Method for explosive breaking of hard compact material

Details Method for explosive breaking of hard compact material Method for explosive breaking of hard compact material

1976-09-07

1978-05-09

Purser, Ernest R.

Mining or in situ disintegration of hard material

Processes

Explosive

102 23, 175 35, E21C 3712, F42D 304

Patent

active

040883680

ABSTRACT:
A hard compact material, such as rock, is broken by delivering an explosive into at least one hole which has been pre-drilled in the material to be broken and by forcing a relatively incompressible fluid, such as water, into the hole to impact the explosive to initiate same. Upon detonation of the explosive the fluid stems the hole thereby delaying leakage of blasting gases out of the hole before the material is broken. Preferably, the explosive and the fluid are launched together into the hole. In this case may the explosive and the fluid be encapsulated in a common cover.

REFERENCES:
patent: 3002454 (1961-10-01), Chesnut
patent: 3877373 (1975-04-01), Bergmann et al.

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