The Modern Technique of Rock BlastingWiley, 1978 - 438 halaman |
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Halaman 132
... lower , despite the very low costs for the explosive . It should be emphasized , that even if alternative I has been included here because this case has often been used as a reference , it is not appro- priate for use as a starting ...
... lower , despite the very low costs for the explosive . It should be emphasized , that even if alternative I has been included here because this case has often been used as a reference , it is not appro- priate for use as a starting ...
Halaman 133
... lower drilling costs this minimum shifts from alternative E to D , but the difference in costs between these alternatives is naturally insignificant , as one is in both cases evidently in the vicinity of the minimum where the curves are ...
... lower drilling costs this minimum shifts from alternative E to D , but the difference in costs between these alternatives is naturally insignificant , as one is in both cases evidently in the vicinity of the minimum where the curves are ...
Halaman 200
... lower than 8 m ( 25 ft ) are usually blasted in full section . For greater heights and long tunnels the lower part of the section can be left for benching with short delay multiple - row blasting . The unloading of the rock in the bench ...
... lower than 8 m ( 25 ft ) are usually blasted in full section . For greater heights and long tunnels the lower part of the section can be left for benching with short delay multiple - row blasting . The unloading of the rock in the bench ...
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