modern Technique of Rock BlastingWiley, 1978 - 438 halaman |
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Halaman 309
... smooth contours , or when it is a question of following a curved contour exactly one or two uncharged guide holes between the charged ones may be used . The spacing is then reduced to one half or one third of the value . If drilled in ...
... smooth contours , or when it is a question of following a curved contour exactly one or two uncharged guide holes between the charged ones may be used . The spacing is then reduced to one half or one third of the value . If drilled in ...
Halaman 310
U. Langefors, Björn Kihlström. TABLE 10 : 1 . Smooth blasting and presplit blasting . Drill hole diameter d Concentration of charge 1 Smooth blasting Presplitting E1 E1 V1 mm ( in ) kg / m ( lb / ft ) Charge units m m ( ft ) 30 ( 11 ) ...
U. Langefors, Björn Kihlström. TABLE 10 : 1 . Smooth blasting and presplit blasting . Drill hole diameter d Concentration of charge 1 Smooth blasting Presplitting E1 E1 V1 mm ( in ) kg / m ( lb / ft ) Charge units m m ( ft ) 30 ( 11 ) ...
Halaman 320
... smooth blasting row in an open cut where the diameter d = 50 mm ( 2 in ) is used . 2. Calculate the charge and discuss how to arrange the loading and to ignite the holes in problem 1. ( Bottom charge has to be calculated according to ...
... smooth blasting row in an open cut where the diameter d = 50 mm ( 2 in ) is used . 2. Calculate the charge and discuss how to arrange the loading and to ignite the holes in problem 1. ( Bottom charge has to be calculated according to ...
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