DRILLING AND GROUTING SUPPORT. FINAL REPORT, PROJECT COWBOY

Technical Report · Wed Mar 01 04:00:00 EST 1961

OSTI ID:4839855

Polatty, J M; Goode, T B; Bendinelli, R A; Houston, B J

In Project COWBOY, conducted to develop information on ground motion caused by underground explosions, high explosive (HE) charges were fired in two large spherical cavities, 12 and 30 ft in diameter, excavated in a salt mine, and the resulting ground motion was compared with that obtained when similar yield tamped HE charges were fired in the same general vicinity. The ground motion was measured by instruments embedded in the immediate and general area. Drilling and grouting operations performed by the U. S. Army Engineer Waterways Experiment Station in connection with Project COWBOY are described. These operations included design of saltgrouts for grouting instrument and for stemming HE shot holes drilled in the salt; saltcrete for filling steel plugs used to seal the cavities; saltgrout for grouting in place steel liners and walkways in access tunnels to the cavities; and grouts for correcting for lost circulation of drilling mud in connection with the drilling of a 36-in.-diameter ventilation shaft into the mine. Salt cores from the mine were also tested to determine their physical properties. Crews and equipment were furnished for drilling and grouting 10,629 ft of vertical, horizontal, and sloping holes of various lengths and diameters, for which special tools and techniques were developed. In-place ultrasonic velocities of the salt near the cavities were determined. (auth)

• Research Organization: Waterways Experiment Station, Vicksburg, Miss.
• NSA Number: NSA-15-017886
• OSTI ID: 4839855
• Report Number(s): TID-12709
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

EARTH
GENERAL AND MISCELLANEOUS
MEASURED VALUES
MOTION
PROJECT COWBOY
SODIUM CHLORIDES
SPHERES
ULTRASONICS
UNDERGROUND EXPLOSIONS
VELOCITY
WELL LOGGING
ZONES