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Title: Development of a vibropacker system for inducing polarized shear waves and compression waves at depths
Authors: United States. Assistant Secretary of the Army (R & D)
Ballard, Robert F.
Leach, Roy E.
Keywords: Boreholes
Compression waves
Shear waves
Vibropacker system
Shock waves
Geophysical surveys
Publisher: U.S. Army Engineer Waterways Experiment Station.
Engineer Research and Development Center (U.S.)
Description: Miscellaneous Paper
Abstract: This report describes the development of the U.S. Army Engineer Waterways Experiment Station (WES) borehole vibropacker system and a technique for applying the apparatus for generation of vertically polarized shear waves at any predetermined point within an existing borehole. Methods of receiver and transducer placement and orientation are also discussed. In addition, techniques of data acquisition and interpretation are presented along with comparisons of data from in situ surface vibrations and laboratory dynamic shear test data. When comparing shear and compression wave velocities, it was found that a good correlation exists between the three comparable test methods: the vibropacker system, surface vibrations, and laboratory testing. As a result of this feasibility study, it was determined that the vibropacker system will prove to be a useful tool for the determination of shear and compression wave velocities.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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