The Modern Technique of Rock BlastingWiley, 1978 - 438 halaman |
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Halaman 183
... deviations then an approximation R ~ Ra gives values that are only 20 % lower than the proper ones . Ordinarily the resulting deviation is only known within a tolerance of ± 20 % and the approximation may be quite satisfactory . The ...
... deviations then an approximation R ~ Ra gives values that are only 20 % lower than the proper ones . Ordinarily the resulting deviation is only known within a tolerance of ± 20 % and the approximation may be quite satisfactory . The ...
Halaman 185
... Deviation FIG . 7 : 4 . Number of holes in percent with less deviation than that read on the horisontal scales A - C ( N - distribution ) . A = very careful drilling 05/6 = 1 cm / m , B with 05/6 = 2 cm / m , C = good drilling σ5 / 6 ...
... Deviation FIG . 7 : 4 . Number of holes in percent with less deviation than that read on the horisontal scales A - C ( N - distribution ) . A = very careful drilling 05/6 = 1 cm / m , B with 05/6 = 2 cm / m , C = good drilling σ5 / 6 ...
Halaman 229
... deviation is 5 cm / m . 2. Determine the burden to be used with H = 5.4 m , d = 50 mm and deviation 10 cm / m . 3. At what distance from a rectangular opening with width B = 0.4 m could a hole be placed in the drilling pattern when the ...
... deviation is 5 cm / m . 2. Determine the burden to be used with H = 5.4 m , d = 50 mm and deviation 10 cm / m . 3. At what distance from a rectangular opening with width B = 0.4 m could a hole be placed in the drilling pattern when the ...
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