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    Item type:Publication, Access status: without files ,
    Hypoplastic model with intergranular strain: dependence on grain properties and initial state
    (2020-12)
    Nagula, Sparsha Sinduri
    ;
    Grabe, Jürgen
    The Hypoplastic model is introduced and the procedure to determine the model parameters along with intergranular strain parameters is discussed in detail. Static trial tests and load/displacement controlled oedometer tests are performed to determine the hypoplastic model parameters. The dependence of the hypoplastic model parameters on initial density of granular materials is studied. Intergranular strain parameters are conventionally determined by resonant column tests. An innovative method based on static triaxial setup coupled with stress path test method is employed to determine the intergranular strain parameters. Parameters are determined for 5 different naturally existing sands. The dependence of the model parameters, on density, stress state and grain assembly properties of the sand is studied. The elastic strain range within which the incremental stiffness remains constant after strain reversal is studied in conjunction with the grain properties and the validity of the assumption that the governing parameter is a material independent constant is commented upon. The model parameters are verified against results of standard element tests.
    Publicationtype: Journal Article
      162
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    Item type:Publication, Access status: without files ,
    Advances in numerical modelling of different ground improvement techniques
    (2017-09)
    Heins, Evelyn
    ;
    Seitz, Karlotta-Franziska
    ;
    Chmelnizkij, Alexander
    ;
    Milatz, Marius
    ;
    Grabe, Jürgen
    Common ground improvement techniques like deep vibration compaction, vibro replacement stone columns, dynamic compaction or vibratory rolling are still a subject of research. Research fields are for example optimized layouts or estimation of main influencing parameters. A lot of successful scientific research is conducted on piles and piling using various numerical methods. Therefore, it is assumed that numerical models can be used to improve ground improvement methods. In this contribution, different ground improvement techniques and numerical models to simulate the influence of these techniques on the surrounding soil are presented. Furthermore, optimization methods and potentials of ground improvement techniques are shown.
    Publicationtype: Journal Article
      182