Directed-thrust blasting process

Details Directed-thrust blasting process Directed-thrust blasting process

F - Mech Eng,Light,Heat,Weapons

42

D

102/10

F42D 1/00 (2006.01) E21D 9/00 (2006.01)

Patent

CA 1047834

APPLICATION FOR LETTERS PATENT By: David Linn Coursen Title for Invention Directed-Thrust, Blasting Process Abstract of the Disclosure 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°C 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. -1-

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