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Document Type

Research

Abstract

Determination of the effect of the slenderness ratio on the results of the triaxial test depends, theoretically, on the boundary conditions induced by (a) shape of the test specimen, (b) manner of the transmission of the external load, and (c) deformations. From a practical point of view enough length should be available to develop two complete cones of failure and the length of the specimen should equal the diameter times the tangent of (45 +ø/2) °. Most workers in the field of triaxial testing of soils accept a slenderness ratio of from 1.5 to 3.0. With slenderness ratios greater than 3, there is a danger of side buckling. With ratios less than 1.5, the whole sample is restrained by the friction of the end loading plates. A 1:5 ratio of particle size to specimen diameter has been developed for sands and may also be applicable to gravels. In the field of bituminous testing a 1: 2 ratio has been found to give sufficient accuracy and a reproducibility for most design and control purposes. An elastic analysis of the triaxial shear test indicates that the absolute dimensions of the cylinder are of no significance and that the stresses depend only on the slenderness ratio. However, experience in the laboratory indicates that the results on the same material with equipment of various dimensions may be quite diverse.

Publication Date

1966

Journal Title

Proceedings of the Iowa Academy of Science

Volume

73

Issue

1

First Page

285

Last Page

292

Copyright

© Copyright 1966 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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