Method and apparatus for controlled small-charge blasting of har

Details Method and apparatus for controlled small-charge blasting of har Method and apparatus for controlled small-charge blasting of har

1996-08-02

2000-03-14

Nelson, Peter A.

Ammunition and explosives

Blasting

Borehole loading

102312, 102333, 175 458, 175 46, F42B 300, E21B 700

Patent

active

060357843

ABSTRACT:
Rock and other hard materials, such as concrete, are fragmented by a controlled small-charge blasting process. A cartridge containing an explosive charge is inserted at the bottom of a hole drilled in the rock. The explosive charge is configured to provide the desired pressure in the hole bottom, including, if desired, a strong shock spike at the hole bottom to enhance microfracturing. The cartridge is held in place or stemmed by a massive stemming bar of high-strength material such as steel which blocks the flow of gas up the drill hole except for a small leak path between the stemming bar and the drill hole walls. The cartridge-incorporates additional internal volume designed to control the application of pressure in the bottom hole volume by the detonating explosive.

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