Detection of Underground Obstacles by SASW Method—Numerical Aspects
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 123, Issue 3
Abstract
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.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 123 • Issue 3 • March 1997
Pages: 212 - 219
Copyright
Copyright © 1997 American Society of Civil Engineers.
History
Published online: Mar 1, 1997
Published in print: Mar 1997
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