HOLOGRAPHY--A NEW TOOL FOR SOIL DYNAMICS

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. /ASCE/

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  • Accession Number: 00080524
  • Record Type: Publication
  • Report/Paper Numbers: Proc. Paper 10949
  • Files: TRIS
  • Created Date: Feb 27 1975 12:00AM