The laboratory use of the spectral analysis of surface waves (SASW) for identification of underground obstacles is presented. The way in which dispersion curve is influenced by obstacles of various size, shape, rigidity and spreading depth, is presented. It is demonstrated in the study that the SASW method can successfully be used for identification of underground obstacles, for definition of the horizontal and vertical position of obstacles, and for laboratory determination of general properties of materials the obstacle is made of.
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