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Monitoring Shear-Wave Velocity Changes at a Test Dyke with Changing Water Levels
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 6th Asia Pacific Meeting on Near Surface Geoscience and Engineering, May 2024, Volume 2024, p.1 - 5
Abstract
Summary
Despite the potential benefit of high-resolution monitoring using S-wave surveys in understanding changes in water distribution in soils, it is still not fully understood if alterations in field-scale water distribution can lead to observable changes in shear-wave velocity (Vs) measurements and their mechanisms. We perform a S-wave tomography experiment to monitor changes in the water distribution in a test dyke with known geometry and composition. A key part of the experiment involves water levels systematically increased to examine the impact of water distribution on Vs structure. The results of the first-arrival tomography clearly show that a spatial change of Vs is apparent from the high-water side of the dyke as the water level is raised. Furthermore, examination of the squared Vs ratio suggests the possibility of a successful delineation of the change in the small-strain shear modulus associated with the changes in the stress condition. These findings will be crucial in developing a powerful approach to monitor in-situ stress changes using shear waves and to estimate the soil properties.
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