Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Calibration of a hydromechanical discrete-continuum model and liquefaction analysis of a staurated soil system
December 2024 ; School of Engineering ; This dissertation presents a calibration of a hydromechanical discrete-continuum model of granular media. The approach emphasizes the critical role of particle-scale characteristics, such as size, shape, and surface texture, in influencing the macroscopic behavior of a granular system. While challenges exist in quantifying these micro-level properties, basing model calibration on such parameters demonstrably yields realistic system responses across diverse loading conditions. This approach facilitates the development of complex and robust numerical models that are easy-to-calibrate. The research highlights the significant influence of shape parameters, like sphericity and roundness, on the shear behavior of granular materials. Traditional contact models, like the Hertz-Mindlin model, can sometimes fall short due to their assumption of perfectly spherical contact surfaces. This limitation is addressed through the implementation of of general models like the J\"{a}ger model, which account for local variations in particle angularity. This allows for a more accurate representation of a wider range of particle conditions. Once calibrated, the model is then employed in constant volume simple shear tests, demonstrating an ability to reproduce liquefaction curves that closely match experimental data. This performance surpasses the accuracy achieved with models employing spherical particles and conventional contact models. Furthermore, the calibrated model is utilized to simulate a sheet pile supporting a dry soil backfill under dynamic loading. The resulting simulations produce realistic outcomes, that accurately capture the results obtained experimentally in centrifuge tests, including lateral displacement and settlement of the backfill soil and rotation of the retaining wall. Finally, this dissertation presents an integration of the discrete model of the particles with an average Navier Stokes model of the pore fluid, resulting in a coupled CFD-DEM model for a saturated ...
Calibration of a hydromechanical discrete-continuum model and liquefaction analysis of a staurated soil system
December 2024 ; School of Engineering ; This dissertation presents a calibration of a hydromechanical discrete-continuum model of granular media. The approach emphasizes the critical role of particle-scale characteristics, such as size, shape, and surface texture, in influencing the macroscopic behavior of a granular system. While challenges exist in quantifying these micro-level properties, basing model calibration on such parameters demonstrably yields realistic system responses across diverse loading conditions. This approach facilitates the development of complex and robust numerical models that are easy-to-calibrate. The research highlights the significant influence of shape parameters, like sphericity and roundness, on the shear behavior of granular materials. Traditional contact models, like the Hertz-Mindlin model, can sometimes fall short due to their assumption of perfectly spherical contact surfaces. This limitation is addressed through the implementation of of general models like the J\"{a}ger model, which account for local variations in particle angularity. This allows for a more accurate representation of a wider range of particle conditions. Once calibrated, the model is then employed in constant volume simple shear tests, demonstrating an ability to reproduce liquefaction curves that closely match experimental data. This performance surpasses the accuracy achieved with models employing spherical particles and conventional contact models. Furthermore, the calibrated model is utilized to simulate a sheet pile supporting a dry soil backfill under dynamic loading. The resulting simulations produce realistic outcomes, that accurately capture the results obtained experimentally in centrifuge tests, including lateral displacement and settlement of the backfill soil and rotation of the retaining wall. Finally, this dissertation presents an integration of the discrete model of the particles with an average Navier Stokes model of the pore fluid, resulting in a coupled CFD-DEM model for a saturated ...
Calibration of a hydromechanical discrete-continuum model and liquefaction analysis of a staurated soil system
Rashique, Utsa (Autor:in) / Zeghal, Mourad / Abdoun, Tarek / Uchida, Shun / El Ghoraiby, Mohamed
01.12.2024
Hochschulschrift
Elektronische Ressource
Englisch , Unbekannt
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