Fine-grained organic dredged materials for dike cover layers
Material characterisation and experimental results
Autor: Cantré, S.; Große, A.-K.; Neumann, R.; Nitschke, E.; Henneberg, M.; Saathoff, F.
In:

Proceedings WODCON XX World Dredging Congress and Exibition
3-7 June 2013, Brussels, Belgium
Herausgeber: WODA
Ort: Delft
Verlag: WODA
ISBN: 978-90-809883-0-9
Seite: 1 - 14
Jahr: 2013

Einordung:
Institut: Professur Geotechnik und Küstenwasserbau

Abstract:
In the South Baltic cooperation project DredgDikes different dredged materials are investigated to be
used in dike construction. Depending on the type of dredged material combinations with different geosynthetic
solutions and composites from dredged materials and ashes are tested. The investigations are mainly performed
in Rostock and Gdansk. In Rostock, focus is given to uncontaminated fine-grained organic dredged materials
from the Warnow river delta, dewatered and ripened on the Hanseatic City of Rostock’s containment areas.
Therefore a considerable geotechnical and chemical laboratory programme has been performed for material
characterisation and a large-scale experimental dike has been built. The dike with a height of 3.30 m consists of
ten different cross-sections with three different dredged materials, different geosynthetics solutions, and varying
slope inclination. Since the dredged materials possess high natural water contents even after the ripening
process, they tend to considerable shrinkage, which is why geosynthetic reinforcement has been placed in parts
of the dike cover layers to reduce cracking. Also geosynthetic erosion control products have been installed at
parts of the surface to reinforce the roots of the turf and thus to strengthen the whole construction with respect to
surface erosion. The construction can be filled with water for seepage investigations and some sections are
prepared for overflowing experiments to test crest and landside slope with respect to erosion stability.
Additional laboratory tests have been performed of which an overflowing test is presented in more detail. Both
on the dike and on especially prepared testing plots the turf development on different dredged material surfaces
and in different weather conditions has been investigated. The first results have been summarised here. Apart
from general problems on the construction site in the very wet summer of 2011, the installation of the dredged
material in the experimental dike was unproblematic. Different compaction approaches have been examined and
the results are presented here.

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