Journal Published Online: 12 May 2017
Volume 40, Issue 4

Behavior of a Sensitive Clay in Isotropically Consolidated -Drained Triaxial Tests



This paper presented experimental results obtained in isotropically consolidated o-drained triaxial tests on a lightly overconsolidated sensitive clay from Louiseville (Quebec). For the tests that start near the origin, the results showed that the response of the structured clay can be divided into three distinct phases of deformation. At low mean effective stress levels, the value of o ranged between 0.2 and 0.3, and the shear stress varied linearly with strain. A critical shear stress was reached at the end of the first phase of deformation. At intermediate stress levels, the clay behaved like a plastic material, with o = 0 and the shear stress remained approximately constant during deformation. At high stress levels, the clay becomes normally consolidated with o = 1 − sin ϕ′, where ϕ′ is the friction angle of the destructured clay. However, the clay does not become normally consolidated for vertical effective stresses just in excess of the vertical preconsolidation pressure σ′vp. Rather, the effective vertical stress must exceed 1.36 σ′vp for the clay to reach a normally consolidated state. Comparisons were made with test results obtained on other sensitive clays of Eastern Canada, which showed a response similar to that of Louiseville clay.

Author Information

Silvestri, V.
Dept. of Civil, Geological, and Mining Engineering, Ecole Polytechnique, Montréal, CA
Abou-Samra, G.
Dept. of Civil Engineering, Univ. of Moncton, Moncton, CA
Pages: 17
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Stock #: GTJ20160159
ISSN: 0149-6115
DOI: 10.1520/GTJ20160159