Directed-thrust blasting process

Details Directed-thrust blasting process Directed-thrust blasting process

1974-09-24

1976-08-10

Pendegrass, Verlin R.

Ammunition and explosives

Igniting devices and systems

299 13, F42D 300

Patent

active

039734978

ABSTRACT:
Directed thrusts are generated in rock by detonating explosive charges in groups of drill holes therein, the drill holes being aligned so that the maximum thrust from the substantially simultaneous detonation of charges in a group of holes is exerted in a direction close to one in which the rock has been found to be particularly vulnerable to failure, i.e., a direction that is at an angle of 60.degree. to a representative normal of a densely populated set of joints in the rock and that also is close to a direction of maximum principal tectonic stress should one be found.

REFERENCES:
patent: 60572 (1866-12-01), Shaffner
patent: 2772632 (1956-12-01), Aitchison et al.
patent: 3024727 (1962-03-01), Hradel
patent: 3466094 (1969-09-01), Haworth et al.
patent: 3792906 (1974-02-01), Kuck
patent: 3863987 (1975-02-01), Lampard

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