Drilling And Grouting Support Project Cowboy

Author : James M. Polatty
Publisher :
ISBN 13 :
Total Pages : 51 pages
Book Rating : 4.:/5 (227 download)

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Download or read book Drilling and Grouting Support, Project COWBOY. written by James M. Polatty and published by . This book was released on 1961 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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. This report describes drilling and grouting operations performed by the U.S. Army Engineer Waterways Experiment Station in connection with Project COWBOY. These operations included design of (a) saltgrouts for grouting instrument and for stemming HE shot holes drilled in the salt; (b) saltcrete for filling steel plugs used to seal the cavities; (c) saltgrout for grouting in place steel liners and walkways in access tunnels to the cavities; and (d) grouts for correcting for lost circulation of drilling mud in connection with the drilling of a 36-in.-diameter ventilation shaft into the mine. The Waterways Experiment Station also tested salt cores from the mine to determine their physical properties; furnished crews and equipment for drilling and grouting 10,629 ft of vertical, horizontal, and sloping holes for various lengths and diameters, for which special tools and techniques were developed; and determined in-place ultrasonic velocities of the salt near the cavities. (Author).