Applied Geotechnology. A Text for Students and Engineers on - download pdf or read online

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By A. Roberts

ISBN-10: 0080240151

ISBN-13: 9780080240152

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The Blasting Action of Cardox and Compressed-air Discharges The blasting action of the explosive substitutes is substantially one of gas expansion. Any body stress waves are likely to be of little significance, although the surface Rayleigh waves can be of an order comparable with those produced by some chemical explosives [8]. The initial jet of gas or liquid impacts upon the sides of the borehole and penetrates into the confining medium to a depth determined by the initial velocity and the mass flow.

Effects of Stemming the Charge Stemming is used to confine the explosion gases and thus increase the amplitude of the peak explosion pressure. Johnsson and Hofmeister [52] describe comparative blasts in rock salt with variations in stemming. A charge of 300 g of explosive stemmed with sand or granular salt produced the same effect as 400 g of unstemmed charge (Fig. 19). The limit 760 700 680 660 • Geometry I (sand) Friction force = O O O I P 640 620 600 Sand / WaterV Zone 175 , χ Geometry I I (sand-concrete) Friction force =0001 Ρ 10 J_ 15 Time (s) FIG.

The Principles of Rock Blasting, E. & F. N . Spon, London, 1909. 30. CLARK, L . D . , and SALUGA, S . , Blasting mechanics, Trans. AIME New York 2 3 2 , 7 8 - 9 0 (1964). 31. LEET, L . , Vibrations from Blasting Rock, Harvard Univ. Press, 1960. 32. RICKETTS, T. , Dynamic properties of rocks and composite structural materials, Int. J. Rock Mech. Min. Sei. 7 , 3 1 5 - 5 5 (1970). 33. NICHOLLS, H. , and HOOKER, V. , Comparative Studies of Explosives in Salt, US Bur. Min. Rep. Invest. N o . 6041, 1962.

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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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