Research Article
Dec 1976
Method for Crosshole Seismic Testing
Publication: Journal of the Geotechnical Engineering Division
Volume 102, Issue 12
Abstract
Many foundation dynamics and soil-structure interaction problems require in-situ values of shear wave velocities and elastic moduli, or both, for foundation materials. The project engineer has at his disposal several methods for determining these properties in situ. Each of the methods has a particular attribute, but the crosshole survey when conducted properly, lends itself best to signal enhancement techniques and appears most versatile. Development of a nondestructive vertically polarized repeatable shear wave source is presented. Techniques of data acquisition using signal enhancement are considered. Comparison with shear wave velocity data obtained by other methods leads to the conclusion that a vertically polarized shear wave train can be generated and positively identified due to almost total absence of P-wave components. The method for crosshole seismic testing presented will largely free the project engineer from misinterpretation of shear wave velocity data.
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Information
Published In
Journal of the Geotechnical Engineering Division
Volume 102 • Issue 12 • December 1976
Pages: 1261 - 1273
Copyright
© 1976 American Society of Civil Engineers.
History
Published in print: Dec 1976
Published online: Feb 11, 2021
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Authors
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Robert F. Ballard Jr.
Research Geophysicist, Chf.; Geodynamics Branch, Earthquake Engrg. and Vibration Div., Soils and Pavements Lab., U.S. Army Engr. Waterways Experiment Station, Vicksburg, Miss
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