The Modern Technique of Rock BlastingWiley, 1978 - 438 halaman |
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Halaman 288
... interval numbers which have a time distance of 3T , or more . If t = T , for example , then intervals 1 , 2 and 3 will co - operate , but not 1 and 4 or higher numbers , nor will 2 and 5 , etc. Here the condition will be 3Qred Q If the ...
... interval numbers which have a time distance of 3T , or more . If t = T , for example , then intervals 1 , 2 and 3 will co - operate , but not 1 and 4 or higher numbers , nor will 2 and 5 , etc. Here the condition will be 3Qred Q If the ...
Halaman 289
... interval time is T = 30 ms and the natural vibration time of the ground wave T≈ 10 ms , i.e. the condition τ ≥ 2.5 T , has been fulfilled . The charges in different intervals do not then co - operate and 2 kg can be blasted in every ...
... interval time is T = 30 ms and the natural vibration time of the ground wave T≈ 10 ms , i.e. the condition τ ≥ 2.5 T , has been fulfilled . The charges in different intervals do not then co - operate and 2 kg can be blasted in every ...
Halaman 415
... interval can be used as this case is more favorable then with one single interval . - 9. Take for instance the big curve for τ = 0 in fig . 9:20 and change the time scale so that the frequency is ƒ = 5 c / s and thus T = 200 ms . Show ...
... interval can be used as this case is more favorable then with one single interval . - 9. Take for instance the big curve for τ = 0 in fig . 9:20 and change the time scale so that the frequency is ƒ = 5 c / s and thus T = 200 ms . Show ...
Isi
Symbols used | 16 |
Calculation of the charge General part | 28 |
Calculation of the charge Practical application | 69 |
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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