The Modern Technique of Rock BlastingWiley, 1978 - 438 halaman |
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Halaman 242
... depth ( H ) in meters for various burn cuts at a relative advance of 90 % . Туре Fig 8:13 30-35 mm Grönlund " Cat ... depth of the holes be increased to 3.6 m , and if desired in the next step beyond that value if the drilling precision ...
... depth ( H ) in meters for various burn cuts at a relative advance of 90 % . Туре Fig 8:13 30-35 mm Grönlund " Cat ... depth of the holes be increased to 3.6 m , and if desired in the next step beyond that value if the drilling precision ...
Halaman 413
... depth 0.5 B = 3.0 m ( 10 ft ) . With a double spiral cut 2.95-6.0 m ( 10-20 ft ) can be obtained when drill- ing to a depth of H = 3.1-6.3 m ( 10.3–21 ft ) depending on the size of the empty hole Ø 2 · 57-200 mm ( 2 · 2.5–8 in ) . See ...
... depth 0.5 B = 3.0 m ( 10 ft ) . With a double spiral cut 2.95-6.0 m ( 10-20 ft ) can be obtained when drill- ing to a depth of H = 3.1-6.3 m ( 10.3–21 ft ) depending on the size of the empty hole Ø 2 · 57-200 mm ( 2 · 2.5–8 in ) . See ...
Halaman 414
... depth H = 4.5 m . At this depth o 8 . = = 2.64 cm / m and the drilling devia- - tion are the same at the bottom as for a cut with σ = 2.0 cm / m and drilled 32 % deeper to H = 5.95 m . This will give a mean advance 86 % of the drilled depth ...
... depth H = 4.5 m . At this depth o 8 . = = 2.64 cm / m and the drilling devia- - tion are the same at the bottom as for a cut with σ = 2.0 cm / m and drilled 32 % deeper to H = 5.95 m . This will give a mean advance 86 % of the drilled depth ...
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