Modelling Time-lapse S-wave Velocity Changes in an Unsaturated River Dyke Due to Water Infiltration

Conference Paper (2017)
Author(s)

Atsushi Suzaki (OYO Corporation, TU Delft - Applied Geophysics and Petrophysics)

R Ghose (TU Delft - Applied Geophysics and Petrophysics)

Shohei Minato (TU Delft - Applied Geophysics and Petrophysics)

Research Group
Applied Geophysics and Petrophysics
Copyright
© 2017 A. Suzaki, R. Ghose, S. Minato
DOI related publication
https://doi.org/10.3997/2214-4609.201702071
More Info
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Publication Year
2017
Language
English
Copyright
© 2017 A. Suzaki, R. Ghose, S. Minato
Research Group
Applied Geophysics and Petrophysics
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Abstract

Understanding the effect of saturation is important in assessing the failure mechanism on the land-side of a river-dyke due to rising water level in a river after heavy rainfall. S-wave velocity is controlled by soil suction and degree of saturation. Therefore, there is a possibility to estimate the unsaturated soil properties from the temporal changes in S-wave velocity. For this purpose, we model the temporal changes in S-wave velocity due to seepage of water in a dyke under rainfall. We propose a new approach for interpolating/extrapolating experimental data, in order to obtain shear modulus as a function of suction and confining stress. The seepage analysis of a river dyke under heavy rainfall shows that the temporal change in the S-wave velocity is determined more by the shear modulus than by the density. Furthermore, the S-wave velocity at shallow depths is more sensitive to seepage than the S-wave velocity at greater depths. These, together with the fact that a simple relationship exists between the shear modulus, suction and saturation, lead us to the new possibility of predicting shear modulus as a function of suction from the time-lapse S-wave velocity monitoring.

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