Liquefaction Resistance of Sandy Soils under Partially Drained Condition
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 135, Issue 8
Abstract
In order to simulate the effect of drainage on soils adjacent to gravel drains that are installed as countermeasure against liquefaction, several series of cyclic triaxial tests were performed on saturated sands under partially drained conditions. The condition of partial drainage under cyclic loading was simulated in the laboratory using triaxial testing equipment installed with a drainage control valve to precisely regulate the volume of water being drained from test specimens. Effects of both drainage conditions and loading frequencies on cyclic response were incorporated through the coefficient of drainage effect, . Experimental results showed that for sand exhibiting strain softening, the partially drained response was controlled by the critical effective stress ratio while for sand showing strain hardening behavior, the controlling factor was the phase transformation stress ratio. Moreover, test results indicated that the minimum liquefaction resistance under partially drained conditions can be used as a parameter to describe the liquefaction resistance of sands improved by the gravel drain method. From these results, a simplified procedure for designing gravel drains based on the factor of safety concept was proposed.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 135 • Issue 8 • August 2009
Pages: 1032 - 1043
Copyright
© 2009 ASCE.
History
Received: May 1, 2008
Accepted: Dec 10, 2008
Published online: Feb 23, 2009
Published in print: Aug 2009
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