Detection of underground obstacles by SASW method - Numerical aspects

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The ability of the spectral analysis of surface waves (SASW) test to detect underground obstacles has been investigated. The SASW test is simulated by the finite-element method. The fluctuations in the dispersion curve, due to Rayleigh waves reflected from an obstacle, are used to detect the obstacle. Both rigid obstacles and cavities with a variety of shapes and embedment depths are considered. Obstacles in a homogeneous half-space, a layered half-space, and a pavement profile are detected. Finite-element results are compared to the available experimental results and verified by a simple mathematical model. The results indicate that the SASW test can detect an underground obstacle effectively, provided that the obstacle is relatively close to the surface. A scheme to use the surface waves for obstacle detection (SWOD) has been proposed.

Original languageEnglish (US)
Pages (from-to)212-219
Number of pages8
JournalJournal of Geotechnical Engineering
Issue number3
StatePublished - Mar 1997

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Environmental Science(all)


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