Yielding and Stress-Strain Behaviour of Sand

Belkheir, Khaled (1993) Yielding and Stress-Strain Behaviour of Sand. MSc(R) thesis, University of Glasgow.

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The object of this work has been to gain an understanding of sand behaviour when subjected to a change of stress. The testing procedure involved development of a pluviation method of sample preparation and a saturation method using the initial vacuum technique. Experimental testing has been carried out in a Bishop and Wesley triaxial cell. The tests involved conventional drained triaxial tests and stress probes around an anisotropic stress state on saturated Lochaline sand. A group of shear box tests were used merely to compare the angles of frictions that have been obtained both in the triaxial tests and shear box tests and also to test the available stress dilatancy relationships e.g Taylor (1948). The first type of tests was used to derive some of the ingredients of incremental plasticity theory (flow rules etc..) and elastic parameters. The second type of tests was used to see the relationship between different constant stress increment ratios and strain increment ratios, in other words the study of the dependency of the strain increment ratio on stress path. The effect of stress state on strain increment ratio was also studied. A model has been developed based on the concept of double hardening which uses two mechanisms of yielding, a shear yielding and a volumetric yielding. This model uses a new flow rule for shear yielding that is able to take into account the stress level and initial density dependency of the resulting stress strain relationships. This model gives very good predictions and simulates most of the features observed in the triaxial compression. It is also able to determine the incremental response and the yielding properties of sand when subjected to probings in different directions.

Item Type: Thesis (MSc(R))
Qualification Level: Masters
Additional Information: Adviser: David Wood Meir
Keywords: Civil engineering, Geological engineering
Date of Award: 1993
Depositing User: Enlighten Team
Unique ID: glathesis:1993-75366
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 19 Nov 2019 20:24
Last Modified: 19 Nov 2019 20:24
URI: http://theses.gla.ac.uk/id/eprint/75366

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