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    Item type:Publication, Access status: with files ,
    Zum Versagen von Unterwasserböschungen im Seegang
    (2022)
    Bubel, Julian
    ;
    Grabe, Jürgen
    The analysis of the influence of relative density, soil saturation and sea state parameters on the stability of sub-aqueous slopes in sandy soils narrows down the range of the relevant parameters. Liquefaction failure of underwater slopes can occur in loose granular soils at dimensionless load amplitudes p* > 0.05. Medium dense or dense soils do not fail under the considered boundary conditions.
    Publicationtype: Doctoral Thesis
      311  178
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    Item type:Publication, Access status: with files ,
    The influence of the drainage regime on the installation and the response to vertical cyclic loading of suction caissons
    (2021-02-07)
    Stapelfeldt, Marc
    ;
    Grabe, Jürgen
    Offshore wind turbines supported by suction caisson jackets transfer loads to the foundation through a vertical push-pull mechanism. This leads to the foundation performance under vertical cyclic loading to be a critical design aspect. Design methods are limited and only provide rough estimates. The current paucity of data of suction caisson in-service performance in uniform sand and layered soil under loading conditions relevant to offshore wind turbines calls for physical evidence to be gathered. This is addressed through numerical analyses and centrifuge tests, which investigate the suction installation and the caisson response to vertical cyclic loading. The results show no evidence of an effect of the suction caisson installation on the in-service performance. The response to vertical cyclic loading is determined by the drainage regime and the interplay between tension and compression.
    Publicationtype: Doctoral Thesis
      423  305