The Modern Technique of Rock BlastingWiley, 1978 - 438 halaman |
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Halaman 19
... surfaces they will give rise to tensile stresses which may cause scabbing of a part of the rock near the surface . The mechanism of such reflections has been studied thoroughly by Fischer , Broberg , Pettersson , Rhinehart , Duvall ...
... surfaces they will give rise to tensile stresses which may cause scabbing of a part of the rock near the surface . The mechanism of such reflections has been studied thoroughly by Fischer , Broberg , Pettersson , Rhinehart , Duvall ...
Halaman 21
... surface moves forward , the pressure is unloaded and the tension increases in the primary cracks which incline obliquely forward . If the burden is not too great , several of these cracks expand to the exposed surface and complete ...
... surface moves forward , the pressure is unloaded and the tension increases in the primary cracks which incline obliquely forward . If the burden is not too great , several of these cracks expand to the exposed surface and complete ...
Halaman 98
... surface of a block of granite . The explosive is smeared on the rough surface of the slot . The length of the tube is 8 cm ( 3 in ) , the amplitude 12 cm ( 4.8 in ) , the frequency 2 p / s and the maximum speed 3.5 m / s ( 10.5 ft / sec ) ...
... surface of a block of granite . The explosive is smeared on the rough surface of the slot . The length of the tube is 8 cm ( 3 in ) , the amplitude 12 cm ( 4.8 in ) , the frequency 2 p / s and the maximum speed 3.5 m / s ( 10.5 ft / sec ) ...
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