Abstract
AbstractNon-destructive testing (NDT) plays an important role in material inspection and characterization. In geotechnical engineering, the popular seismic NDT includes Spectral Analysis of Surface Wave (SASW), Multichannel Analysis of Surface Waves Method (MASW) and Continuous Surface Wave (CSW). A forward solver and a back-calculation algorithm are required to determine the soil stratigraphy and the properties of each soil layer. However, most of available forward solvers are limited to elastodynamic solutions in which the soil’s porous nature and water content and can’t be taken into consideration. In this paper, a poro-elastodynamic forward solver for seismic NDT is presented. The proposed solver provides an analytical solution for wave propagation in saturated soil media using the spectral element method. The P and S waves are decoupled through the Helmholtz decomposition. The P waves in solid skeleton and porewater are further decoupled through an Eigen decomposition technique. Such a solver can effectively determine the dispersion relation for a given structure, which can be further used for geophysical inversion application based on surface wave tests.KeywordsPoro-elastodymanicWave propagationDispersion curvesMoisture content
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