Examination of effective foundation drainage work against seepage failure of river embankments on highly permeable foundation ground

Most of the cases of damage caused by the seepage of river embankments occur in river embankments on a multi-layered foundation ground where a covered soil layer with low permeability exists on a very highly permeable foundation ground. In the present study, a seepage model test of a small-scale emb...

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Veröffentlicht in:Japanese Geotechnical Journal 2022/09/01, Vol.17(3), pp.433-449
Hauptverfasser: KODAKA, Takeshi, LEE, Keita, NAKAMURA, Hiroki, YAMASHITA, Junji
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Sprache:eng ; jpn
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Zusammenfassung:Most of the cases of damage caused by the seepage of river embankments occur in river embankments on a multi-layered foundation ground where a covered soil layer with low permeability exists on a very highly permeable foundation ground. In the present study, a seepage model test of a small-scale embankment was conducted focusing on the foundation drainage work, which is considered to be an effective measure against the seepage failure of the river embankment on the highly permeable foundation ground. The installation position and scale of the foundation drainage work was investigated to clarify the effect of suppressing the deformation of the embankment. Furthermore, two-dimensional unsteady seepage flow analysis was performed to clarify the distributions of local hydraulic gradient and saturation degree in the model test, and validity of the model test result was showed by conducting a safety inspection for seepage according to the actual practice. As a result, it was revealed that the setting position was important for the foundation drainage work. Also it was most effective to install the foundation drainage work at the toe of the embankment slope in terms of suppressing small-scale slip at the toe of the slope, which triggers large-scale slip failure.
ISSN:1880-6341
1880-6341
DOI:10.3208/jgs.17.433