The Penetration of Rock by High-speed Water Jets
نویسندگان
چکیده
The effect of pressure, stand-off distance and time on the penetration of sandstones by a 0.84 mm. jet of water was investigated. Pressures ranged up to 9000 lb/in 2 (62 MN/M), stand-off distances to 2 in. (5.08 cm) and time from 0.5 to 30 sec. The effect of using a friction reducing agent was determined. The advantages of allowing the spent jet to escape and not interfere with penetration are demonstrated by both interrupting the jet and by rotating the target rock. Very short time intervals of jet operation were also investigated, and rapid penetration rates obtained. The importance of free access of the jet to the target is emphasized by an experiment with an angled jet and rotating target operating as a type of drill.
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