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Experimentelle Bestimmung der Nichtlinearität von Spannungsgrenzbedingungen im Bereich geringer Spannungen [Experimental determination of the non-linearity of failure criteria in the low stress rnage]
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|Alternate Title:||Experimental determination of the non-linearity of failure criteria in the low stress rnage|
|Authors:||Bergholz, Katharina; Herle, Ivo|
|Author Affiliations:||Primary: |
Bundesanstalt für Wasserbau, Abteilung Geotechnik, Karlsruhe, Germany
Technische Universität Dresden, Germany
|Volume Title:||Geotechnik (Essen)|
|Source:||Geotechnik (Essen), 40(2), p.119-125. Publisher: Ernst & Sohn, a Wiley Brand (for Deutsche Gesellschaft für Geotechnik), Berlin, Germany. ISSN: 0172-6145|
|Note:||In German. 8 refs.|
|Summary:||Experimental determination of the non-linearity of failure criteria in the low stress range. Earlier research has shown that the Mohr-Coulomb shear parameters φ' und c' are no material constants but state dependent parameters. Consequently, the failure criterion of overconsolidated soils exhibits non-linearity, particularly under low confinement stresses, in the shape of a more or less pronounced curvature of the envelope towards the origin. With the help of experimental investigations, the evolution of the effective shear parameters as a function of mean stress and preconsolidation stress has been analysed. Soil samples of silty clay were preloaded to different overconsolidation ratios and stresses and sheared along unconventional stress paths in order to explore the low stress range, which is difficult to investigate by conventional triaxial compression tests. The experimental series has proven that especially the soil's maximum load influences the degree of non-linearity of the failure criterion: the higher the preconsolidation pressure, the more intense the curvature. The overconsolidation ratio on the other hand has a stronger impact on the stiffness of the soil, indirectly indicating a link between the volumetric response and the stress path followed. Abstract Copyright (2017), Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.|
|Subjects:||Bearing capacity; Experimental studies; Foundations; Laboratory studies; Nonlinear materials; Nonlinear processes; Overconsolidated materials; Quantitative analysis; Shear stress; Soil mechanics; Strain; Triaxial tests|
|Copyright Information:||GeoRef, Copyright 2021 American Geosciences Institute. Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe, Hanover, Germany|
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