STRAIN LOCALIZATION IN SOLID CYLINDRICAL CLAY SPECIMENS USING DIGITAL IMAGE ANALYSIS (DIA) TECHNIQUE

The strain non-uniformity due to the end restraint for a deforming specimen during triaxial testing of clay specimens was minimized in this study using lubricated end platens. This research presents the evidence of the occurrence of strain localization due to shear banding within the clay specimen by using DIA (Digital Image Analysis) technique. The variation in strain localization patterns of soil specimen is also studied for evaluating the influence of confining stress, loading conditions, stress history, drainage conditions, and soil's microfabric (geometric arrangement of clay platelets) by performing a series of lubricated-end triaxial tests on solid cylindrical specimens of Kaolin clay. This paper presents a comparative study based on the observed orientation of shear band formation, and the intensity of strain localization (by estimating the maximum local strain) within the specimen during its shear deformation process.

[1]  D. Penumadu,et al.  Strain Localization in Combined Axial-Torsional Testing on Kaolin Clay , 2006 .

[2]  M. Jirásek.  Objective modeling of strain localization , 2002 .

[3]  L. Szabó.  Comments on loss of strong ellipticity in elastoplasticity , 2000 .

[4]  Laing Barden,et al.  Use of Free Ends in Triaxial Testing of Clays , 1965 .

[5]  Ronaldo I. Borja,et al.  Capturing strain localization behind a geosynthetic‐reinforced soil wall , 2003 .

[6]  J. Rice.  Localization of plastic deformation , 1976 .

[7]  Gioacchino Viggiani,et al.  Shear bands in plane strain compression of loose sand , 1997 .

[8]  Davide Bigoni,et al.  Uniqueness and localization—I. Associative and non-associative elastoplasticity , 1991 .

[9]  Ioannis Vardoulakis,et al.  Shear band inclination and shear modulus of sand in biaxial tests , 1980 .

[10]  E. Macari,et al.  MEASUREMENT OF VOLUME CHANGES IN TRIAXIAL TESTS USING DIGITAL IMAGING TECHNIQUES , 1997 .

[11]  P. Lade.  Analysis and prediction of shear banding under 3D conditions in granular materials , 2003 .

[12]  Jean-Lou Chameau,et al.  Strain-rate effects in pressuremeter testing using a cuboidal shear device: experiments and modeling , 1998 .

[13]  Dayakar Penumadu,et al.  Effect of Microfabric on Shear Behavior of Kaolin Clay , 2007 .

[14]  Jacques Desrues,et al.  Localization of the deformation in tests on sand sample , 1985 .

[15]  APPLICATION OF MICROMECHANICS MODEL TO STUDY ANISOTROPY OF SOILS AT SMALL STRAINS , 2002 .

[16]  Poul V. Lade,et al.  ANALYSIS OF SHEAR BANDING IN TRUE TRIAXIAL TESTS ON SAND , 2001 .

[17]  John F. Peters,et al.  Shear Band Formation in Triaxial and Plane Strain Tests , 1988 .

[18]  J. Rice,et al.  A note on some features of the theory of localization of deformation , 1980 .

[19]  R. Hill.  Acceleration waves in solids , 1962 .

[20]  Kohji Tokimatsu,et al.  Simplified procedures for the evaluation of settlements in sands due to earthquake shaking , 1987 .

[21]  J. Rice,et al.  CONDITIONS FOR THE LOCALIZATION OF DEFORMATION IN PRESSURE-SENSITIVE DILATANT MATERIALS , 1975 .

[22]  Tomasz Hueckel,et al.  Reactive plasticity for clays during dehydration and rehydration. Part 1: concepts and options , 2002 .

[23]  Jean-Pierre Bardet,et al.  A comprehensive review of strain localization in elastoplastic soils. , 1990 .

[24]  M. J. Hvorslev.  PHYSICAL COMPONENTS OF THE SHEAR STRENGTH OF SATURATED CLAYS , 1960 .

[25]  P. W. Rowe,et al.  Importance of Free Ends in Triaxial Testing , 1964 .