Strain Conditions in Compression Cylinder

by William M. Kirkpatrick, (M.ASCE), Sr. Lect.; Dept. of Civ. Engrg., Univ. of Strathclyde, Glasgow, Scotland,
J. Scott Younger, (A.M.ASCE), Lectuer; Dept. of Civ. Engrg., Univ. of Strathclyde, Glasgow, Scotland,

Serial Information: Journal of the Soil Mechanics and Foundations Division, 1970, Vol. 96, Issue 5, Pg. 1683-1695

Document Type: Journal Paper


Drained compression tests have been performed on large diameter triaxial samples of sand in which the internal deformations have been observed. These deformations and therefore the pattern of strain within the sample were estimated from the displacements of lead shot measured using an X-ray technique. Particular attention is given to axial strains, which have been measured using both lubricated and rough platens to give the limiting conditions of end restraint on samples having a range of length to diameter ratios. The data show that homogeneous strain states develop in samples tested using end lubrication, the internal strains being close in value to those measured at the sample boundaries. Samples tested using rough platens, on the other hand, develop nonuniform distributions of deformation to such a severe extent that it is considered that reliable stress-strain information cannot be provided by this method of testing.

Subject Headings: Compression tests | Triaxial tests | Soil deformation | Strain | Compression | Cylinders | Soil compression | Axial forces

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