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Abstract
The genetic algorithm (GA) has been employed to perform the inversion considering the predominant modal curve in the dispersion image using the MASW technique. Using the stiffness matrix method (SMM) for a given layered medium, the predominant modal curve was generated by imposing the criterion of the maximum vertical displacement at the free surface. The current study involves the MASW based (i) synthetic experiments on four different geologic profiles using the finite elements (FE) analysis, and (ii) in-situ tests on five different sites. From the FE based MASW dispersion images, it is revealed that the modal plot in the dispersion image matches closely with the corresponding theoretically generated predominant modal curve which is obtained using the SMM. For the experimental data, the inverted geological profiles, derived from the observed predominant dispersion plot and with the usage of the SMM, were subsequently used for performing the wave propagation simulation using the FE analysis. The simulated dispersion images using the FE analysis showed a great match with the corresponding observed experimental images. It is found that the current predominant mode based GA inversion approach is more accurate as compared to the fundamental/multiple modes based inversion method.
Published Version
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