Abstract
Geotextile, sand filled bags (geobags) are successfully being used to protect riverbanks against repeated erosion attacks. Large scale physical hydraulic model tests have been used to shed light on the incipient motion of the flexible geobags and enabled the review of the design methodology for sizing geobags against current loading. This study finds that the filling percentage has a large influence on the stability of the geobags, and consequently they should have a degree of filling of at least 80%. Additionally, this study found that the stability formula used for geobags should use the thickness as the characteristic diameter rather than the cube root of the volume.
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