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Determination of Critical State Parameters in Sandy Soils from Standard Triaxial Testing (II) : Experiment and Recommendation  

조계춘 (Civil & Environmental Engrg., KAIST)
Publication Information
Journal of the Korean Geotechnical Society / v.19, no.1, 2003 , pp. 77-92 More about this Journal
Abstract
A set of standard triaxial testing was performed to identify underlying physical processes and inherent limitations in the determination of critical state parameters in sandy soils. The experimental test results showed that the critical state friction angle for a given soil is constant regardless of drainage condition while the critical state line on the e-log p'space is significantly affected by drainage condition mainly because of insufficient strain attained in standard triaxial tests and strain localization effects in udrained tests. It appeared that the best method to determine critical state parameters in laboratory testing is to use homogeneous loose specimens under drained shear condition. In addition, a reference state parameter was suggested to design tests that will avoid dilatancy or strain localization effects in drained tests.
Keywords
Critical state; Critical state parameters; Friction angle; Post-liquefaction; Sandy soil; Strain localization; Shear strength; Standard triaxial test;
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