The Modern Technique of Rock BlastingWiley, 1978 - 438 halaman |
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Halaman 242
... means that the practial mean advance can be lower if there is flash - over or difficulty in effecting complete ejection of the debris through the drilled opening . At hole depths up to 4-5 m ( 13-17 ft ) and possibly also for greater ...
... means that the practial mean advance can be lower if there is flash - over or difficulty in effecting complete ejection of the debris through the drilled opening . At hole depths up to 4-5 m ( 13-17 ft ) and possibly also for greater ...
Halaman 255
... mean advance and the calculated value . The values calculated ( Hcal ) are taken from table 8 : 4 , or for the burn ... means that the distances have been about 20 % more for the four closest holes than those recommended in tables 8 : 1 ...
... mean advance and the calculated value . The values calculated ( Hcal ) are taken from table 8 : 4 , or for the burn ... means that the distances have been about 20 % more for the four closest holes than those recommended in tables 8 : 1 ...
Halaman 353
... means the same effect with an air - bubble curtain , as the pressure is then already reduced before it reaches the curtain . When this reduction is obtained experience has hitherto indi- cated that if there is still a risk of damage ...
... means the same effect with an air - bubble curtain , as the pressure is then already reduced before it reaches the curtain . When this reduction is obtained experience has hitherto indi- cated that if there is still a risk of damage ...
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