Smooth wall blasting in rock

Details Smooth wall blasting in rock Smooth wall blasting in rock

1987-02-27

1987-09-01

Nelson, Peter A.

Ammunition and explosives

Blasting

Patterned blasting

102313, 299 13, 175 451, F42D 300

Patent

active

046900586

ABSTRACT:
A method of smooth wall rock blasting is provided in which an alignment of boreholes for explosive charging is drilled into rock and a single, smaller diameter empty borehole is drilled close and parallel to, and on each side of each charged borehole. Upon detonation of the charged boreholes, the rock is cracked smoothly along the plane coincident with the axes of the holes. The method reduces drilling costs to a minimum and provides improved results over the previous pre-shearing and other known methods.

REFERENCES:
patent: 3582138 (1971-06-01), Loofbourow
patent: 3877373 (1975-04-01), Bergmann et al.
patent: 3902422 (1975-09-01), Coursen
patent: 4040329 (1977-08-01), Ljungberg
patent: 4290649 (1981-09-01), Ricketts
patent: 4326752 (1982-04-01), Ricketts
patent: 4333684 (1982-06-01), Ricketts et al.
patent: 4434654 (1984-03-01), Hulsing, II et al.
patent: 4550786 (1985-11-01), Rosenstock
Mining Engineering, Novel Void-Hole Process May Improve in Situ Fragmentation, Mar., 1979, p. 269.

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