Journal Published Online: 25 August 2017
Volume 40, Issue 5

Experimental Study on Use of Internal and External Drains in Triaxial Tests



Triaxial tests require a relatively long period of time for consolidation, especially on fine-grained soil. To accelerate the consolidation process, external filter paper strips have often been used in practice. This paper examines and evaluates use of an internal yarn drain technique, compared to the traditional filter paper technique in triaxial testing. The experiments employed seven drainage configurations, either with internal drains, with external filter strips, or with no drains or filter strips at all. The effectiveness was first evaluated in both isotropic and anisotropic consolidation stages of the triaxial tests. Undrained compression loading was then performed to examine the effects of the internal and external drains on shear behavior. The internal drains showed excellent potential for shortening the consolidation time, as did external filter paper. However, the relative effectiveness depends on the type of the soil among the three clays tested in this paper. The effect of the potential disturbance from the insertion of the internal drains may be less than the disturbance due to different sampling methods.

Author Information

Suzuki, Yusuke
Norwegian Geotechnical Institute, Ullevaal Stadion, Olso, Norway
Dyvik, Rune
Norwegian Geotechnical Institute, Olso, Norway
Schmertmann, John H.
University of Florida, Gainesville, FL
Pages: 12
Price: $25.00
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Stock #: GTJ20160266
ISSN: 0149-6115
DOI: 10.1520/GTJ20160266