| 摘要 |
The invention of the present application provides a method of controlled blasting comprising dispersing an explosive within a blasthole to form a dispersed explosive having a lower average bulk density than said explosive prior to dispersion and detonating said dispersed explosive. Typically the explosive is dispersed in air, however the explosive may be dispersed in other matrices such as other gases or liquids or in gases comprising particulate matter. The explosive may be dispersed using a number of different techniques such as, using a discharge of pressurised fluid or by detonation of a small propellant charge or by falling under gravity in the blasthole. The invention of the present application is particularly useful where a reduced concentration of explosive energy is required such as in perimeter control, presplitting or soft rock conditions, can be controlled by a method which involves dispersing the explosives composition within a blasthole prior to initiating the blast. The dispersion of the explosive composition within a blasthole provides an in situ low density explosives composition.
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