The Danish Rigid Boundary True Triaxial Apparatus for Soil Testing
Ibsen LB, Praastrup U
(Received 10 August 2000; accepted 28 September 2001)

Abstract
The intermediate principal stress plays an important role for the stress-strain behavior of soils. The effect of the intermediate stress cannot be examined in the conventional triaxial apparatus since axisymmetric stress states are prescribed in it. Thus, other testing devices capable of producing asymmetric stress states are necessary for more accurate determination of the stress-strain behavior. This paper describes the Danish rigid boundary true triaxial apparatus developed at Aalborg University and the techniques employed to prepare and test specimens of clay and sand for effects of the intermediate stress. Three series of true triaxial tests are presented together with various conventional triaxial tests to illustrate the capabilities of the apparatus. The first series of tests was carried out on cross-anisotropic specimens from a natural clay deposit. The other two series were carried out on air-pluviated (frozen and unfrozen) specimens of sand that also showed cross-anisotropic behavior.

Keywords:
clay, cross-anisotropy, sand, stress-strain behavior corrections, triaxial testing, triaxial tests, true triaxial tests

Paper ID: GTJ20029882_253

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Author Ibsen LB, Praastrup U Title The Danish Rigid Boundary True Triaxial Apparatus for Soil Testing Symposium , Committee on