Print Email Facebook Twitter Modelling Time-lapse S-wave Velocity Changes in an Unsaturated River Dyke Due to Water Infiltration Title Modelling Time-lapse S-wave Velocity Changes in an Unsaturated River Dyke Due to Water Infiltration Author Suzaki, A. (TU Delft Applied Geophysics and Petrophysics; OYO Corporation) Ghose, R. (TU Delft Applied Geophysics and Petrophysics) Minato, S. (TU Delft Applied Geophysics and Petrophysics) Date 2017 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. To reference this document use: http://resolver.tudelft.nl/uuid:85de0041-e52c-4da6-8fff-1720e5f31fb7 DOI https://doi.org/10.3997/2214-4609.201702071 Publisher EAGE Embargo date 2018-04-01 Source Near Surface Geoscience Conference & Exhibition 2017: Malmo, Sweden Event Near Surface Geoscience Conference & Exhibition 2017, 2017-09-03 → 2017-09-07, Clarion Hotel & Congress Malmö Live, Malmo, Sweden Part of collection Institutional Repository Document type conference paper Rights © 2017 A. Suzaki, R. Ghose, S. Minato Files PDF NSG17_Abstract_A_Suzaki.pdf 709.28 KB Close viewer /islandora/object/uuid:85de0041-e52c-4da6-8fff-1720e5f31fb7/datastream/OBJ/view