Effects of soil nonhomogeneity on SASW testing

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Abstract

In SASW testing, soil profiles are assumed to consist of homogeneous horizontal layers. This assumption is violated in presence of nonhomogeneities. The effects of soil non-homogeneities on the SASW test profile definition are investigated herein by a finite element method simulation of the test. The nonhomogeneities analyzed include layer dipping, presence of soil lenses, and presence of underground obstacles and cavities. Layer dipping causes frequency shifting between the dispersion curves for up and downslope directions. Underground obstacles cause fluctuations of the dispersion curve. The fluctuations are the strongest for a receiver pair with a short spacing and placed close to the front of the obstacle. For a receiver pair placed symmetrically about the obstacle, rigid obstacles cause generally an increase in the phase velocity of the dispersion curve, while cavities cause a decrease in the phase velocity. Backcalculation based on such dispersion curves and the assumption of homogeneous and uniform thickness layers can lead to large errors in the profile definition. Procedures for detection and quantitative evaluation of dipping layers and underground obstacles are suggested.

Original languageEnglish (US)
Pages (from-to)1083-1097
Number of pages15
JournalGeotechnical Special Publication
Issue number58 /2
StatePublished - Jan 1 1996
EventProceedings of the 1996 Conference on Uncertainty in the Geologic Environment, UNCERTAINTY'96. Part 2 (of 2) - Madison, WI, USA
Duration: Jul 31 1996Aug 3 1996

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All Science Journal Classification (ASJC) codes

  • Soil Science
  • Building and Construction
  • Architecture

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