The Modern Technique of Rock BlastingWiley, 1978 - 438 halaman |
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Halaman 278
... damage , a condition has been low frequencies f < fo . For high f values other condi- tions , which lead to S ( 1,1 ) apply . There remains uncertainty only in the vicinity of fto . Thus we have to consider the damage criteria S ( 2 , 1 ...
... damage , a condition has been low frequencies f < fo . For high f values other condi- tions , which lead to S ( 1,1 ) apply . There remains uncertainty only in the vicinity of fto . Thus we have to consider the damage criteria S ( 2 , 1 ...
Halaman 279
... damage factor for these frequencies is not proportional to the acceleration but to the relative vibration velocity . This conclusion is strongly supported by later experience . The risk of damage is characterized in table 9 : 1 . In the ...
... damage factor for these frequencies is not proportional to the acceleration but to the relative vibration velocity . This conclusion is strongly supported by later experience . The risk of damage is characterized in table 9 : 1 . In the ...
Halaman 280
... damage , the vibration velocities given in table 9 : 1 should be expected to be about lower in sand - clay and till for the damage indicated . We get the value v = 50 mm / s ( 2 in / s ) for " no noticeable cracks " . Reports from ...
... damage , the vibration velocities given in table 9 : 1 should be expected to be about lower in sand - clay and till for the damage indicated . We get the value v = 50 mm / s ( 2 in / s ) for " no noticeable cracks " . Reports from ...
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