Micromechanical analysis of the cyclic mechanical response of granular materials through DEM simulations

  • In this study, we investigate with the Discrete Element Method (DEM) the mechanical behavior of a cohesionless granular material under undrained true triaxial conditions, considering both monotonic and cyclic loading. We link the microstructure evolution within the granular assembly to its macroscopic cyclic response. To capture the mechanical response of our reference material (Karlsruhe fine sand), a rolling resistance linear contact model along with spherical particles is calibrated through a trial-and-error process, adjusting the model parameters to capture the experimentally observed behavior as close as possible. A series of cyclic undrained triaxial tests were simulated to investigate the micromechanical processes underlying liquefaction of sand under cyclic shearing. We analyzed the evolution of various fabric indices, including the redundancy index, contact normal orientations, and fabric anisotropy in relation to the pre- and post-liquefaction responses. The results reveal that a redundancy index below unity provides aIn this study, we investigate with the Discrete Element Method (DEM) the mechanical behavior of a cohesionless granular material under undrained true triaxial conditions, considering both monotonic and cyclic loading. We link the microstructure evolution within the granular assembly to its macroscopic cyclic response. To capture the mechanical response of our reference material (Karlsruhe fine sand), a rolling resistance linear contact model along with spherical particles is calibrated through a trial-and-error process, adjusting the model parameters to capture the experimentally observed behavior as close as possible. A series of cyclic undrained triaxial tests were simulated to investigate the micromechanical processes underlying liquefaction of sand under cyclic shearing. We analyzed the evolution of various fabric indices, including the redundancy index, contact normal orientations, and fabric anisotropy in relation to the pre- and post-liquefaction responses. The results reveal that a redundancy index below unity provides a unified criterion for the loss of the isostatic condition within the granular assembly, which triggers the onset of liquefaction. Throughout the cyclic loading process, sliding-dominant contact-yielding mechanisms remain prevalent. Additionally, significant changes in contact normal orientation and increasing fabric anisotropy dependent on the induced axial strain occur as the sample undergoes post-liquefaction deformation.zeige mehrzeige weniger

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Metadaten
Verfasserangaben:M. Victoria Molina, Roberto Cudmani, Andrés Alfonso Peña-OlarteORCiDGND
DOI:https://doi.org/10.1051/epjconf/202534007020
Titel des übergeordneten Werkes (Englisch):Powders & Grains 2025
Verlag:EDP Sciences
Verlagsort:Frankreich
Herausgeber*in:Meheboob Alam, Sovan Lal Das, Manaswita Bose, Tejas Murthy, Vijayakumar Chikkadi, Anugrah Singh, Stefan Luding
Dokumentart:Konferenzveröffentlichung
Sprache:Englisch
Jahr der Erstveröffentlichung:2025
Veröffentlichende Institution:Fachhochschule Potsdam
Datum der Freischaltung:08.12.2025
GND-Schlagwort:Diskrete-Elemente-Methode; Geotechnik
Aufsatznummer:07020
Seitenzahl:4
Fachbereiche und Zentrale Einrichtungen:FB3 Bauingenieurwesen
DDC-Klassifikation:600 Technik, Medizin, angewandte Wissenschaften / 620 Ingenieurwissenschaften
Open Access:Hybrid Open Access
Lizenz (Deutsch):Creative Commons - CC BY - Namensnennung 4.0 International
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