Experimental evaluation and extension of a simple critical state model for sand |
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Authors: | H S Yu C D Khong J Wang G Zhang |
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Affiliation: | (1) Nottingham Centre for Geomechanics, School of Civil Engineering, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK |
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Abstract: | This paper presents an experimental evaluation of a simple critical state model and its extension in modelling the stress-strain
behaviour of sand under a wide range of confining pressures and initial void ratios under both drained and undrained loading
conditions. The critical state model concerned is known as CASM developed by Yu 1,2] and CASM is a relatively simple model
as it only requires seven model constants, five of which are the same as those used in the modified Cam clay model. All these
constants have clear physical meanings and can be easily determined from the results of triaxial tests as demonstrated in
this paper. A key advantage of CASM over many other existing critical state models lies on its unified nature as it can be
used to model the behaviour of both clay and sand. In addition, the paper also shows how CASM can be further extended in order
to simulate a particular undrained behaviour of loose sand, which is the reappearance of hardening after the material experiences
a peak shear stress followed by a softening response. |
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Keywords: | Critical state model Triaxial tests Plasticity sand State parameter Experimental evaluation |
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