Method for breaking rock by directing high velocity jet into pre

Details Method for breaking rock by directing high velocity jet into pre Method for breaking rock by directing high velocity jet into pre

1976-08-31

1978-08-01

Purser, Ernest R.

Mining or in situ disintegration of hard material

Processes

Breaking down by direct contact with fluid

175 67, E21C 3712

Patent

active

041039718

ABSTRACT:
A hard compact material such as rock is broken by directing a high velocity jet of relatively incompressible fluid, such as water, into a hole which is drilled in the material to be broken. The jet is generated by a nozzle in alignment with the hole and is suddenly arrested in the hole in appropriate position with respect to adjacent free surfaces of the material. A jet stagnation pressure is created in the hole of sufficient magnitude and duration or jet repetion rate to break the material towards the free surfaces. Preferably, a secondary nozzle emits fluid for filling partially or wholly the hole prior to generating the high velocity jet by a primary nozzle.

REFERENCES:
patent: 3231031 (1966-01-01), Cleary
patent: 3572839 (1971-03-01), Okabe
patent: 3988037 (1976-10-01), Denisart et al.

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