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    Item type:Publication, Access status: without files ,
    Sustainable dike adaptation measures using finite element method and optimization algorithm NSGA-II
    (Springer, 2024-07-11)
    Cerek, Kacper
    ;
    Hadjiloo, Elnaz
    ;
    Grabe, Jürgen
    Given the context of climate change, it is imperative to adapt the majority of existing flood defence systems using sustainable methods. Multi-objective evolutionary algorithms, like NSGA-II, offer a valuable decision support tool for exploring different designs based on predefined objectives. This paper specifically examines the application of the NSGA-II optimization algorithm in geotechnical problems by integrating it with FEM simulations, where slope horizontal runs are considered as variables. Throughout the study, different sets of termination criteria are employed to optimize the reduction of structural exploitation and the expected CO2 footprint.
    Publicationtype: Conference Paper
      32
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    Comparison of reconstituted normally consolidated Kaolinite and Illite in CIU triaxial tests showcasing the influence of pore fluid’s salinity
    (Springer, 2024-07-11)
    Schröder, Maximilian
    ;
    Grabe, Jürgen
    CIU triaxial tests are conducted on very pure kaolinite and illite clay powders using two different pore fluids to study differences in shear parameters. First, the two materials are characterized in-depth. Special attention was paid to sample preparation in order to generate high-quality samples. The evaluation of the test data reveals an increase in friction angle for both materials when using a 1M KCl solution as compared to demineralized water. Kaolinite shows a lower friction angle for the same pore fluid than illite. Future work will further investigate different salt concentrations and different salt types.
    Publicationtype: Conference Paper
      14
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    Numerical investigation of drag embedment anchor model reduction for FOWTs in coarse and fine-grained Baltic Sea soil
    (Springer, 2024-07-11)
    Dao, Duy Anh
    ;
    Dicke, Konrad
    Floating offshore wind turbines (FOWTs) enable renewable energy generation in deep ocean locations and provide economic and ecological benefits. However, reliable anchoring remains challenging due to a limited understanding of seabed-anchor interactions. This study examines the extent to which drag embedment anchor (DEA) models can be simplified without impacting penetration depth results in CEL simulations. Five DEA models with varying complexity were tested in typical Baltic Sea soils, sand and clay, modeled within a hypoplastic and visco-hypoplastic framework. Results suggest that the most simplified model is sufficient for sand. However, precaution should be taken when altering the anchor model in a clay environment due to the nonlinear relationship between model complexity and performance. This study offers insights into optimizing model complexity and computational efficiency in DEA simulations, ultimately improving safety and effectiveness for floating anchor installations.
    Publicationtype: Conference Paper
      20
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    Numerical shear band strengthening with contact modelling for the increase of load capacity of geotechnical structures
    (Springer, 2024-07-11)
    Hadjiloo, Elnaz
    ;
    Grabe, Jürgen
    Geotechnical constructions often fail due to a localized shear failure. Shear zones are formed in the soil as a result of external loads. To increase the load bearing capacity of geotechnical constructions and to prevent a critical failure mechanism, it is possible to only strengthen the potential shear bands by injecting cement in the beginning of the potential shear bands. This local strengthening makes it possible to increase the load bearing capacity of constructions with a minimum use of material. The soil strengthening is numerically modelled for a strip foundation using FEM and implementing different strengthening criteria within a hypoplastic soil model which considers material transition from sand to strengthened soil. The necessity of realistic contact modelling is shown, and the results both with and without contact modelling are shown. The numerical results show a significant increase in the load bearing capacity compared to the results without shear band strengthening.
    Publicationtype: Conference Paper
      11