Accession Number : AD0756350

Title :   Project BUCKBOARD, Grouting Support,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS

Personal Author(s) : Bendinelli,Ralph A.

Report Date : APR 1961

Pagination or Media Count : 11

Abstract : In Project BUCKBOARD, high-explosive charges were detonated in basalt to determine their earth-moving ability in this type of formation. One shot (shot 12), a 40,000-lb charge of spherically shaped TNT placed 43 ft below ground surface in an 11-ft-diameter cavity at the bottom of a 4-ft-diameter drilled hole, was to be used for ground-motion studies. The Waterways Experiment Station determined pertinent physical properties of the basalt and developed a grout mixture with matching properties for use in grouting earth-motion measuring instruments into eight holes drilled near shot 12; grouted the instrument holes; and from specimens of the field-mixed grout determined its physical properties at shot time. The grout required a high water content to be pumpable; consequently its compressive strength and ultrasonic pulse velocity were less than desired. (Author)

Descriptors :   (*INSTRUMENTATION, *GROUT), (*NUCLEAR EXPLOSIONS, BASALT), SIMULATION, MIXTURES, AGING(MATERIALS), CRATERING, NUCLEAR INDUSTRIAL APPLICATIONS

Subject Categories : Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE