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Author(s):	Schwarz, Viktoria; Vrettos, Christos
Title:
Abstract:	Die vorliegende Veröffentlichung behandelt die Entwicklung eines elasto-plastischen Stoffmodells für teilgesättigte bindige Böden. Abweichend von den aus der Literatur bekannten Stoffmodellen für teilgesättigte Böden sind Änderungen von Zustandsgrößen unmittelbar in den Modellparametern erfassbar und nicht mit der Saugspannung gekoppelt. Der Einfluss der Zustandsgrößen Anfangsporenzahl, -sättigungsgrad sowie Spannungsniveau auf das mechanische Verhalten eines mittel bis ausgeprägt plastischen Tons wird untersucht. Zur Ermittlung der relevanten Stoffparameter werden triaxiale deviatorische Kompressions- und Extensionsversuche in einem speziellen Triaxialgerät durchgeführt. Das aufgestellte Stoffmodell wird in das FEM-Programmsystem Abaqus implementiert und damit das Verformungsverhalten einer Flachgründung bei Aufsättigung des Bodens untersucht. Mechanical behaviour of a partially saturated kaolinite-clay: Experimental investigation, constitutive model, and implementation. The present publication deals with the development of an elasto-plastic constitutive model for partially saturated cohesive soils. In contrast to the constitutive models available in the literature for unsaturated soils, changes in the state variables are explicitly included in the model parameters and uncoupled to the suction value. The influence of the state parameters initial void ratio, initial degree of saturation, and stress level on the mechanical behaviour of a common medium to high plasticity clay is investigated. The relevant constitutive parameters are determined from triaxial deviatoric compression and extension tests carried out in a custom-built triaxial apparatus. The constitutive model is implemented in the FEM code Abaqus, and applied to investigate the deformation of a surface foundation during saturation due to irrigation.
Source:	geotechnik 35 (2012), No. 4
Page/s:	236-244
Language of Publication:	German

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