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Rock Mechanics and Rapid Excavation Using Explosives
Final technical rept. 4 Feb 1972-24 Mar 1973
AAI CORP BALTIMORE MD WEAPONS AND AERO SYSTEMS DIV
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An exploratory program was conducted to prove the feasibility of a high rate, explosive drilling system to significantly increase the rate of rock excavation and disintegration. Basically, the system utilizes a unique multi- jet explosive capsule, incorporating 7 GRP shaped charge liners with a common explosive charge and detonator. The capsules are transported automatically at a high rate down the drill tube by the use of water and high pressure air, between the capsules. The capsules are ejected from the tube, travel through the water in a filled borehole and is detonated against the working face at the bottom of the borehole. The ultimate system will incorporate an automatic and continuous capsule feed to obtain the high rate of fire in excess of 600 SPM and will recycle the water. Each capsule produces 7 jet penetrations into the rock.
APPROVED FOR PUBLIC RELEASE