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Geological Society, London, Special Publications; 2003; v. 215; p. 191-198;
DOI: 10.1144/GSL.SP.2003.215.01.17
© 2003 Geological Society of London

Monitoring void ratio redistribution during continuous undrained triaxial compression by X-ray computed tomography

P. R. Thomson & R. C. K. Wong

Department of Civil Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada rckwong{at}ucalgary.ca

It is usually implied that void ratio of a soil specimen is homogeneous and unchanging during an undrained triaxial test. In this study, X-ray computed tomography was used to measure void ratio redistribution during undrained triaxial compression of a cohesionless soil sample. A specially designed triaxial apparatus was used to scan the same sample at different axial strain levels, while the axial loads and confining pressures were maintained. Significant variation in sample void ratio was observed at the end of consolidation and sample uniformity was found to increase with increasing axial strain. The process of void ratio redistribution can be effectively illustrated in void ratio-effective stress space.