Holography—A New Tool for Soil Dynamics

by Richard D. Woods, (M.ASCE), Assoc. Prof.; Univ. of Michigan, Ann Arbor, MI,
Norman E. Barnett, Assoc. Prof.; Univ. of Michigan, Ann Arbor, MI,
Rolf Sagesser, (A.M.ASCE), Basler and Hofmann, Zurich, Switzerland,

Serial Information: Journal of the Geotechnical Engineering Division, 1974, Vol. 100, Issue 11, Pg. 1231-1247

Document Type: Journal Paper

Abstract: Holographic interferometry was used to find dynamic displacement of the surface of a sand half-space model excited by a harmonically vibrating circular footing. The screening effectiveness of wave barriers composed of rows of vertical cylindrical holes was studied using this technique. The general results indicate that: (1) holographic interferometry is a powerful tool for measurement of static as well as dynamic displacement of the surface of sand half-space model; and (2) stroboscopic double exposure, holographic interferometry can be used to get stopped motion records of traveling waves. Specific results for barriers indicate that the scaled hole diameter (diameter/wave-length of Rayleigh wave) should be at least 1/6, the net scaled spacing [(c-c spacing - diameter)/wavelength] should be less than 1/4, and the solid-filled hole barriers behave fundamentally differently than fluid-filled or void holes.

Subject Headings: Soil dynamics | Displacement (mechanics) | Surface waves | Half space | Dynamic models | Terrain models | Wave measurement | Rayleigh waves |

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