Triaxial Testing of Unsaturated Soils

  • E. C. Leong
  • T. T. Nyunt
  • H. Rahardjo
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG)


This paper highlights the key features of triaxial testing of unsaturated soils. The modifications to a conventional triaxial apparatus and the test procedures for various unsaturated soil triaxial tests are described. Test results for an undisturbed residual soil tested under consolidated undrained (CU) and constant water content (CW) conditions at three different strain rates are presented. The test results showed that φ b is not a constant, but decreases as matric suction is increased. The shear strength envelopes obtained from CU and CW tests at the three different strain rates are similar.


Triaxial Test Unsaturated Soil Residual Soil Matric Suction Soil Specimen 
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© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.School of Civil & Environmental EngineeringNanyang Technological UniversityNanyangSingapore

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