By A. Roberts
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Additional info for Applied Geotechnology. A Text for Students and Engineers on Rock Excavation and Related Topics
Rock Mech. Min. Sei. 3 , 8 1 - 8 8 (1966). 11. BROBERG, Κ . B . , Some aspects of the mechanism of scabbing, Int. Symp. on Stress Wave Propagation in Materials, Penn. , 1960, pp. 2 3 1 - 8 , Interscience, New York. 12. ROBERT, D . , and WELLS, Α. , The velocity of brittle fracture, Engineering 1 7 8 , 8 2 0 - 1 (1954). 13. WELLS, Α. , and POST, D . , The dynamic stress distribution surrounding a running crack: a photoelastic analysis, Engineering 1 9 2 , 7 0 5 - 2 9 (1968). 14. DOBRIN, M. , SIMON, R .
The relationship between density, detonation velocity, and detonation pressure is complex. 18 χ 1 0 " D C / ( 1 + 8 0 D ) , where Ρ is the detonation pressure (kbar), D is the specific gravity, and C is the detonation velocity (ft/s). A high detonation pressure is preferable when blasting hard, dense rock, whereas in softer rock a lower pressure may be better.
Strength is commonly expressed as a percentage, with straight nitroglycerine dynamite taken as the standard, for both the weight and the cartridge strength ratings. 4—the density of straight dynamite. The USBM nomograph by Dick  can be used to correlate the two ratings, some industrial explosives being identified by weight strength and some by cartridge strength (Fig. 10). Criteria for Selecting an Explosive Various criteria may be applied when selecting an explosive which is to be used for a rock-blasting operation.