Evaluation of Wave Propagation Parameters and Attenuation Characteristics of Homogeneous Cohesionless Soil Media: Fid-Bau Portal

Evaluation of Wave Propagation Parameters and Attenuation Characteristics of Homogeneous Cohesionless Soil Media

Vinoth, B. / Ghosh, Ambarish

A detailed laboratory model study has been carried out to determine wave propagation parameters and attenuation characteristics of homogeneous cohesionless soil media by using shallow surface wave generated due to impact load. Surface waves have been generated due to impact load for varied impact energy levels (4–20 Nm), and motion of soil particles has been measured by using seismic accelerometers on surface of the soil medium for different radial distances (0.4–1.6 m). A simplified analysis procedure has been performed by using correlation of spectral signal of different radial distances to determine wave propagation parameters like Rayleigh wave velocity ( $V_{R}$ \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$V_{{\text{R}}}$$\end{document}, $m / s)$ \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\text{m}}/{\text{s}})$$\end{document} and Rayleigh wavelength ( $λ_{R}, m$ \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\lambda_{{\text{R}}} ,{\text{m}}$$\end{document}) and also develop experimental dispersion curve form the different receiver spacing $(Δ x, m)$ \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\left( {{\Delta }x,{\text{m}}} \right)$$\end{document}. The attenuation properties of soil like geometric attenuation $(γ)$ \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\left( \gamma \right)$$\end{document} and material attenuation $(α, m^{- 1})$ \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\left( {\alpha ,{\text{m}}^{ - 1} } \right)$$\end{document} have been evaluated from the characteristics of spectral signal in frequency domain. Finally, the obtained values from the laboratory model test have been compared with the published research work.