A. Roberts's Applied Geotechnology. A Text for Students and Engineers on PDF

By A. Roberts

ISBN-10: 0080240151

ISBN-13: 9780080240152

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FIG. 9. Trench blasting. 50 Rock Excavation by Smoot h wall Blasting—/// Blasting By drilling a series of holes at closely spaced intervals around the perimeter of the excavation, the blast may be trimmed to the finished dimensions with a minimum of overbreak. Under the ideal conditions for smoothwall blasting a pilot heading is carried in advance of the trim operations so that the rock may be broken to a free face unconstrained by broken debris. The main blast round should be so arranged that the rock is broken towards free surfaces giving throw towards the centre of the cleared crosssection.

Rock Mech. Min. Sei. 1, 2 3 1 - 5 4 (1964). 49. HAAS, C. , and RINEHART, J. , Coupling between unconfined cylindrical explosive charges and rock, Int. J. Rock. Mech. Min. Sei. 2 , 1 3 - 2 4 (1965). 50. , The influence of borehole diameter on the rock blasting capacity of an expended explosive charge, Int. J. Rock Mech. Min. Sei. 6 , 2 7 7 - 8 4 (1969). 51. MELNIKOV, Ν . V . , Influence of charge design on the results of blasting, Int. Symp. , Univ. of Missouri, Rolla, 1961, pp. 147-55, Pergamon, New York, 1962.

Blasting caps may be non-electrical, in which case they are initiated by an igniter, fuse, or detonating cord, or they may be electrical, initiated by a hot bridge-wire. They may be instantaneous in operation or they may incorporate time delays, in intervals usually ranging from 5 to 35 ms. Blasting agents such as the À N - F O mixtures and the water-gel explosives are not selfinitiating, so that the charge needs to be initiated by a primer, which is detonated by conventional means. The primer may be a small charge of commercial dynamite but it may also be one of a number of proprietary non-nitroglycerine compounds which include sensitizing agents.

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Applied Geotechnology. A Text for Students and Engineers on Rock Excavation and Related Topics by A. Roberts


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