Determination of the heterogeneity of a dense sand specimen and its evolution in triaxial compression
Publikation: Beitrag in Buch/Konferenzbericht/Sammelband/Gutachten › Beitrag in Konferenzband › Beigetragen › Begutachtung
Beitragende
Abstract
Standard laboratory tests, such as the triaxial test, are commonly considered to be element tests. With the help of x-ray CT, numerous studies have analysed the grain kinematics and the evolution of the soil fabric inside specimens in triaxial compression. It has been found that the specimen is highly heterogeneous from the beginning of the test and therefore cannot be treated as one single representative elementary volume (REV). Instead, the specimen consists of multiple smaller homogeneous regions. With the help of the REV, the specimen heterogeneity and its evolution can be characterised so that it can be considered in the constitutive modelling of the soil. In this study, the size of the REV is determined for a Hostun sand specimen in triaxial compression regarding not only the void ratio but also two contact fabric descriptors – the coordination number and the scalar anisotropy factor. The REVs are then used to study the heterogeneity of the soil specimen in different loading states. All of the variables localise during the triaxial test but only the contact fabric shows early signs of localisation. Furthermore, the influence of the grid size on the distribution of the variables is analysed as well as the evolution of specific specimen regions. While there is much smaller change below the shear band, the soil above and inside the shear band, respectively, behaves oppositely.
Details
Originalsprache | Englisch |
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Titel | Proceedings of the 28th European Young Geotechnical Engineers Conference (EYGEC2024) |
Publikationsstatus | Veröffentlicht - 2024 |
Peer-Review-Status | Ja |
Externe IDs
ORCID | /0000-0002-9222-3361/work/177360205 |
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ORCID | /0000-0002-7279-0385/work/177360543 |