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Static Stress-Deformation Characteristics of Sand

Ko, Hon-Yim (1966) Static Stress-Deformation Characteristics of Sand. California Institute of Technology , Pasadena, CA. (Unpublished) http://resolver.caltech.edu/CaltechAUTHORS:20151207-165436158

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Abstract

A soil test box, capable of applying any combination of principal stresses to a cubical soil sample, was developed for the experimental investigation of the behavior of granular soils under static loading. A stress control device was also developed, enabling a continuous and proportionate change to be made in the stresses along a stress path and considerably simplifying the calculation of the stress state in the sample. The apparatus was used to investigate (a) the hydrostatic compression of an Ottawa sand, and (b) the behavior of the same soil under various deviatoric stress paths in both loading and unloading conditions. A theoretical "holey" model was postulated for sand under hydrostatic stress and the results of the analysis of this model were found to correlate closely with the experimental data. The qualitative behavior of sand under shear stresses was examined from a particulate point of view. Specially designed tests were performed on the Ottawa sand with loading and unloading along stress paths which involved different combinations of hydrostatic and deviatoric stresses, with the purpose of examining the proportions of recoverable and irrecoverable deformations. A failure envelope was obtained for a medium dense and a medium loose sand by monotonically increasing τ_(OCT) while keeping σ_(OCT) constant under various conditions of stress distribution, and it was found that the value of equivalent Coulomb φ increased from 42° in triaxial compression to 48° in triaxial extension for the medium dense sand and from 36° in triaxial compression to 44° in triaxial extension for the medium loose sand.


Item Type:Report or Paper (Technical Report)
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http://resolver.caltech.edu/CaltechETD:etd-09252002-133202Related ItemThesis
Additional Information:The author is indebted to the California Institute of Technology for the tuition scholarships granted and to the National Science Foundation for the support of this work under Contracts GP657 and GK626.
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NSFGP657
NSFGK626
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Record Number:CaltechAUTHORS:20151207-165436158
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20151207-165436158
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ID Code:62670
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Deposited By: Kristin Buxton
Deposited On:08 Dec 2015 22:56
Last Modified:08 Dec 2015 22:56

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