Loss with Time of Dredged Sea Sand in Tidal Embankment Subject to Sea Level Variation

초록

In this study, loss with time of dredged sea sand in a tidal embankment subject to sea level variation was examined through the centrifugal model test. The experimental results demonstrate that a differential subsidence occurs on the surface of the dredged-sea-sand fill and that the largest subsidence was observed just above the damaged portion of the geosynthetic mat. In addition, image analysis provided the largest displacement vector at the damaged portion of the geosynthetic mat, the shear-strain localization from the damaged portion of the geosynthetic mat through the center of the slope surface, and the crest of the dredge-sea sand fill. These displacement vectors and shear strains occurred early in the experiment and increased over time. Therefore, the loss of dredged sea sand can occur rapidly with damage to the geosynthetic mat and can possibly induce differential subsidence and cracks at the surface of the dredged-sea sand fill.

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