The Modern Technique of Rock BlastingWiley, 1978 - 438 halaman |
Dari dalam buku
Hasil 1-3 dari 64
Halaman 16
... ( ft ) mm ( in ) g B width of a tunnel or of a bench round c velocity of sound in a material c rock factor , c 。 for limit charge , c approximation kg / m3 ( lb / cu.yd ) d diameter of drill - bit m m / s ( ft / s ) mm ( in ) D height of ...
... ( ft ) mm ( in ) g B width of a tunnel or of a bench round c velocity of sound in a material c rock factor , c 。 for limit charge , c approximation kg / m3 ( lb / cu.yd ) d diameter of drill - bit m m / s ( ft / s ) mm ( in ) D height of ...
Halaman 60
... lb / ft ) . Continue to the line for rock factor c = 0.4 and turn down to the right - hand horizontal scale for the maximum burden . The value V = 1.42 m ( 4.7 ft ) is obtained . Example 2 : 1b . Assumptions : Bench height K = 10 m ( 33 ft ) ...
... lb / ft ) . Continue to the line for rock factor c = 0.4 and turn down to the right - hand horizontal scale for the maximum burden . The value V = 1.42 m ( 4.7 ft ) is obtained . Example 2 : 1b . Assumptions : Bench height K = 10 m ( 33 ft ) ...
Halaman 84
... ft ) E = 1.9 m ( 6.3 ft ) VE = 2.8 m2 ( 32 sq.ft ) = 1.1 kg / m ( 0.73 lb / ft ) = 0.44 kg / m ( 0.73 lb / ft ) V1 E1 = = - 1.2 m ( 4 ft ) = 1.5 m ( 5 ft ) V1E1 = 1.8 m2 ( 20 sq.ft ) 1 Height of the bottom по = 2.0 m ( 6.7 ft ) charge hp - ...
... ft ) E = 1.9 m ( 6.3 ft ) VE = 2.8 m2 ( 32 sq.ft ) = 1.1 kg / m ( 0.73 lb / ft ) = 0.44 kg / m ( 0.73 lb / ft ) V1 E1 = = - 1.2 m ( 4 ft ) = 1.5 m ( 5 ft ) V1E1 = 1.8 m2 ( 20 sq.ft ) 1 Height of the bottom по = 2.0 m ( 6.7 ft ) charge hp - ...
Isi
Symbols used | 16 |
Calculation of the charge General part | 28 |
Calculation of the charge Practical application | 69 |
Hak Cipta | |
14 bagian lainnya tidak diperlihatkan
Edisi yang lain - Lihat semua
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