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    Item type:Publication, Access status: with files ,
    Bearing capacity of tension steel piles in thinly inter-layered soils: numerical Class-A prediction vs. field measurements
    (Wiley, 2026-02-25)
    Alkateeb, Diaa
    ;
    Grabe, Jürgen
    This study investigates the bearing capacity of tension piles and pile-soil interaction during loading. Discrepancies between predicted and measured bearing capacities in previous tests motivated the study, where analytical methods showed considerable scatter and uncertainties in design. A large-scale field test was conducted on three additional adjacent tension piles (Pile 1, 2 and 3), featuring extensive fibre-optic strain measurements. Concurrently, a numerical Class-A prediction was developed beforehand to analyse pile-soil interaction and predict bearing capacity, utilising hypoplastic and visco-hypoplastic models for the thinly inter-layered subsoils. The fibre-optic measurements revealed significant locked-in bending strains post-installation, prior to loading. The results showed a correlation between pronounced bending strains and lower load-bearing capacity. Numerical predictions were compared with the field measurements, providing good agreement with Pile 1, which exhibited minimal installation-induced bending and thus represented an idealised case. This comparison offered valuable insights into tension pile failure mechanisms and load capacity. This research enhances understanding of tension pile behaviour in complex soils and underscores the necessity of optimising installation methods to improve load-bearing capacities.
    Publicationtype: Journal Article
      30  21
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    Item type:Publication, Access status: with files ,
    The influence of the void fraction on the particle migration: a coupled computational fluid dynamics–discrete element method study about drag force correlations
    (Wiley, 2021)
    Kanitz, Manuela
    ;
    Grabe, Jürgen
    Granular soils subjected to flow through their soil skeleton can show a behaviour in which fine particles migrate through the pore space between coarser particles. This process is called internal instability or suffusion. This contribution deals with the numerical analysis of the migration of fine particles in a soil column subjected to fluid flow with unresolved coupled computational fluid dynamics–discrete element method (CFD–DEM) with special regards to the used drag force correlation. The contribution investigates the influence of the Schiller–Naumann model and its extension with a voidage term on the migration behaviour of fine particles. The voidage term is further varied with a parameter, which controls the impact of the change of the void fraction on the drag force. It could be observed that the Schiller–Naumann model does not yield in a suffusive behaviour while the extended models show significant particle migration. Thereby, increasing the impact of the void fraction on the drag force results in stronger particle migration. These results reveal the need for good validation techniques. They indicate how the drag force correlation can be adapted to depict the correct particle migration behaviour.
    Publicationtype: Journal Article
    Scopus© Citations 19  176  1022